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| author | Ian Lynagh <igloo@earth.li> | 2007-01-15 19:42:50 +0000 |
|---|---|---|
| committer | Ian Lynagh <igloo@earth.li> | 2007-01-15 19:42:50 +0000 |
| commit | 50ebea6a8607f4d83dd2d8d99acf9a55e4d39349 (patch) | |
| tree | 5474b73f02c487258fd1ddde2876f4963409f7d1 /aclocal.m4 | |
| parent | 85c2ef54a48b12bb7bef0e841e4948fae13d7242 (diff) | |
| download | haskell-50ebea6a8607f4d83dd2d8d99acf9a55e4d39349.tar.gz | |
Give -fwrapv to gcc when it supports it
Fixes trac #952: Haskell requires consistent overflow behaviour, which
gcc doesn't give without this flag.
Diffstat (limited to 'aclocal.m4')
| -rw-r--r-- | aclocal.m4 | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/aclocal.m4 b/aclocal.m4 index 86fdeaf76f..36c0128b7b 100644 --- a/aclocal.m4 +++ b/aclocal.m4 @@ -954,6 +954,18 @@ if test "$fp_cv_gcc_has_no_unit_at_a_time" = "yes"; then AC_DEFINE([HAVE_GCC_HAS_NO_UNIT_AT_A_TIME], [1], [Define to 1 if gcc supports -fno-unit-at-a-time.]) fi]) +# FP_GCC_HAS_WRAPV +# -------------------------- +AC_DEFUN([FP_GCC_HAS_WRAPV], +[AC_REQUIRE([FP_HAVE_GCC]) +AC_CACHE_CHECK([whether gcc has -fwrapv], [fp_cv_gcc_has_wrapv], +[FP_COMPARE_VERSIONS([$fp_gcc_version], [-ge], [3.4], + [fp_cv_gcc_has_wrapv=yes], + [fp_cv_gcc_has_wrapv=no])]) +if test "$fp_cv_gcc_has_wrapv" = "yes"; then + AC_DEFINE([HAVE_GCC_HAS_WRAPV], [1], [Define to 1 if gcc supports -fwrapv.]) +fi]) + # FP_SETUP_PROJECT_VERSION # --------------------- AC_DEFUN([FP_SETUP_PROJECT_VERSION], |