From: Ben Boeckel <ben.boeckel@kitware.com>
To: gcc-patches@gcc.gnu.org
Cc: Ben Boeckel <ben.boeckel@kitware.com>,
jason@redhat.com, nathan@acm.org, fortran@gcc.gnu.org,
gcc@gcc.gnu.org, brad.king@kitware.com
Subject: [PATCH v8 2/4] p1689r5: initial support
Date: Fri, 1 Sep 2023 09:04:02 -0400 [thread overview]
Message-ID: <20230901130407.259768-3-ben.boeckel@kitware.com> (raw)
In-Reply-To: <20230901130407.259768-1-ben.boeckel@kitware.com>
This patch implements support for [P1689R5][] to communicate to a build
system the C++20 module dependencies to build systems so that they may
build `.gcm` files in the proper order.
Support is communicated through the following three new flags:
- `-fdeps-format=` specifies the format for the output. Currently named
`p1689r5`.
- `-fdeps-file=` specifies the path to the file to write the format to.
- `-fdeps-target=` specifies the `.o` that will be written for the TU
that is scanned. This is required so that the build system can
correlate the dependency output with the actual compilation that will
occur.
CMake supports this format as of 17 Jun 2022 (to be part of 3.25.0)
using an experimental feature selection (to allow for future usage
evolution without committing to how it works today). While it remains
experimental, docs may be found in CMake's documentation for
experimental features.
Future work may include using this format for Fortran module
dependencies as well, however this is still pending work.
[P1689R5]: https://isocpp.org/files/papers/P1689R5.html
[cmake-experimental]: https://gitlab.kitware.com/cmake/cmake/-/blob/master/Help/dev/experimental.rst
TODO:
- header-unit information fields
Header units (including the standard library headers) are 100%
unsupported right now because the `-E` mechanism wants to import their
BMIs. A new mode (i.e., something more workable than existing `-E`
behavior) that mocks up header units as if they were imported purely
from their path and content would be required.
- non-utf8 paths
The current standard says that paths that are not unambiguously
represented using UTF-8 are not supported (because these cases are rare
and the extra complication is not worth it at this time). Future
versions of the format might have ways of encoding non-UTF-8 paths. For
now, this patch just doesn't support non-UTF-8 paths (ignoring the
"unambiguously representable in UTF-8" case).
- figure out why junk gets placed at the end of the file
Sometimes it seems like the file gets a lot of `NUL` bytes appended to
it. It happens rarely and seems to be the result of some
`ftruncate`-style call which results in extra padding in the contents.
Noting it here as an observation at least.
libcpp/
* include/cpplib.h: Add cpp_fdeps_format enum.
(cpp_options): Add fdeps_format field
(cpp_finish): Add structured dependency fdeps_stream parameter.
* include/mkdeps.h (deps_add_module_target): Add flag for
whether a module is exported or not.
(fdeps_add_target): Add function.
(deps_write_p1689r5): Add function.
* init.cc (cpp_finish): Add new preprocessor parameter used for C++
module tracking.
* mkdeps.cc (mkdeps): Implement P1689R5 output.
gcc/
* doc/invoke.texi: Document -fdeps-format=, -fdeps-file=, and
-fdeps-target= flags.
* gcc.cc: add defaults for -fdeps-target= and -fdeps-file= when
only -fdeps-format= is specified.
* json.h: Add a TODO item to refactor out to share with
`libcpp/mkdeps.cc`.
gcc/c-family/
* c-opts.cc (c_common_handle_option): Add fdeps_file variable and
-fdeps-format=, -fdeps-file=, and -fdeps-target= parsing.
* c.opt: Add -fdeps-format=, -fdeps-file=, and -fdeps-target=
flags.
gcc/cp/
* module.cc (preprocessed_module): Pass whether the module is
exported to dependency tracking.
gcc/testsuite/
* g++.dg/modules/depflags-f-MD.C: New test.
* g++.dg/modules/depflags-f.C: New test.
* g++.dg/modules/depflags-fi.C: New test.
* g++.dg/modules/depflags-fj-MD.C: New test.
* g++.dg/modules/depflags-fj.C: New test.
* g++.dg/modules/depflags-fjo-MD.C: New test.
* g++.dg/modules/depflags-fjo.C: New test.
* g++.dg/modules/depflags-fo-MD.C: New test.
* g++.dg/modules/depflags-fo.C: New test.
* g++.dg/modules/depflags-j-MD.C: New test.
* g++.dg/modules/depflags-j.C: New test.
* g++.dg/modules/depflags-jo-MD.C: New test.
* g++.dg/modules/depflags-jo.C: New test.
* g++.dg/modules/depflags-o-MD.C: New test.
* g++.dg/modules/depflags-o.C: New test.
* g++.dg/modules/p1689-1.C: New test.
* g++.dg/modules/p1689-1.exp.ddi: New test expectation.
* g++.dg/modules/p1689-2.C: New test.
* g++.dg/modules/p1689-2.exp.ddi: New test expectation.
* g++.dg/modules/p1689-3.C: New test.
* g++.dg/modules/p1689-3.exp.ddi: New test expectation.
* g++.dg/modules/p1689-4.C: New test.
* g++.dg/modules/p1689-4.exp.ddi: New test expectation.
* g++.dg/modules/p1689-5.C: New test.
* g++.dg/modules/p1689-5.exp.ddi: New test expectation.
* g++.dg/modules/modules.exp: Load new P1689 library routines.
* g++.dg/modules/test-p1689.py: New tool for validating P1689 output.
* lib/modules.exp: Support for validating P1689 outputs.
