From: Florian Weimer <fweimer@redhat.com>
To: gcc-patches@gcc.gnu.org
Subject: [PATCH] c-family: Enable -fpermissive for C and ObjC
Date: Thu, 19 Oct 2023 10:43:52 +0200 [thread overview]
Message-ID: <87il73rohj.fsf@oldenburg.str.redhat.com> (raw)
Future changes will treat some C front end warnings similar to
-Wnarrowing.
There are no new tests because there are no such C warnings yet. The
existing test suite covers the -std=gnu89 -pedantic-errors corner cases
(which should not turn on -fpermissive).
gcc/
* doc/invoke.texi (Warning Options): Mention C diagnostics
for -fpermissive.
gcc/c-family/
* c.opt (fpermissive): Enable for C and ObjC.
* c-opts.cc (set_std_c89): Enable -fpermissive.
---
gcc/c-family/c-opts.cc | 6 ++++++
gcc/c-family/c.opt | 2 +-
gcc/doc/invoke.texi | 8 ++++++--
3 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/gcc/c-family/c-opts.cc b/gcc/c-family/c-opts.cc
index ce2e021e69d..9a4beb4b024 100644
--- a/gcc/c-family/c-opts.cc
+++ b/gcc/c-family/c-opts.cc
@@ -1711,6 +1711,12 @@ set_std_c89 (int c94, int iso)
flag_isoc99 = 0;
flag_isoc11 = 0;
flag_isoc2x = 0;
+ /* -std=gnu89 etc. should not override -pedantic-errors. */
+ if (!global_dc->pedantic_errors)
+ {
+ flag_permissive = 1;
+ global_dc->permissive = 1;
+ }
lang_hooks.name = "GNU C89";
}
diff --git a/gcc/c-family/c.opt b/gcc/c-family/c.opt
index 44b9c862c14..e6ea5e52d24 100644
--- a/gcc/c-family/c.opt
+++ b/gcc/c-family/c.opt
@@ -2108,7 +2108,7 @@ C ObjC C++ ObjC++
Look for and use PCH files even when preprocessing.
fpermissive
-C++ ObjC++ Var(flag_permissive)
+C ObjC C++ ObjC++ Var(flag_permissive)
Downgrade conformance errors to warnings.
fplan9-extensions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 9b5ff457027..cfebab78f83 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -6166,13 +6166,17 @@ errors by @option{-pedantic-errors}. For instance:
Downgrade some required diagnostics about nonconformant code from
errors to warnings. Thus, using @option{-fpermissive} allows some
nonconforming code to compile. Some C++ diagnostics are controlled
-only by this flag, but it also downgrades some diagnostics that have
-their own flag:
+only by this flag, but it also downgrades some C and C++ diagnostics
+that have their own flag:
@gccoptlist{
-Wnarrowing @r{(C++)}
}
+The @option{-fpermissive} option is the default for historic C language
+modes (@option{-std=c89}, @option{-std=gnu89}, @option{-std=c90},
+@option{-std=gnu90}).
+
@opindex Wall
@opindex Wno-all
@item -Wall
base-commit: 8f4bbdc28df6e87a7ad5ec5ca191a7a836a4f016
next reply other threads:[~2023-10-19 8:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-19 8:43 Florian Weimer [this message]
2023-11-06 17:37 Florian Weimer
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