diff options
Diffstat (limited to 'sysdeps/s390/configure.ac')
| -rw-r--r-- | sysdeps/s390/configure.ac | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/sysdeps/s390/configure.ac b/sysdeps/s390/configure.ac index 59cfdd1..493e9a4 100644 --- a/sysdeps/s390/configure.ac +++ b/sysdeps/s390/configure.ac @@ -10,5 +10,31 @@ AC_CHECK_PROG_VER(AS, $AS, --version, [GNU assembler.* \([0-9]*\.[0-9.]*\)], [2.2[4-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing The program AS is required in version >= 2.24 for target S390.") + +AC_CACHE_CHECK(for __builtin_tbegin, libc_cv_gcc_builtin_tbegin, [dnl +cat > conftest.c <<\EOF +#include <htmintrin.h> +void testtransaction () +{ + if (__builtin_tbegin (0) == _HTM_TBEGIN_STARTED) + { + __builtin_tend (); + } +} +EOF +dnl +dnl test, if the tbegin instruction is used by __builtin_tbegin +if AC_TRY_COMMAND([${CC-cc} -mhtm -O2 -S conftest.c -o - | grep -w tbegin > /dev/null]) ; +then + libc_cv_gcc_builtin_tbegin=yes +else + libc_cv_gcc_builtin_tbegin=no +fi +rm -f conftest* ]) + +if test "$enable_lock_elision" = yes && test "$libc_cv_gcc_builtin_tbegin" = no ; then + critic_missing="$critic_missing The used GCC has no support for __builtin_tbegin, which is needed for lock-elision on target S390." +fi + test -n "$critic_missing" && AC_MSG_ERROR([ *** $critic_missing]) |