Signed-off-by: Ben Boeckel <ben.boeckel@kitware.com>
---
gcc/c-family/c-opts.cc | 44 +++-
gcc/c-family/c.opt | 12 +
gcc/cp/module.cc | 3 +-
gcc/doc/invoke.texi | 27 +++
gcc/gcc.cc | 4 +-
gcc/json.h | 3 +
gcc/testsuite/g++.dg/modules/depflags-f-MD.C | 2 +
gcc/testsuite/g++.dg/modules/depflags-f.C | 3 +
gcc/testsuite/g++.dg/modules/depflags-fi.C | 4 +
gcc/testsuite/g++.dg/modules/depflags-fj-MD.C | 3 +
.../g++.dg/modules/depflags-fj-MF-share.C | 6 +
gcc/testsuite/g++.dg/modules/depflags-fj.C | 4 +
.../g++.dg/modules/depflags-fjo-MD.C | 4 +
gcc/testsuite/g++.dg/modules/depflags-fjo.C | 5 +
gcc/testsuite/g++.dg/modules/depflags-fo-MD.C | 3 +
gcc/testsuite/g++.dg/modules/depflags-fo.C | 4 +
gcc/testsuite/g++.dg/modules/depflags-j-MD.C | 2 +
gcc/testsuite/g++.dg/modules/depflags-j.C | 3 +
gcc/testsuite/g++.dg/modules/depflags-jo-MD.C | 3 +
gcc/testsuite/g++.dg/modules/depflags-jo.C | 4 +
gcc/testsuite/g++.dg/modules/depflags-o-MD.C | 2 +
gcc/testsuite/g++.dg/modules/depflags-o.C | 3 +
gcc/testsuite/g++.dg/modules/modules.exp | 1 +
gcc/testsuite/g++.dg/modules/p1689-1.C | 17 ++
gcc/testsuite/g++.dg/modules/p1689-1.exp.ddi | 27 +++
gcc/testsuite/g++.dg/modules/p1689-2.C | 15 ++
gcc/testsuite/g++.dg/modules/p1689-2.exp.ddi | 16 ++
gcc/testsuite/g++.dg/modules/p1689-3.C | 13 +
gcc/testsuite/g++.dg/modules/p1689-3.exp.ddi | 16 ++
gcc/testsuite/g++.dg/modules/p1689-4.C | 13 +
gcc/testsuite/g++.dg/modules/p1689-4.exp.ddi | 14 ++
gcc/testsuite/g++.dg/modules/p1689-5.C | 13 +
gcc/testsuite/g++.dg/modules/p1689-5.exp.ddi | 14 ++
.../g++.dg/modules/p1689-file-default.C | 16 ++
.../g++.dg/modules/p1689-file-default.exp.ddi | 27 +++
.../g++.dg/modules/p1689-target-default.C | 16 ++
.../modules/p1689-target-default.exp.ddi | 27 +++
gcc/testsuite/g++.dg/modules/test-p1689.py | 222 ++++++++++++++++++
gcc/testsuite/lib/modules.exp | 71 ++++++
libcpp/include/cpplib.h | 12 +-
libcpp/include/mkdeps.h | 9 +-
libcpp/init.cc | 13 +-
libcpp/mkdeps.cc | 163 ++++++++++++-
43 files changed, 869 insertions(+), 14 deletions(-)
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-f-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-f.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fi.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fj-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fj-MF-share.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fj.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fjo-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fjo.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fo-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-fo.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-j-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-j.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-jo-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-jo.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-o-MD.C
create mode 100644 gcc/testsuite/g++.dg/modules/depflags-o.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-1.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-1.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-2.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-2.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-3.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-3.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-4.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-4.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-5.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-5.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-file-default.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-file-default.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-target-default.C
create mode 100644 gcc/testsuite/g++.dg/modules/p1689-target-default.exp.ddi
create mode 100644 gcc/testsuite/g++.dg/modules/test-p1689.py
create mode 100644 gcc/testsuite/lib/modules.exp
diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index 4961af63de8..1c1f8c84f88 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -77,6 +77,9 @@ static bool verbose;
/* Dependency output file. */
static const char *deps_file;
+/* Structured dependency output file. */
+static const char *fdeps_file;
+
/* The prefix given by -iprefix, if any. */
static const char *iprefix;
@@ -361,6 +364,24 @@ c_common_handle_option (size_t scode, const char *arg, HOST_WIDE_INT value,
deps_file = arg;
break;
+ case OPT_fdeps_format_:
+ /* https://wg21.link/p1689r5 */
+ if (!strcmp (arg, "p1689r5"))
+ cpp_opts->deps.fdeps_format = FDEPS_FMT_P1689R5;
+ else
+ error ("%<-fdeps-format=%> unknown format %<%s%>", arg);
+ break;
+
+ case OPT_fdeps_file_:
+ deps_seen = true;
+ fdeps_file = arg;
+ break;
+
+ case OPT_fdeps_target_:
+ deps_seen = true;
+ defer_opt (code, arg);
+ break;
+
case OPT_MF:
deps_seen = true;
deps_file = arg;
@@ -1281,6 +1302,7 @@ void
c_common_finish (void)
{
FILE *deps_stream = NULL;
+ FILE *fdeps_stream = NULL;
/* Note that we write the dependencies even if there are errors. This is
useful for handling outdated generated headers that now trigger errors
@@ -1309,9 +1331,27 @@ c_common_finish (void)
locations with input_location, which would be incorrect now. */
override_libcpp_locations = false;
+ if (cpp_opts->deps.fdeps_format != FDEPS_FMT_NONE)
+ {
+ if (!fdeps_file)
+ fdeps_stream = out_stream;
+ else if (fdeps_file[0] == '-' && fdeps_file[1] == '\0')
+ fdeps_stream = stdout;
+ else
+ {
+ fdeps_stream = fopen (fdeps_file, "w");
+ if (!fdeps_stream)
+ fatal_error (input_location, "opening dependency file %s: %m",
+ fdeps_file);
+ }
+ if (fdeps_stream == deps_stream && fdeps_stream != stdout)
+ fatal_error (input_location, "%<-MF%> and %<-fdeps-file=%> cannot share an output file %s: %m",
+ fdeps_file);
+ }
+
/* For performance, avoid tearing down cpplib's internal structures
with cpp_destroy (). */
- cpp_finish (parse_in, deps_stream);
+ cpp_finish (parse_in, deps_stream, fdeps_stream);
if (deps_stream && deps_stream != out_stream && deps_stream != stdout
&& (ferror (deps_stream) || fclose (deps_stream)))
@@ -1383,6 +1423,8 @@ handle_deferred_opts (void)
if (opt->code == OPT_MT || opt->code == OPT_MQ)
deps_add_target (deps, opt->arg, opt->code == OPT_MQ);
+ else if (opt->code == OPT_fdeps_target_)
+ fdeps_add_target (deps, opt->arg, true);
}
}
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index c7b567ba7ab..982d5360ca1 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -256,6 +256,18 @@ MT
C ObjC C++ ObjC++ Joined Separate MissingArgError(missing makefile target after %qs)
-MT <target> Add a target that does not require quoting.
