diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 6b57c8db07..80d45f041b 100644 --- a/configure.in +++ b/configure.in @@ -2196,6 +2196,14 @@ if test "$libc_cv_gcc_tls_model_attr" = no; then AC_MSG_ERROR([support for the tls_model attribute is required]) fi +dnl Determine how to disable generation of FMA instructions. +AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions], + libc_cv_cc_nofma, [dnl +libc_cv_cc_nofma= +for opt in -ffp-contract=off -mno-fused-madd; do + LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break]) +done]) + if test -n "$submachine"; then AC_CACHE_CHECK([for compiler option for CPU variant], libc_cv_cc_submachine, [dnl @@ -2340,6 +2348,7 @@ AC_SUBST(libc_cv_cc_avx) AC_SUBST(libc_cv_cc_sse2avx) AC_SUBST(libc_cv_cc_novzeroupper) AC_SUBST(libc_cv_cc_fma4) +AC_SUBST(libc_cv_cc_nofma) AC_SUBST(libc_cv_as_i686) AC_SUBST(use_ldconfig) |