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gold: Add a linker configure option --enable-relro

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Add a configure option --enable-relro to decide whether -z relro should
be enabled by default.  Default to yes.

	PR ld/20283
	* NEWS: Mention --enable-relro.
	* configure.ac: Add --enable-relro.
	(DEFAULT_LD_Z_RELRO): New.  Set by --enable-relro and default
	to 1.
	* config.in: Regenerated.
	* configure: Likewise.
	* options.h (General_options::relro): Default to
	DEFAULT_LD_Z_RELRO.
This commit is contained in:
H.J. Lu 2016-06-22 05:39:22 -07:00
parent 647e4d4649
commit 6b1edb94fe
6 changed files with 57 additions and 1 deletions
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12
gold/ChangeLog
View file

@ -1,3 +1,15 @@
2016-06-22 H.J. Lu <hongjiu.lu@intel.com>
PR ld/20283
* NEWS: Mention --enable-relro.
* configure.ac: Add --enable-relro.
(DEFAULT_LD_Z_RELRO): New. Set by --enable-relro and default
to 1.
* config.in: Regenerated.
* configure: Likewise.
* options.h (General_options::relro): Default to
DEFAULT_LD_Z_RELRO.
2016-06-20 Cary Coutant <ccoutant@gmail.com>
* NEWS: Add new features in 1.12.

3
gold/NEWS
View file

@ -1,5 +1,8 @@
Changes in 1.12:
* Add a configure option --enable-relro to decide whether -z relro should
be enabled by default. Default to yes.
* Add support for s390, MIPS, AArch64, and TILE-Gx architectures.
* Add support for STT_GNU_IFUNC symbols.

3
gold/config.in
View file

@ -10,6 +10,9 @@
/* Define if building universal (internal helper macro) */
#undef AC_APPLE_UNIVERSAL_BUILD
/* Define to 1 if you want to enable -z relro in ELF linker by default. */
#undef DEFAULT_LD_Z_RELRO
/* Define to 1 if translation of program messages to the user's native
language is requested. */
#undef ENABLE_NLS

21
gold/configure vendored
View file

@ -792,6 +792,7 @@ with_sysroot
enable_gold
enable_threads
enable_plugins
enable_relro
enable_targets
with_lib_path
enable_dependency_tracking
@ -1441,6 +1442,7 @@ Optional Features:
--enable-gold[=ARG] build gold [ARG={default,yes,no}]
--enable-threads multi-threaded linking
--enable-plugins linker plugins
--enable-relro enable -z relro in ELF linker by default
--enable-targets alternative target configurations
--disable-dependency-tracking speeds up one-time build
--enable-dependency-tracking do not reject slow dependency extractors
@ -3353,6 +3355,25 @@ else
fi
# Decide if -z relro should be enabled in ELF linker by default.
ac_default_ld_z_relro=unset
# Provide a configure time option to override our default.
# Check whether --enable-relro was given.
if test "${enable_relro+set}" = set; then :
enableval=$enable_relro; case "${enableval}" in
yes) ac_default_ld_z_relro=1 ;;
no) ac_default_ld_z_relro=0 ;;
esac
fi
if test "${ac_default_ld_z_relro}" = unset; then
ac_default_ld_z_relro=1
fi
cat >>confdefs.h <<_ACEOF
#define DEFAULT_LD_Z_RELRO $ac_default_ld_z_relro
_ACEOF
# Check whether --enable-targets was given.
if test "${enable_targets+set}" = set; then :
enableval=$enable_targets; case "${enableval}" in

17
gold/configure.ac
View file

@ -114,6 +114,23 @@ if test "$plugins" = "yes"; then
fi
AM_CONDITIONAL(PLUGINS, test "$plugins" = "yes")
# Decide if -z relro should be enabled in ELF linker by default.
ac_default_ld_z_relro=unset
# Provide a configure time option to override our default.
AC_ARG_ENABLE(relro,
AS_HELP_STRING([--enable-relro],
[enable -z relro in ELF linker by default]),
[case "${enableval}" in
yes) ac_default_ld_z_relro=1 ;;
no) ac_default_ld_z_relro=0 ;;
esac])dnl
if test "${ac_default_ld_z_relro}" = unset; then
ac_default_ld_z_relro=1
fi
AC_DEFINE_UNQUOTED(DEFAULT_LD_Z_RELRO,
$ac_default_ld_z_relro,
[Define to 1 if you want to enable -z relro in ELF linker by default.])
AC_ARG_ENABLE([targets],
[ --enable-targets alternative target configurations],
[case "${enableval}" in

2
gold/options.h
View file

@ -1336,7 +1336,7 @@ class General_options
DEFINE_bool(origin, options::DASH_Z, '\0', false,
N_("Mark DSO to indicate that needs immediate $ORIGIN "
"processing at runtime"), NULL);
DEFINE_bool(relro, options::DASH_Z, '\0', false,
DEFINE_bool(relro, options::DASH_Z, '\0', DEFAULT_LD_Z_RELRO,
N_("Where possible mark variables read-only after relocation"),
N_("Don't mark variables read-only after relocation"));
DEFINE_bool(text, options::DASH_Z, '\0', false,