+fdeps-format=
+C ObjC C++ ObjC++ NoDriverArg Joined MissingArgError(missing format after %qs)
+Structured format for output dependency information. Supported (\"p1689r5\").
+
+fdeps-file=
+C ObjC C++ ObjC++ NoDriverArg Joined MissingArgError(missing output path after %qs)
+File for output dependency information.
+
+fdeps-target=
+C ObjC C++ ObjC++ NoDriverArg Joined MissingArgError(missing path after %qs)
+-fdeps-target=obj.o Output file for the compile step.
+
P
C ObjC C++ ObjC++
Do not generate #line directives.
diff --git a/gcc/cp/module.cc b/gcc/cp/module.cc
index ea362bdffa4..9df60d695b1 100644
--- a/gcc/cp/module.cc
+++ b/gcc/cp/module.cc
@@ -19834,7 +19834,8 @@ preprocessed_module (cpp_reader *reader)
&& (module->is_interface () || module->is_partition ()))
deps_add_module_target (deps, module->get_flatname (),
maybe_add_cmi_prefix (module->filename),
- module->is_header());
+ module->is_header (),
+ module->is_exported ());
else
deps_add_module_dep (deps, module->get_flatname ());
}
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 10f3466052f..bad0c9218af 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -2824,6 +2824,33 @@ is @option{-fpermitted-flt-eval-methods=c11}. The default when in a GNU
dialect (@option{-std=gnu11} or similar) is
@option{-fpermitted-flt-eval-methods=ts-18661-3}.
+@opindex fdeps-
+The @samp{-fdeps-*} options are used to extract structured dependency
+information for a source. This involves determining what resources provided by
+other source files will be required to compile the source as well as what
+resources are provided by the source. This information can be used to add
+required dependencies between compilation rules of dependent sources based on
+their contents rather than requiring such information be reflected within the
+build tools as well.
+
+@opindex fdeps-file
+@item -fdeps-file=@var{file}
+Where to write structured dependency information.
+
+@opindex fdeps-format
+@item -fdeps-format=@var{format}
+The format to use for structured dependency information. @samp{p1689r5} is the
+only supported format right now. Note that when this argument is specified, the
+output of @samp{-MF} is stripped of some information (namely C++ modules) so
+that it does not use extended makefile syntax not understood by most tools.
+
+@opindex fdeps-target
+@item -fdeps-target=@var{file}
+Analogous to @option{-MT} but for structured dependency information. This
+indicates the target which will ultimately need any required resources and
+provide any resources extracted from the source that may be required by other
+sources.
+
@opindex fplan9-extensions
@item -fplan9-extensions
Accept some non-standard constructs used in Plan 9 code.
diff --git a/gcc/gcc.cc b/gcc/gcc.cc
index 4c4e81dee50..76e16749e92 100644
--- a/gcc/gcc.cc
+++ b/gcc/gcc.cc
@@ -1236,7 +1236,9 @@ static const char *cpp_unique_options =
%{remap} %{%:debug-level-gt(2):-dD}\
%{!iplugindir*:%{fplugin*:%:find-plugindir()}}\
%{H} %C %{D*&U*&A*} %{i*} %Z %i\
- %{E|M|MM:%W{o*}}";
+ %{E|M|MM:%W{o*}}\
+ %{fdeps-format=*:%{!fdeps-file=*:-fdeps-file=%:join(%{!o:%b.ddi}%{o*:%.ddi%*})}}\
+ %{fdeps-format=*:%{!fdeps-target=*:-fdeps-target=%:join(%{!o:%b.o}%{o*:%.o%*})}}";
/* This contains cpp options which are common with cc1_options and are passed
only when preprocessing only to avoid duplication. We pass the cc1 spec
diff --git a/gcc/json.h b/gcc/json.h
index 057119db277..6cc58c8ae0c 100644
--- a/gcc/json.h
+++ b/gcc/json.h
@@ -30,6 +30,9 @@ along with GCC; see the file COPYING3. If not see
Supports creating a DOM-like tree of json::value *, and then dumping
json::value * to text. */
+/* TODO: `libcpp/mkdeps.cc` wants JSON writing support for p1689r5 output;
+ extract this code and move to libiberty. */
+
namespace json
{
diff --git a/gcc/testsuite/g++.dg/modules/depflags-f-MD.C b/gcc/testsuite/g++.dg/modules/depflags-f-MD.C
new file mode 100644
index 00000000000..2bd980c0047
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-f-MD.C
@@ -0,0 +1,2 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-format=p1689r5 }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-f.C b/gcc/testsuite/g++.dg/modules/depflags-f.C
new file mode 100644
index 00000000000..789b18f59e4
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-f.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -fdeps-format=p1689r5 }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fi.C b/gcc/testsuite/g++.dg/modules/depflags-fi.C
new file mode 100644
index 00000000000..d8e75ad9089
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fi.C
@@ -0,0 +1,4 @@
+// { dg-additional-options -fdeps-format=invalid }
+
+// { dg-prune-output "error: '-fdeps-format=' unknown format 'invalid'" }
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fj-MD.C b/gcc/testsuite/g++.dg/modules/depflags-fj-MD.C
new file mode 100644
index 00000000000..3a9452345a8
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fj-MD.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-format=p1689r5 }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fj-MF-share.C b/gcc/testsuite/g++.dg/modules/depflags-fj-MF-share.C
new file mode 100644
index 00000000000..723014f7a0e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fj-MF-share.C
@@ -0,0 +1,6 @@
+// { dg-additional-options -MD }
+// { dg-additional-options "-MF depflags-3.ddi" }
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-format=p1689r5 }
+
+// { dg-prune-output "error: '-MF' and '-fdeps-file=' cannot share an output file" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fj.C b/gcc/testsuite/g++.dg/modules/depflags-fj.C
new file mode 100644
index 00000000000..063e0ee5514
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fj.C
@@ -0,0 +1,4 @@
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-format=p1689r5 }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fjo-MD.C b/gcc/testsuite/g++.dg/modules/depflags-fjo-MD.C
new file mode 100644
index 00000000000..84da337f9f6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fjo-MD.C
@@ -0,0 +1,4 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-target=depflags-1.C }
+// { dg-additional-options -fdeps-format=p1689r5 }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fjo.C b/gcc/testsuite/g++.dg/modules/depflags-fjo.C
new file mode 100644
index 00000000000..760d8f26f66
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fjo.C
@@ -0,0 +1,5 @@
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-target=depflags-1.C }
+// { dg-additional-options -fdeps-format=p1689r5 }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fo-MD.C b/gcc/testsuite/g++.dg/modules/depflags-fo-MD.C
new file mode 100644
index 00000000000..6da03f9133f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fo-MD.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=depflags-1.C }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-fo.C b/gcc/testsuite/g++.dg/modules/depflags-fo.C
