diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 92a6cc6120..9eec2e9fa2 100644 --- a/configure.in +++ b/configure.in @@ -940,6 +940,33 @@ if test "$GCC" = yes; then # various headers. Most frequent situation is the use of // # comments. We bypass ANSI C mode for them. Otherwise # extension libs cannot include those headers. + + # Since math.h in some mingw64 wrongly delcares frexp and modf + # to be pure, the variables pointed by the second arguments are + # considered uninitialized unexpectedly. + AC_CACHE_CHECK([whether frexp and modf are broken], + rb_cv_mingw64_broken_frexp_modf, + [ + save_CFLAGS="$CFLAGS" + if test "$particular_werror_flags" = "yes"; then + CFLAGS="$CFLAGS -Werror=uninitialized" + else + CFLAGS="$CFLAGS -Werror -Wuninitialized" + fi + AC_TRY_COMPILE([@%:@include <math.h> + int foo(double x) + { + int exp; + frexp(x, &exp); + return exp; + }], [if (foo(0.0)) return 1;], + [rb_cv_mingw64_broken_frexp_modf=no], + [rb_cv_mingw64_broken_frexp_modf=yes]) + CFLAGS="$save_CFLAGS" + ]) + if test "$rb_cv_mingw64_broken_frexp_modf" = yes; then + AC_DEFINE(RUBY_MINGW64_BROKEN_FREXP_MODF) + fi ], [cygwin*|darwin*|netbsd*|nacl], [ # need lgamma_r(), finite() |