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check if the linker supports a flag instead of just checking for GNU ld

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* configure.in: move AM_PROG_LIBTOOL to the top
  (ld_supports_flag): new function for checking if the linker supports
  a given flag
This commit is contained in:
John (J5) Palmieri 2008-03-04 13:09:07 -05:00
parent d511324fff
commit bd561f9a19
2 changed files with 42 additions and 26 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2008-03-04 John (J5) Palmieri <johnp@redhat.com>
* check if the linker supports a flag instead of just checking for GNU
ld
* configure.in: move AM_PROG_LIBTOOL to the top
(ld_supports_flag): new function for checking if the linker supports
a given flag
2008-03-04 John (J5) Palmieri <johnp@redhat.com>
* add a changelog for Benjamin Reed's git patch RANT: Change Logs are

60
configure.in
View file

@ -60,6 +60,7 @@ AC_PROG_CXX
AC_ISC_POSIX
AC_HEADER_STDC
AC_C_INLINE
AM_PROG_LIBTOOL
AC_ARG_ENABLE(tests, AS_HELP_STRING([--enable-tests],[enable unit test code]),enable_tests=$enableval,enable_tests=$USE_MAINTAINER_MODE)
AC_ARG_ENABLE(ansi, AS_HELP_STRING([--enable-ansi],[enable -ansi -pedantic gcc flags]),enable_ansi=$enableval,enable_ansi=no)
@ -144,6 +145,36 @@ cc_supports_flag() {
return $rc
}
ld_supports_flag() {
AC_MSG_CHECKING([whether $LD supports "$@"])
AC_TRY_LINK([
int one(void) { return 1; }
int two(void) { return 2; }
], [ two(); ] , [_ac_ld_flag_supported=yes], [_ac_ld_flag_supported=no])
if test "$_ac_ld_flag_supported" = "yes"; then
rm -f conftest.c
touch conftest.c
if $CC -c conftest.c; then
ld_out=`$LD $@ -o conftest conftest.o 2>&1`
ld_ret=$?
if test $ld_ret -ne 0 ; then
_ac_ld_flag_supported=no
elif echo "$ld_out" | egrep 'option ignored|^usage:|unrecognized option|illegal option' >/dev/null ; then
_ac_ld_flag_supported=no
fi
fi
rm -f conftest.c conftest.o conftest
fi
AC_MSG_RESULT($_ac_ld_flag_supported)
if test "$_ac_ld_flag_supported" = "yes" ; then
return 0
else
return 1
fi
}
if test "x$GCC" = "xyes"; then
changequote(,)dnl
case " $CFLAGS " in
@ -214,7 +245,7 @@ if test "x$GCC" = "xyes"; then
*[\ \ ]-fPIC[\ \ ]*) ;;
*) if cc_supports_flag -fPIC; then
PIC_CFLAGS="-fPIC"
if [ "x$with_gnu_ld" = "xyes" ]; then
if ld_supports_flag -z,relro; then
PIC_LDFLAGS="-Wl,-z,relro"
fi
fi
@ -225,7 +256,7 @@ if test "x$GCC" = "xyes"; then
*[\ \ ]-fPIE[\ \ ]*) ;;
*) if cc_supports_flag -fPIE; then
PIE_CFLAGS="-fPIE"
if [ "x$with_gnu_ld" = "xyes" ]; then
if ld_supports_flag -z,relro; then
PIE_LDFLAGS="-pie -Wl,-z,relro"
else
PIE_LDFLAGS="-pie"
@ -280,28 +311,7 @@ AC_SUBST(PIC_LDFLAGS)
AC_SUBST(PIE_CFLAGS)
AC_SUBST(PIE_LDFLAGS)
# Check for -Wl,--gc-sections
AC_MSG_CHECKING([for ld that supports "-Wl,--gc-sections"])
AC_TRY_LINK([
int one(void) { return 1; }
int two(void) { return 2; }
], [ two(); ] , [ac_gcsections=yes], [ac_gcsections=no])
if test "$ac_gcsections" = "yes"; then
rm -f conftest.c
touch conftest.c
if $CC -c conftest.c; then
ld_out=`$LD --gc-sections -o conftest conftest.o 2>&1`
ld_ret=$?
if test $ld_ret -ne 0 ; then
ac_gcsections=no
elif echo "$ld_out" | egrep 'option ignored|^usage:|illegal option' >/dev/null ; then
ac_gcsections=no
fi
fi
rm -f conftest.c conftest.o conftest
fi
if test "$ac_gcsections" = "yes"; then
if ld_supports_flag --gc-sections; then
SECTION_LDFLAGS="-Wl,--gc-sections $SECTION_LDFLAGS"
CFLAGS="-ffunction-sections -fdata-sections $CFLAGS"
fi
@ -316,8 +326,6 @@ case $target_os in
CFLAGS="$CFLAGS -D_POSIX_PTHREAD_SEMANTICS" ;;
esac
AM_PROG_LIBTOOL
changequote(,)dnl
# compress spaces in flags
CFLAGS=`echo "$CFLAGS" | sed -e 's/ +/ /g'`