new file mode 100644
index 00000000000..5deb27a4598
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-fo.C
@@ -0,0 +1,4 @@
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=depflags-1.C }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-j-MD.C b/gcc/testsuite/g++.dg/modules/depflags-j-MD.C
new file mode 100644
index 00000000000..92a2af61e78
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-j-MD.C
@@ -0,0 +1,2 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-j.C b/gcc/testsuite/g++.dg/modules/depflags-j.C
new file mode 100644
index 00000000000..2eb5890938e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-j.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-jo-MD.C b/gcc/testsuite/g++.dg/modules/depflags-jo-MD.C
new file mode 100644
index 00000000000..ba2b21e3066
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-jo-MD.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-target=depflags-1.C }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-jo.C b/gcc/testsuite/g++.dg/modules/depflags-jo.C
new file mode 100644
index 00000000000..a015d35141f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-jo.C
@@ -0,0 +1,4 @@
+// { dg-additional-options -fdeps-file=depflags-3.ddi }
+// { dg-additional-options -fdeps-target=depflags-1.C }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-o-MD.C b/gcc/testsuite/g++.dg/modules/depflags-o-MD.C
new file mode 100644
index 00000000000..1b67558b687
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-o-MD.C
@@ -0,0 +1,2 @@
+// { dg-additional-options -MD }
+// { dg-additional-options -fdeps-target=depflags-1.C }
diff --git a/gcc/testsuite/g++.dg/modules/depflags-o.C b/gcc/testsuite/g++.dg/modules/depflags-o.C
new file mode 100644
index 00000000000..38d645081b6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/depflags-o.C
@@ -0,0 +1,3 @@
+// { dg-additional-options -fdeps-target=depflags-1.C }
+
+// { dg-prune-output "error: to generate dependencies you must specify either '-M' or '-MM'" }
diff --git a/gcc/testsuite/g++.dg/modules/modules.exp b/gcc/testsuite/g++.dg/modules/modules.exp
index dc302d3d0af..b6929544c59 100644
--- a/gcc/testsuite/g++.dg/modules/modules.exp
+++ b/gcc/testsuite/g++.dg/modules/modules.exp
@@ -28,6 +28,7 @@
# { dg-module-do [link|run] [xfail] [options] } # link [and run]
load_lib g++-dg.exp
+load_lib modules.exp
# If a testcase doesn't have special options, use these.
global DEFAULT_CXXFLAGS
diff --git a/gcc/testsuite/g++.dg/modules/p1689-1.C b/gcc/testsuite/g++.dg/modules/p1689-1.C
new file mode 100644
index 00000000000..3c138c8f82e
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-1.C
@@ -0,0 +1,17 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-1.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-1.o }
+// { dg-additional-options -fdeps-file=p1689-1.ddi }
+
+// Export a module that uses modules, re-exports modules, and partitions.
+
+export module foo;
+export import foo:part1;
+import foo:part2;
+
+export import bar;
+
+// { dg-final { run-check-p1689-valid p1689-1.ddi p1689-1.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-1.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-1.exp.ddi
new file mode 100644
index 00000000000..c5648ac7ae5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-1.exp.ddi
@@ -0,0 +1,27 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-1.o",
+ "provides": [
+ {
+ "logical-name": "foo",
+ "is-interface": true
+ }
+ ],
+ "requires": [
+ "__P1689_unordered__",
+ {
+ "logical-name": "bar"
+ },
+ {
+ "logical-name": "foo:part1"
+ },
+ {
+ "logical-name": "foo:part2"
+ }
+ ]
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-2.C b/gcc/testsuite/g++.dg/modules/p1689-2.C
new file mode 100644
index 00000000000..5d7fe52a809
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-2.C
@@ -0,0 +1,15 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-2.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-2.o }
+// { dg-additional-options -fdeps-file=p1689-2.ddi }
+
+// Export a module partition that uses modules.
+
+export module foo:part1;
+
+#include <iostream>
+
+// { dg-final { run-check-p1689-valid p1689-2.ddi p1689-2.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-2.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-2.exp.ddi
new file mode 100644
index 00000000000..6901172f277
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-2.exp.ddi
@@ -0,0 +1,16 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-2.o",
+ "provides": [
+ {
+ "logical-name": "foo:part1",
+ "is-interface": true
+ }
+ ],
+ "requires": []
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-3.C b/gcc/testsuite/g++.dg/modules/p1689-3.C
new file mode 100644
index 00000000000..6c0aced5419
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-3.C
@@ -0,0 +1,13 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-3.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-3.o }
+// { dg-additional-options -fdeps-file=p1689-3.ddi }
+
+// Provide a module partition.
+
+module foo:part2;
+
+// { dg-final { run-check-p1689-valid p1689-3.ddi p1689-3.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-3.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-3.exp.ddi
new file mode 100644
index 00000000000..5a40beacd22
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-3.exp.ddi
@@ -0,0 +1,16 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-3.o",
+ "provides": [
+ {
+ "logical-name": "foo:part2",
+ "is-interface": false
+ }
+ ],
+ "requires": []
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-4.C b/gcc/testsuite/g++.dg/modules/p1689-4.C
new file mode 100644
index 00000000000..922f0158440
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-4.C
@@ -0,0 +1,13 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-4.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-4.o }
+// { dg-additional-options -fdeps-file=p1689-4.ddi }
+
+// Module implementation unit.
+
+module foo;
+
+// { dg-final { run-check-p1689-valid p1689-4.ddi p1689-4.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-4.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-4.exp.ddi
new file mode 100644
index 00000000000..b119f5654b1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-4.exp.ddi
@@ -0,0 +1,14 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-4.o",
+ "requires": []
+ {
+ "logical-name": "foo"
+ }
+ ]
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-5.C b/gcc/testsuite/g++.dg/modules/p1689-5.C
new file mode 100644
index 00000000000..94908bf8a03
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-5.C
@@ -0,0 +1,13 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-5.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-5.o }
+// { dg-additional-options -fdeps-file=p1689-5.ddi }
+
+// Use modules, don't provide anything.
