diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/configure.in b/configure.in index 5299146cdd..9c627c5611 100644 --- a/configure.in +++ b/configure.in @@ -1065,8 +1065,9 @@ EOF AC_CACHE_CHECK(for -z combreloc, libc_cv_z_combreloc, [dnl cat > conftest.c <<EOF -extern int bar (void); -int foo (void) { return bar (); } +extern int bar (int); +extern int mumble; +int foo (void) { return bar (mumble); } EOF if AC_TRY_COMMAND([${CC-cc} -shared -o conftest.so conftest.c -nostdlib -nostartfiles @@ -1398,6 +1399,25 @@ if test "$libc_cv_gcc_builtin_expect" = yes; then AC_DEFINE(HAVE_BUILTIN_EXPECT) fi +AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl +cat > conftest.c <<\EOF +void zero (void *x) +{ + __builtin_memset (x, 0, 4); +} +EOF +dnl +if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]); +then + libc_cv_gcc_builtin_memset=no +else + libc_cv_gcc_builtin_memset=yes +fi +rm -f conftest* ]) +if test "$libc_cv_gcc_builtin_memset" = yes ; then + AC_DEFINE(HAVE_BUILTIN_MEMSET) +fi + dnl Check whether the compiler supports subtraction of local labels. AC_CACHE_CHECK(for local label subtraction, libc_cv_gcc_subtract_local_labels, [cat > conftest.c <<EOF |