From: Florian Weimer <fweimer@redhat.com>
To: libc-alpha@sourceware.org
Subject: [PATCH v2 3/6] Add --with-rtld-early-cflags configure option
Date: Fri, 14 Jan 2022 17:52:57 +0100 [thread overview]
Message-ID: <715520a1d4e694057ead5b76e58eac4af5ee76f5.1642179009.git.fweimer@redhat.com> (raw)
In-Reply-To: <cover.1642179009.git.fweimer@redhat.com>
---
v2: Rename configure option. Regenerate INSTALL.
INSTALL | 8 ++++++++
config.make.in | 1 +
configure | 13 +++++++++++++
configure.ac | 6 ++++++
elf/Makefile | 8 ++++++++
manual/install.texi | 7 +++++++
6 files changed, 43 insertions(+)
diff --git a/INSTALL b/INSTALL
index 331d405e56..a9dc12fa31 100644
--- a/INSTALL
+++ b/INSTALL
@@ -106,6 +106,14 @@ if 'CFLAGS' is specified it must enable optimization. For example:
particular case and potentially change debugging information and
metadata only).
+'--with-rtld-early-cflags=CFLAGS'
+ Use additional compiler flags CFLAGS to build the early startup
+ code of the dynamic linker. These flags can be used to enable
+ early dynamic linker diagnostics to run on CPUs which are not
+ compatible with the rest of the GNU C Library, for example, due to
+ compiler flags which target a later instruction set architecture
+ (ISA).
+
'--with-timeoutfactor=NUM'
Specify an integer NUM to scale the timeout of test programs. This
factor can be changed at run time using 'TIMEOUTFACTOR' environment
diff --git a/config.make.in b/config.make.in
index e8630a8d0c..6d43e691f7 100644
--- a/config.make.in
+++ b/config.make.in
@@ -110,6 +110,7 @@ CFLAGS = @CFLAGS@
CPPFLAGS-config = @CPPFLAGS@
CPPUNDEFS = @CPPUNDEFS@
extra-nonshared-cflags = @extra_nonshared_cflags@
+rtld-early-cflags = @rtld_early_cflags@
ASFLAGS-config = @ASFLAGS_config@
AR = @AR@
NM = @NM@
diff --git a/configure b/configure
index 3f956cf777..6a7e5c6164 100755
--- a/configure
+++ b/configure
@@ -681,6 +681,7 @@ force_install
bindnow
hardcoded_path_in_tests
enable_timezone_tools
+rtld_early_cflags
extra_nonshared_cflags
use_default_link
sysheaders
@@ -761,6 +762,7 @@ with_selinux
with_headers
with_default_link
with_nonshared_cflags
+with_rtld_early_cflags
with_timeoutfactor
enable_sanity_checks
enable_shared
@@ -1480,6 +1482,8 @@ Optional Packages:
--with-default-link do not use explicit linker scripts
--with-nonshared-cflags=CFLAGS
build nonshared libraries with additional CFLAGS
+ --with-rtld-early-cflags=CFLAGS
+ build early initialization with additional CFLAGS
--with-timeoutfactor=NUM
specify an integer to scale the timeout
--with-cpu=CPU select code for CPU variant
@@ -3386,6 +3390,15 @@ fi
+# Check whether --with-rtld-early-cflags was given.
+if test "${with_rtld_early_cflags+set}" = set; then :