+
+import bar;
+
+// { dg-final { run-check-p1689-valid p1689-5.ddi p1689-5.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-5.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-5.exp.ddi
new file mode 100644
index 00000000000..18704ac8820
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-5.exp.ddi
@@ -0,0 +1,14 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-5.o",
+ "requires": [
+ {
+ "logical-name": "bar"
+ }
+ ]
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-file-default.C b/gcc/testsuite/g++.dg/modules/p1689-file-default.C
new file mode 100644
index 00000000000..4e1f5bbd2f7
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-file-default.C
@@ -0,0 +1,16 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-file-default.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-target=p1689-file-default.o }
+
+// Scan without `-fdeps-file=`
+
+export module foo;
+export import foo:part1;
+import foo:part2;
+
+export import bar;
+
+// { dg-final { run-check-p1689-valid p1689-file-default.o.ddi p1689-file-default.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-file-default.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-file-default.exp.ddi
new file mode 100644
index 00000000000..187eab6141a
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-file-default.exp.ddi
@@ -0,0 +1,27 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-file-default.o",
+ "provides": [
+ {
+ "logical-name": "foo",
+ "is-interface": true
+ }
+ ],
+ "requires": [
+ "__P1689_unordered__",
+ {
+ "logical-name": "bar"
+ },
+ {
+ "logical-name": "foo:part1"
+ },
+ {
+ "logical-name": "foo:part2"
+ }
+ ]
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/p1689-target-default.C b/gcc/testsuite/g++.dg/modules/p1689-target-default.C
new file mode 100644
index 00000000000..67088ed2769
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-target-default.C
@@ -0,0 +1,16 @@
+// { dg-additional-options -E }
+// { dg-additional-options "-MT p1689-target-default.ddi" }
+// { dg-additional-options -MD }
+// { dg-additional-options -fmodules-ts }
+// { dg-additional-options -fdeps-format=p1689r5 }
+// { dg-additional-options -fdeps-file=p1689-target-default.ddi }
+
+// Scan without `-fdeps-target=`
+
+export module foo;
+export import foo:part1;
+import foo:part2;
+
+export import bar;
+
+// { dg-final { run-check-p1689-valid p1689-target-default.ddi p1689-target-default.exp.ddi } }
diff --git a/gcc/testsuite/g++.dg/modules/p1689-target-default.exp.ddi b/gcc/testsuite/g++.dg/modules/p1689-target-default.exp.ddi
new file mode 100644
index 00000000000..dd3d9c44705
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/p1689-target-default.exp.ddi
@@ -0,0 +1,27 @@
+{
+ "rules": [
+ {
+ "primary-output": "p1689-target-default.o",
+ "provides": [
+ {
+ "logical-name": "foo",
+ "is-interface": true
+ }
+ ],
+ "requires": [
+ "__P1689_unordered__",
+ {
+ "logical-name": "bar"
+ },
+ {
+ "logical-name": "foo:part1"
+ },
+ {
+ "logical-name": "foo:part2"
+ }
+ ]
+ }
+ ],
+ "version": 0,
+ "revision": 0
+}
diff --git a/gcc/testsuite/g++.dg/modules/test-p1689.py b/gcc/testsuite/g++.dg/modules/test-p1689.py
new file mode 100644
index 00000000000..2f07cc361aa
--- /dev/null
+++ b/gcc/testsuite/g++.dg/modules/test-p1689.py
@@ -0,0 +1,222 @@
+import json
+
+
+# Parameters.
+ALL_ERRORS = False
+REPLACEMENTS = {}
+
+
+def _print_path(path):
+ '''Format a JSON path for output.'''
+ return '/'.join(path)
+
+
+def _report_error(msg):
+ '''Report an error.'''
+ full_msg = 'ERROR: ' + msg
+ if ALL_ERRORS:
+ print(full_msg)
+ else:
+ raise RuntimeError(full_msg)
+
+
+def _error_type_mismatch(path, actual, expect):
+ '''Report that there is a type mismatch.'''
+ _report_error('type mismatch at %s: actual: "%s" expect: "%s"' % (_print_path(path), actual, expect))
+
+
+def _error_unknown_type(path, typ):
+ '''Report that there is an unknown type in the JSON object.'''
+ _report_error('unknown type at %s: "%s"' % (_print_path(path), typ))
+
+
+def _error_length_mismatch(path, actual, expect):
+ '''Report a length mismatch in an object or array.'''
+ _report_error('length mismatch at %s: actual: "%s" expect: "%s"' % (_print_path(path), actual, expect))
+
+
+def _error_unexpect_value(path, actual, expect):
+ '''Report a value mismatch.'''
+ _report_error('value mismatch at %s: actual: "%s" expect: "%s"' % (_print_path(path), actual, expect))
+
+
+def _error_extra_key(path, key):
+ '''Report on a key that is unexpected.'''
+ _report_error('extra key at %s: "%s"' % (_print_path(path), key))
+
+
+def _error_missing_key(path, key):
+ '''Report on a key that is missing.'''
+ _report_error('extra key at %s: %s' % (_print_path(path), key))
+
+
+def _compare_object(path, actual, expect):
+ '''Compare a JSON object.'''
+ is_ok = True
+
+ if not len(actual) == len(expect):
+ _error_length_mismatch(path, len(actual), len(expect))
+ is_ok = False
+
+ for key in actual:
+ if key not in expect:
+ _error_extra_key(path, key)
+ is_ok = False
+ else:
+ sub_error = compare_json(path + [key], actual[key], expect[key])
+ if sub_error:
+ is_ok = False
+
+ for key in expect:
+ if key not in actual:
+ _error_missing_key(path, key)
+ is_ok = False
+
+ return is_ok
+
+
+def _compare_array(path, actual, expect):
+ '''Compare a JSON array.'''
+ is_ok = True
+
+ if not len(actual) == len(expect):
+ _error_length_mismatch(path, len(actual), len(expect))
+ is_ok = False
+
+ for (idx, (a, e)) in enumerate(zip(actual, expect)):
+ sub_error = compare_json(path + [str(idx)], a, e)
+ if sub_error:
+ is_ok = False
+
+ return is_ok
+
+
+def _make_replacements(value):
+ for (old, new) in REPLACEMENTS.values():
+ value = value.replace(old, new)
+ return value
+
+
+def _compare_string(path, actual, expect):
+ '''Compare a JSON string supporting replacements in the expected output.'''
