mirror of
git://sourceware.org/git/glibc.git
synced 2024-11-21 01:12:26 +08:00
7c7bcf3634
Teach the linker that __mcount_internal, __sigjmp_save_symbol, __syscall_error and __GI_exit do not use r2, so that it does not need to recover r2 after the call. Test at configure time if the assembler supports @notoc and define USE_PPC64_NOTOC.
35 lines
1.1 KiB
Plaintext
35 lines
1.1 KiB
Plaintext
GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
|
|
# Local configure fragment for sysdeps/powerpc/powerpc64.
|
|
|
|
AC_CACHE_CHECK(for support for overlapping .opd entries,
|
|
libc_cv_overlapping_opd, [dnl
|
|
libc_cv_overlapping_opd=no
|
|
echo 'void foo (void) {}' > conftest.c
|
|
if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
|
|
changequote(,)dnl
|
|
if grep '\.TOC\.@tocbase' conftest.s > /dev/null; then
|
|
if grep '\.TOC\.@tocbase[ ]*,[ ]*0' conftest.s > /dev/null; then
|
|
:
|
|
else
|
|
libc_cv_overlapping_opd=yes
|
|
fi
|
|
fi
|
|
changequote([,])dnl
|
|
fi
|
|
rm -f conftest.c conftest.s
|
|
])
|
|
if test x$libc_cv_overlapping_opd = xyes; then
|
|
AC_DEFINE(USE_PPC64_OVERLAPPING_OPD)
|
|
fi
|
|
|
|
# @notoc started to be supported in GNU Binutils 2.31.
|
|
AC_CACHE_CHECK([if the assembler supports @notoc],
|
|
libc_cv_ppc64_notoc, [
|
|
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
|
|
void foo (void) {asm("b foo@notoc");}
|
|
])],
|
|
[libc_cv_ppc64_notoc=yes],
|
|
[libc_cv_ppc64_notoc=no])])
|
|
AS_IF([test x$libc_cv_ppc64_notoc = xyes],
|
|
[AC_DEFINE(USE_PPC64_NOTOC)])
|