+ withval=$with_rtld_early_cflags; rtld_early_cflags=$withval
+else
+ rtld_early_cflags=
+fi
+
+
+
# Check whether --with-timeoutfactor was given.
if test "${with_timeoutfactor+set}" = set; then :
diff --git a/configure.ac b/configure.ac
index 277d3527d2..40f2de1661 100644
--- a/configure.ac
+++ b/configure.ac
@@ -162,6 +162,12 @@ AC_ARG_WITH([nonshared-cflags],
[extra_nonshared_cflags=$withval],
[extra_nonshared_cflags=])
AC_SUBST(extra_nonshared_cflags)
+AC_ARG_WITH([rtld-early-cflags],
+ AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
+ [build early initialization with additional CFLAGS]),
+ [rtld_early_cflags=$withval],
+ [rtld_early_cflags=])
+AC_SUBST(rtld_early_cflags)
AC_ARG_WITH([timeoutfactor],
AS_HELP_STRING([--with-timeoutfactor=NUM],
diff --git a/elf/Makefile b/elf/Makefile
index 3df49742ff..e6a28b243b 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -167,6 +167,14 @@ CFLAGS-.o += $(call elide-stack-protector,.o,$(elide-routines.os))
CFLAGS-.op += $(call elide-stack-protector,.op,$(elide-routines.os))
CFLAGS-.os += $(call elide-stack-protector,.os,$(all-rtld-routines))
+# Add the requested compiler flags to the early startup code.
+CFLAGS-dl-printf.os += $(rtld-early-cflags)
+CFLAGS-dl-sysdep.os += $(rtld-early-cflags)
+CFLAGS-dl-tunables.os += $(rtld-early-cflags)
+CFLAGS-dl-write.os += $(rtld-early-cflags)
+CFLAGS-dl-writev.os += $(rtld-early-cflags)
+CFLAGS-rtld.os += $(rtld-early-cflags)
+
ifeq ($(unwind-find-fde),yes)
routines += unwind-dw2-fde-glibc
shared-only-routines += unwind-dw2-fde-glibc
diff --git a/manual/install.texi b/manual/install.texi
index b1afc56f5a..accaef45fa 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -131,6 +131,13 @@ that the objects in @file{libc_nonshared.a} are compiled with this flag
(although this will not affect the generated code in this particular
case and potentially change debugging information and metadata only).
+@item --with-rtld-early-cflags=@var{cflags}
+Use additional compiler flags @var{cflags} to build the early startup
+code of the dynamic linker. These flags can be used to enable early
+dynamic linker diagnostics to run on CPUs which are not compatible with
+the rest of @theglibc{}, for example, due to compiler flags which target
+a later instruction set architecture (ISA).
+
@item --with-timeoutfactor=@var{NUM}
Specify an integer @var{NUM} to scale the timeout of test programs.
This factor can be changed at run time using @env{TIMEOUTFACTOR}
--
2.34.1
next prev parent reply other threads:[~2022-01-14 16:53 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 16:51 [PATCH v2 0/6] Reliable CPU compatibility diagnostics in ld.so Florian Weimer
2022-01-14 16:52 ` [PATCH v2 1/6] elf/Makefile: Reflow and sort most variable assignments Florian Weimer
2022-01-14 18:39 ` H.J. Lu
2022-01-14 16:52 ` [PATCH v2 2/6] elf: Split dl-printf.c from dl-misc.c Florian Weimer
2022-01-14 18:40 ` H.J. Lu
2022-01-14 16:52 ` Florian Weimer [this message]
2022-01-14 18:38 ` [PATCH v2 3/6] Add --with-rtld-early-cflags configure option H.J. Lu
2022-01-14 16:53 ` [PATCH v2 4/6] powerpc64le: Use <gcc-macros.h> in early HWCAP check Florian Weimer
2022-01-14 18:51 ` Carlos O'Donell
2022-01-14 16:53 ` [PATCH v2 5/6] x86: Add x86-64-vN check to early startup Florian Weimer
2022-01-14 18:40 ` H.J. Lu
2022-01-14 16:53 ` [PATCH 6/6] s390x: Use <gcc-macros.h> in early HWCAP check Florian Weimer
2022-01-14 18:52 ` Carlos O'Donell
2022-01-14 17:42 ` [PATCH v2 0/6] Reliable CPU compatibility diagnostics in ld.so Joseph Myers
2022-01-14 17:59 ` Florian Weimer
2022-01-14 18:51 ` Carlos O'Donell
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