+ expect = _make_replacements(expect)
+
+ if not actual == expect:
+ _error_unexpect_value(path, actual, expect)
+ return False
+ else:
+ print('%s is ok: %s' % (_print_path(path), actual))
+ return True
+
+
+def _compare_number(path, actual, expect):
+ '''Compare a JSON integer.'''
+ if not actual == expect:
+ _error_unexpect_value(path, actual, expect)
+ return False
+ else:
+ print('%s is ok: %s' % (_print_path(path), actual))
+ return True
+
+
+def _inspect_ordering(arr):
+ req_ordering = True
+
+ if not arr:
+ return arr, req_ordering
+
+ if arr[0] == '__P1689_unordered__':
+ arr.pop(0)
+ req_ordering = False
+
+ return arr, req_ordering
+
+
+def compare_json(path, actual, expect):
+ actual_type = type(actual)
+ expect_type = type(expect)
+
+ is_ok = True
+
+ if not actual_type == expect_type:
+ _error_type_mismatch(path, actual_type, expect_type)
+ is_ok = False
+ elif actual_type == dict:
+ is_ok = _compare_object(path, actual, expect)
+ elif actual_type == list:
+ expect, req_ordering = _inspect_ordering(expect)
+ if not req_ordering:
+ actual = set(actual)
+ expect = set(expect)
+ is_ok = _compare_array(path, actual, expect)
+ elif actual_type == str:
+ is_ok = _compare_string(path, actual, expect)
+ elif actual_type == float:
+ is_ok = _compare_number(path, actual, expect)
+ elif actual_type == int:
+ is_ok = _compare_number(path, actual, expect)
+ elif actual_type == bool:
+ is_ok = _compare_number(path, actual, expect)
+ elif actual_type == type(None):
+ pass
+ else:
+ _error_unknown_type(path, actual_type)
+ is_ok = False
+
+ return is_ok
+
+
+def validate_p1689(actual, expect):
+ '''Validate a P1689 file against an expected output file.
+
+ Returns `False` if it fails, `True` if they are the same.
+ '''
+ with open(actual, 'r') as fin:
+ actual_content = fin.read()
+ with open(expect, 'r') as fin:
+ expect_content = fin.read()
+
+ actual_json = json.loads(actual_content)
+ expect_json = json.loads(expect_content)
+
+ return compare_json([], actual_json, expect_json)
+
+
+if __name__ == '__main__':
+ import sys
+
+ actual = None
+ expect = None
+
+ # Parse arguments.
+ args = sys.argv[1:]
+ while args:
+ # Take an argument.
+ arg = args.pop(0)
+
+ # Parse out replacement expressions.
+ if arg == '-r' or arg == '--replace':
+ replacement = args.pop(0)
+ (key, value) = replacement.split('=', maxsplit=1)
+ REPLACEMENTS[key] = value
+ # Flag to change how errors are reported.
+ elif arg == '-A' or arg == '--all':
+ ALL_ERRORS = True
+ # Required arguments.
+ elif arg == '-a' or arg == '--actual':
+ actual = args.pop(0)
+ elif arg == '-e' or arg == '--expect':
+ expect = args.pop(0)
+
+ # Validate that we have the required arguments.
+ if actual is None:
+ raise RuntimeError('missing "actual" file')
+ if expect is None:
+ raise RuntimeError('missing "expect" file')
+
+ # Do the actual work.
+ is_ok = validate_p1689(actual, expect)
+
+ # Fail if errors are found.
+ if not is_ok:
+ sys.exit(1)
diff --git a/gcc/testsuite/lib/modules.exp b/gcc/testsuite/lib/modules.exp
new file mode 100644
index 00000000000..d466a73cbe1
--- /dev/null
+++ b/gcc/testsuite/lib/modules.exp
@@ -0,0 +1,71 @@
+# Copyright (C) 1997-2022 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3. If not see
+# <http://www.gnu.org/licenses/>.
+
+# Verify various kinds of gcov output: line counts, branch percentages,
+# and call return percentages. None of this is language-specific.
+
+load_lib "target-supports.exp"
+
+#
+# clean-p1689-file -- delete a working file the compiler creates for p1689
+#
+# TESTCASE is the name of the test.
+# SUFFIX is file suffix
+
+proc clean-p1689-file { testcase suffix } {
+ set basename [file tail $testcase]
+ set base [file rootname $basename]
+ remote_file host delete $base.$suffix
+}
+
+#
+# clean-p1689 -- delete the working files the compiler creates for p1689
+#
+# TESTCASE is the name of the test.
+#
+proc clean-p1689 { testcase } {
+ clean-p1689-file $testcase "d"
+ clean-p1689-file $testcase "ddi"
+}
+
+# Call by dg-final to check a P1689 dependency file
+
+proc run-check-p1689-valid { depfile template } {
+ global srcdir subdir
+ # Extract the test file name from the arguments.
