diff options
Diffstat (limited to 'm4/wmemcmp.m4')
| -rw-r--r-- | m4/wmemcmp.m4 | 49 |
1 files changed, 48 insertions, 1 deletions
diff --git a/m4/wmemcmp.m4 b/m4/wmemcmp.m4 index 534dde10cc..c804dc8a4a 100644 --- a/m4/wmemcmp.m4 +++ b/m4/wmemcmp.m4 @@ -1,4 +1,4 @@ -# wmemcmp.m4 serial 5 +# wmemcmp.m4 serial 6 dnl Copyright (C) 2011-2023 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -7,6 +7,7 @@ dnl with or without modifications, as long as this notice is preserved. AC_DEFUN([gl_FUNC_WMEMCMP], [ AC_REQUIRE([gl_WCHAR_H_DEFAULTS]) + AC_REQUIRE([AC_CANONICAL_HOST]) dnl We cannot use AC_CHECK_FUNCS here, because the MSVC 9 header files dnl provide this function as an inline function definition. AC_CACHE_CHECK([for wmemcmp], [gl_cv_func_wmemcmp], @@ -21,5 +22,51 @@ AC_DEFUN([gl_FUNC_WMEMCMP], ]) if test $gl_cv_func_wmemcmp = no; then HAVE_WMEMCMP=0 + else + AC_CACHE_CHECK([whether wmemcmp works for all wide characters], + [gl_cv_func_wmemcmp_works], + [AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ + #include <wchar.h> + int main () + { + wchar_t a = (wchar_t) 0x76547654; + wchar_t b = (wchar_t) 0x9abc9abc; + int cmp = wmemcmp (&a, &b, 1); + if ((wchar_t)-1 < 0) + return !(cmp > 0); + else + return !(cmp < 0); + } + ]]) + ], + [gl_cv_func_wmemcmp_works=yes], + [gl_cv_func_wmemcmp_works=no], + [case "$host_on" in + # Guess no on glibc versions < 2.15. + *-gnu* | gnu*) + AC_EGREP_CPP([Unlucky], + [ +#include <features.h> +#ifdef __GNU_LIBRARY__ + #if (__GLIBC__ == 2 && __GLIBC_MINOR__ < 15) + Unlucky GNU user + #endif +#endif + ], + [gl_cv_func_wmemcmp_works="guessing no"], + [gl_cv_func_wmemcmp_works="guessing yes"]) + ;; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_wmemcmp_works="guessing no" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_wmemcmp_works="$gl_cross_guess_normal" ;; + esac + ]) + ]) + case "$gl_cv_func_wmemcmp_works" in + *yes) ;; + *) REPLACE_WMEMCMP=1 ;; + esac fi ]) |