diff options
Diffstat (limited to 'm4/wcsncmp.m4')
| -rw-r--r-- | m4/wcsncmp.m4 | 58 |
1 files changed, 57 insertions, 1 deletions
diff --git a/m4/wcsncmp.m4 b/m4/wcsncmp.m4 index 6253af3c22..4ef469f1ba 100644 --- a/m4/wcsncmp.m4 +++ b/m4/wcsncmp.m4 @@ -1,4 +1,4 @@ -# wcsncmp.m4 serial 2 +# wcsncmp.m4 serial 3 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, @@ -10,5 +10,61 @@ AC_DEFUN([gl_FUNC_WCSNCMP], AC_CHECK_FUNCS_ONCE([wcsncmp]) if test $ac_cv_func_wcsncmp = no; then HAVE_WCSNCMP=0 + else + AC_CACHE_CHECK([whether wcsncmp works for all wide characters], + [gl_cv_func_wcsncmp_works], + [AC_RUN_IFELSE( + [AC_LANG_SOURCE([[ + #include <wchar.h> + int main () + { + int result = 0; + { /* This test fails on glibc < 2.15, musl libc 1.2.3, macOS 12.5, + FreeBSD 13.2, NetBSD 9.0, OpenBSD 7.2, Solaris 11.4. */ + wchar_t a[2] = { (wchar_t) 0x76547654, 0 }; + wchar_t b[2] = { (wchar_t) 0x9abc9abc, 0 }; + int cmp = wcsncmp (a, b, 1); + if (!((wchar_t)-1 < 0 ? cmp > 0 : cmp < 0)) + result |= 1; + } + { /* This test fails on AIX in 64-bit mode. */ + wchar_t c[2] = { (wchar_t) 'x', 0 }; + wchar_t d[3] = { (wchar_t) 'x', (wchar_t) 0x9abc9abc, 0 }; + int cmp = wcsncmp (c, d, 2); + if (!((wchar_t)-1 < 0 ? cmp > 0 : cmp < 0)) + result |= 2; + } + return result; + } + ]]) + ], + [gl_cv_func_wcsncmp_works=yes], + [gl_cv_func_wcsncmp_works=no], + [case "$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_wcsncmp_works="guessing no"], + [gl_cv_func_wcsncmp_works="guessing yes"]) + ;; + # Guess no on musl systems. + *-musl* | midipix*) gl_cv_func_wcsncmp_works="guessing no" ;; + # If we don't know, obey --enable-cross-guesses. + *) gl_cv_func_wcsncmp_works="$gl_cross_guess_normal" ;; + esac + ]) + ]) + case "$gl_cv_func_wcsncmp_works" in + *yes) ;; + *) REPLACE_WCSNCMP=1 ;; + esac fi ]) |