+ set testcase [file rootname [file tail $depfile]]
+
+ verbose "Running P1689 validation for $testcase in $srcdir/$subdir" 2
+ set testcase [remote_download host $testcase]
+
+ set pytest_script "test-p1689.py"
+ if { ![check_effective_target_recent_python3] } {
+ unsupported "$pytest_script python3 is missing"
+ return
+ }
+
+ verbose "running script" 1
+ spawn -noecho python3 $srcdir/$subdir/$pytest_script --all --actual $depfile --expect $srcdir/$subdir/$template
+
+ expect {
+ -re "ERROR: (\[^\r\n\]*)" {
+ fail $expect_out(0,string)
+ exp_continue
+ }
+ }
+
+ clean-p1689 $testcase
+}
diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index aef703f8111..b2cbdc8ceec 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -302,6 +302,9 @@ typedef CPPCHAR_SIGNED_T cppchar_signed_t;
/* Style of header dependencies to generate. */
enum cpp_deps_style { DEPS_NONE = 0, DEPS_USER, DEPS_SYSTEM };
+/* Structured format of module dependencies to generate. */
+enum cpp_fdeps_format { FDEPS_FMT_NONE = 0, FDEPS_FMT_P1689R5 };
+
/* The possible normalization levels, from most restrictive to least. */
enum cpp_normalize_level {
/* In NFKC. */
@@ -589,6 +592,9 @@ struct cpp_options
/* Style of header dependencies to generate. */
enum cpp_deps_style style;
+ /* Structured format of module dependencies to generate. */
+ enum cpp_fdeps_format fdeps_format;
+
/* Assume missing files are generated files. */
bool missing_files;
@@ -1112,9 +1118,9 @@ extern void cpp_post_options (cpp_reader *);
extern void cpp_init_iconv (cpp_reader *);
/* Call this to finish preprocessing. If you requested dependency
- generation, pass an open stream to write the information to,
- otherwise NULL. It is your responsibility to close the stream. */
-extern void cpp_finish (cpp_reader *, FILE *deps_stream);
+ generation, pass open stream(s) to write the information to,
+ otherwise NULL. It is your responsibility to close the stream(s). */
+extern void cpp_finish (cpp_reader *, FILE *deps_stream, FILE *fdeps_stream = NULL);
/* Call this to release the handle at the end of preprocessing. Any
use of the handle after this function returns is invalid. */
diff --git a/libcpp/include/mkdeps.h b/libcpp/include/mkdeps.h
index 920e2791334..7025e634caf 100644
--- a/libcpp/include/mkdeps.h
+++ b/libcpp/include/mkdeps.h
@@ -53,11 +53,15 @@ extern void deps_add_default_target (class mkdeps *, const char *);
/* Adds a module target. The module name and cmi name are copied. */
extern void deps_add_module_target (struct mkdeps *, const char *module,
- const char *cmi, bool is_header);
+ const char *cmi, bool is_header,
+ bool is_exported);
/* Adds a module dependency. The module name is copied. */
extern void deps_add_module_dep (struct mkdeps *, const char *module);
+/* Add a structured dependency target. */
+extern void fdeps_add_target (struct mkdeps *, const char *, bool);
+
/* Add a dependency (appears on the right side of the colon) to the
deps list. Dependencies will be printed in the order that they
were entered with this function. By convention, the first
@@ -68,6 +72,9 @@ extern void deps_add_dep (class mkdeps *, const char *);
is the number of columns to word-wrap at (0 means don't wrap). */
extern void deps_write (const cpp_reader *, FILE *, unsigned int);
+/* Write out a deps buffer to a specified file in P1689R5 format. */
+extern void deps_write_p1689r5 (const struct mkdeps *, FILE *);
+
/* Write out a deps buffer to a file, in a form that can be read back
with deps_restore. Returns nonzero on error, in which case the
error number will be in errno. */
diff --git a/libcpp/init.cc b/libcpp/init.cc
index 693feaa31ed..9a20f8d8176 100644
--- a/libcpp/init.cc
+++ b/libcpp/init.cc
@@ -860,7 +860,7 @@ read_original_directory (cpp_reader *pfile)
Maybe it should also reset state, such that you could call
cpp_start_read with a new filename to restart processing. */
void
-cpp_finish (cpp_reader *pfile, FILE *deps_stream)
+cpp_finish (struct cpp_reader *pfile, FILE *deps_stream, FILE *fdeps_stream)
{
/* Warn about unused macros before popping the final buffer. */
if (CPP_OPTION (pfile, warn_unused_macros))
@@ -874,8 +874,15 @@ cpp_finish (cpp_reader *pfile, FILE *deps_stream)
while (pfile->buffer)
_cpp_pop_buffer (pfile);
- if (deps_stream)
- deps_write (pfile, deps_stream, 72);
+ cpp_fdeps_format fdeps_format = CPP_OPTION (pfile, deps.fdeps_format);
+ if (fdeps_format == FDEPS_FMT_P1689R5 && fdeps_stream)
+ deps_write_p1689r5 (pfile->deps, fdeps_stream);
+
+ if (CPP_OPTION (pfile, deps.style) != DEPS_NONE
+ && deps_stream)
+ {
+ deps_write (pfile, deps_stream, 72);
+ }
/* Report on headers that could use multiple include guards. */
if (CPP_OPTION (pfile, print_include_names))
diff --git a/libcpp/mkdeps.cc b/libcpp/mkdeps.cc
index 8f9585c3c0a..ad52446506a 100644
--- a/libcpp/mkdeps.cc
+++ b/libcpp/mkdeps.cc
@@ -81,7 +81,8 @@ public:
};
mkdeps ()
- : module_name (NULL), cmi_name (NULL), is_header_unit (false), quote_lwm (0)
+ : primary_output (NULL), module_name (NULL), cmi_name (NULL)
+ , is_header_unit (false), is_exported (false), quote_lwm (0)
{
}
~mkdeps ()
@@ -90,6 +91,9 @@ public:
for (i = targets.size (); i--;)
free (const_cast <char *> (targets[i]));
+ free (const_cast <char *> (primary_output));
+ for (i = fdeps_targets.size (); i--;)
+ free (const_cast <char *> (fdeps_targets[i]));
for (i = deps.size (); i--;)
free (const_cast <char *> (deps[i]));
for (i = vpath.size (); i--;)
@@ -103,6 +107,8 @@ public:
public:
vec<const char *> targets;
vec<const char *> deps;
+ const char * primary_output;
+ vec<const char *> fdeps_targets;
vec<velt> vpath;
vec<const char *> modules;
@@ -110,6 +116,7 @@ public:
const char *module_name;
const char *cmi_name;
bool is_header_unit;
+ bool is_exported;
unsigned short quote_lwm;
};
@@ -288,6 +295,26 @@ deps_add_default_target (class mkdeps *d, const char *tgt)
}
}
+/* Adds a target O. We make a copy, so it need not be a permanent
+ string.
