diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2012-10-22 23:40:42 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2012-10-24 17:01:13 -0400 |
| commit | 0cae3f4b033e441d820f4521fa5736e4e6e4d713 (patch) | |
| tree | 6dcd02609d8d6100a9950924817db601d9815b10 /configure.in | |
| parent | de2b6422c641490b92b3130a519693166323423c (diff) | |
| download | glibc-0cae3f4b033e441d820f4521fa5736e4e6e4d713.tar.gz | |
change ifunc assembly test to a link test
The test currently tests the binutils frontend support which passes for
all versions of binutils we currently require (2.20+). It doesn't test
the backend which is required for ifunc to actually work, and which most
targets don't yet support.
Change the assembly code so that when we link it, we get a file that has
ifunc relocations if the backend supports it. That way we can test to
see if binutils supports everything we need.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/configure.in b/configure.in index b3fab3772b..4f7bc09842 100644 --- a/configure.in +++ b/configure.in @@ -23,6 +23,7 @@ AC_SUBST(cross_compiling) AC_PROG_CPP # We need the C++ compiler only for testing. AC_PROG_CXX +AC_CHECK_TOOL(READELF, readelf, false) if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then AC_MSG_ERROR([you must configure in a separate build directory]) @@ -566,17 +567,28 @@ if test "$base_machine" = "i386"; then AC_DEFINE(USE_REGPARMS) fi -# For the multi-arch option we need support in the assembler. -AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support], - libc_cv_asm_gnu_indirect_function, [dnl +# For the multi-arch option we need support in the assembler & linker. +AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support], + libc_cv_ld_gnu_indirect_function, [dnl cat > conftest.s <<EOF .type foo,%gnu_indirect_function +foo: +.globl _start +_start: +.globl __start +__start: +.data +.long foo EOF -if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; -then - libc_cv_asm_gnu_indirect_function=yes -else - libc_cv_asm_gnu_indirect_function=no +libc_cv_ld_gnu_indirect_function=no +if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \ + -nostartfiles -nostdlib \ + -o conftest conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then + # Do a link to see if the backend supports IFUNC relocs. + $READELF -r conftest 1>&AS_MESSAGE_LOG_FD + LC_ALL=C $READELF -r conftest | grep 'no relocations' >/dev/null || { + libc_cv_ld_gnu_indirect_function=yes + } fi rm -f conftest*]) @@ -596,7 +608,7 @@ else AC_MSG_RESULT(yes) fi -if test x"$libc_cv_asm_gnu_indirect_function" != xyes; then +if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then if test x"$multi_arch" = xyes; then AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support]) else @@ -930,7 +942,6 @@ AC_CHECK_PROG_VER(AWK, gawk, --version, [GNU Awk[^0-9]*\([0-9][0-9.]*\)], [[3-9].*], critic_missing="$critic_missing gawk") -AC_CHECK_TOOL(READELF, readelf, false) AC_CHECK_TOOL(NM, nm, false) AC_CHECK_PROGS(AUTOCONF, autoconf, no) |