+
+ This is the target associated with the rule that (in a C++ modules build)
+ compiles the source that is being scanned for dynamic dependencies. It is
+ used to associate the structured dependency information with that rule as
+ needed. */
+void
+fdeps_add_target (struct mkdeps *d, const char *o, bool is_primary)
+{
+ o = apply_vpath (d, o);
+ if (is_primary)
+ {
+ if (d->primary_output)
+ d->fdeps_targets.push (d->primary_output);
+ d->primary_output = xstrdup (o);
+ } else
+ d->fdeps_targets.push (xstrdup (o));
+}
+
void
deps_add_dep (class mkdeps *d, const char *t)
{
@@ -325,12 +352,13 @@ deps_add_vpath (class mkdeps *d, const char *vpath)
void
deps_add_module_target (struct mkdeps *d, const char *m,
- const char *cmi, bool is_header_unit)
+ const char *cmi, bool is_header_unit, bool is_exported)
{
gcc_assert (!d->module_name);
d->module_name = xstrdup (m);
d->is_header_unit = is_header_unit;
+ d->is_exported = is_exported;
d->cmi_name = xstrdup (cmi);
}
@@ -395,10 +423,16 @@ make_write (const cpp_reader *pfile, FILE *fp, unsigned int colmax)
if (colmax && colmax < 34)
colmax = 34;
+ /* Write out C++ modules information if no other `-fdeps-format=`
+ option is given. */
+ cpp_fdeps_format fdeps_format = CPP_OPTION (pfile, deps.fdeps_format);
+ bool write_make_modules_deps = (fdeps_format == FDEPS_FMT_NONE &&
+ CPP_OPTION (pfile, deps.modules));
+
if (d->deps.size ())
{
column = make_write_vec (d->targets, fp, 0, colmax, d->quote_lwm);
- if (CPP_OPTION (pfile, deps.modules) && d->cmi_name)
+ if (write_make_modules_deps && d->cmi_name)
column = make_write_name (d->cmi_name, fp, column, colmax);
fputs (":", fp);
column++;
@@ -409,7 +443,7 @@ make_write (const cpp_reader *pfile, FILE *fp, unsigned int colmax)
fprintf (fp, "%s:\n", munge (d->deps[i]));
}
- if (!CPP_OPTION (pfile, deps.modules))
+ if (!write_make_modules_deps)
return;
if (d->modules.size ())
@@ -473,6 +507,127 @@ deps_write (const cpp_reader *pfile, FILE *fp, unsigned int colmax)
make_write (pfile, fp, colmax);
}
+/* Write out a a filepath for P1689R5 output. */
+
+static void
+p1689r5_write_filepath (const char *name, FILE *fp)
+{
+ if (cpp_valid_utf8_p (name, strlen (name)))
+ {
+ fputc ('"', fp);
+ for (const char* c = name; *c; c++)
+ {
+ // Escape control characters.
+ if (ISCNTRL (*c))
+ fprintf (fp, "\\u%04x", *c);
+ // JSON escape characters.
+ else if (*c == '"' || *c == '\\')
+ {
+ fputc ('\\', fp);
+ fputc (*c, fp);
+ }
+ // Everything else.
+ else
+ fputc (*c, fp);
+ }
+ fputc ('"', fp);
+ }
+ else
+ {
+ // TODO: print an error
+ }
+}
+
+/* Write a JSON array from a `vec` for P1689R5 output.
+
+ In P1689R5, all array values are filepaths. */
+
+static void
+p1689r5_write_vec (const mkdeps::vec<const char *> &vec, FILE *fp)
+{
+ for (unsigned ix = 0; ix != vec.size (); ix++)
+ {
+ p1689r5_write_filepath (vec[ix], fp);
+ if (ix < vec.size () - 1)
+ fputc (',', fp);
+ fputc ('\n', fp);
+ }
+}
+
+/* Write out the P1689R5 format using the module dependency tracking
+ information gathered while scanning and/or compiling.
+
+ Ideally this (and the above `p1689r5_` functions) would use `gcc/json.h`,
+ but since this is `libcpp`, we cannot use `gcc/` code.
+
+ TODO: move `json.h` to libiberty. */
+
+void
+deps_write_p1689r5 (const struct mkdeps *d, FILE *fp)
+{
+ fputs ("{\n", fp);
+
+ fputs ("\"rules\": [\n", fp);
+ fputs ("{\n", fp);
+
+ if (d->primary_output)
+ {
+ fputs ("\"primary-output\": ", fp);
+ p1689r5_write_filepath (d->primary_output, fp);
+ fputs (",\n", fp);
+ }
+
+ if (d->fdeps_targets.size ())
+ {
+ fputs ("\"outputs\": [\n", fp);
+ p1689r5_write_vec (d->fdeps_targets, fp);
+ fputs ("],\n", fp);
+ }
+
+ if (d->module_name)
+ {
+ fputs ("\"provides\": [\n", fp);
+ fputs ("{\n", fp);
+
+ fputs ("\"logical-name\": ", fp);
+ p1689r5_write_filepath (d->module_name, fp);
+ fputs (",\n", fp);
+
+ fprintf (fp, "\"is-interface\": %s\n", d->is_exported ? "true" : "false");
+
+ // TODO: header-unit information
+
+ fputs ("}\n", fp);
+ fputs ("],\n", fp);
+ }
+
+ fputs ("\"requires\": [\n", fp);
+ for (size_t i = 0; i < d->modules.size (); i++)
+ {
+ if (i != 0)
+ fputs (",\n", fp);
+ fputs ("{\n", fp);
+
+ fputs ("\"logical-name\": ", fp);
+ p1689r5_write_filepath (d->modules[i], fp);
+ fputs ("\n", fp);
+
+ // TODO: header-unit information
+
+ fputs ("}\n", fp);
+ }
+ fputs ("]\n", fp);
+
+ fputs ("}\n", fp);
+
+ fputs ("],\n", fp);
+
+ fputs ("\"version\": 0,\n", fp);
+ fputs ("\"revision\": 0\n", fp);
+
+ fputs ("}\n", fp);
+}
+
/* Write out a deps buffer to a file, in a form that can be read back
with deps_restore. Returns nonzero on error, in which case the
error number will be in errno. */
--
2.41.0
next prev parent reply other threads:[~2023-09-01 13:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-01 13:04 [PATCH v8 0/4] P1689R5 support Ben Boeckel
2023-09-01 13:04 ` [PATCH v8 1/4] spec: add a spec function to join arguments Ben Boeckel
2023-09-01 13:04 ` Ben Boeckel [this message]
2023-09-01 13:04 ` [PATCH v8 3/4] c++modules: report imported CMI files as dependencies Ben Boeckel
2023-09-01 13:04 ` [PATCH v8 4/4] c++modules: report module mapper files as a dependency Ben Boeckel
2023-09-19 21:33 ` [PATCH v8 0/4] P1689R5 support Jason Merrill
2023-09-20 14:44 ` Ben Boeckel
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