1# setlocale_null.m4 serial 5 2dnl Copyright (C) 2019-2022 Free Software Foundation, Inc. 3dnl This file is free software; the Free Software Foundation 4dnl gives unlimited permission to copy and/or distribute it, 5dnl with or without modifications, as long as this notice is preserved. 6 7AC_DEFUN([gl_FUNC_SETLOCALE_NULL], 8[ 9 AC_REQUIRE([AC_CANONICAL_HOST]) 10 AC_REQUIRE([gl_PTHREADLIB]) 11 AC_CHECK_HEADERS_ONCE([threads.h]) 12 13 AC_CACHE_CHECK([whether setlocale (LC_ALL, NULL) is multithread-safe], 14 [gl_cv_func_setlocale_null_all_mtsafe], 15 [case "$host_os" in 16 # Guess no on musl libc, macOS, FreeBSD, NetBSD, OpenBSD, AIX, Haiku, Cygwin. 17 *-musl* | darwin* | freebsd* | midnightbsd* | netbsd* | openbsd* | aix* | haiku* | cygwin*) 18 gl_cv_func_setlocale_null_all_mtsafe=no ;; 19 # Guess yes on glibc, HP-UX, IRIX, Solaris, native Windows. 20 *-gnu* | gnu* | hpux* | irix* | solaris* | mingw*) 21 gl_cv_func_setlocale_null_all_mtsafe=yes ;; 22 # If we don't know, obey --enable-cross-guesses. 23 *) 24 gl_cv_func_setlocale_null_all_mtsafe="$gl_cross_guess_normal" ;; 25 esac 26 ]) 27 dnl On platforms without multithreading, there is no issue. 28 case "$host_os" in 29 mingw*) ;; 30 *) 31 if test $gl_pthread_api = no && test $ac_cv_header_threads_h = no; then 32 gl_cv_func_setlocale_null_all_mtsafe="trivially yes" 33 fi 34 ;; 35 esac 36 case "$gl_cv_func_setlocale_null_all_mtsafe" in 37 *yes) SETLOCALE_NULL_ALL_MTSAFE=1 ;; 38 *) SETLOCALE_NULL_ALL_MTSAFE=0 ;; 39 esac 40 AC_DEFINE_UNQUOTED([SETLOCALE_NULL_ALL_MTSAFE], [$SETLOCALE_NULL_ALL_MTSAFE], 41 [Define to 1 if setlocale (LC_ALL, NULL) is multithread-safe.]) 42 43 dnl This is about a single category (not LC_ALL). 44 AC_CACHE_CHECK([whether setlocale (category, NULL) is multithread-safe], 45 [gl_cv_func_setlocale_null_one_mtsafe], 46 [case "$host_os" in 47 # Guess no on OpenBSD, AIX. 48 openbsd* | aix*) 49 gl_cv_func_setlocale_null_one_mtsafe=no ;; 50 # Guess yes on glibc, musl libc, macOS, FreeBSD, NetBSD, HP-UX, IRIX, Solaris, Haiku, Cygwin, native Windows. 51 *-gnu* | gnu* | *-musl* | darwin* | freebsd* | midnightbsd* | netbsd* | hpux* | irix* | solaris* | haiku* | cygwin* | mingw*) 52 gl_cv_func_setlocale_null_one_mtsafe=yes ;; 53 # If we don't know, obey --enable-cross-guesses. 54 *) 55 gl_cv_func_setlocale_null_one_mtsafe="$gl_cross_guess_normal" ;; 56 esac 57 ]) 58 dnl On platforms without multithreading, there is no issue. 59 case "$host_os" in 60 mingw*) ;; 61 *) 62 if test $gl_pthread_api = no && test $ac_cv_header_threads_h = no; then 63 gl_cv_func_setlocale_null_one_mtsafe="trivially yes" 64 fi 65 ;; 66 esac 67 case "$gl_cv_func_setlocale_null_one_mtsafe" in 68 *yes) SETLOCALE_NULL_ONE_MTSAFE=1 ;; 69 *) SETLOCALE_NULL_ONE_MTSAFE=0 ;; 70 esac 71 AC_DEFINE_UNQUOTED([SETLOCALE_NULL_ONE_MTSAFE], [$SETLOCALE_NULL_ONE_MTSAFE], 72 [Define to 1 if setlocale (category, NULL) is multithread-safe.]) 73 74 dnl Determine link dependencies of lib/setlocale_null.c and lib/setlocale-lock.c. 75 if test $SETLOCALE_NULL_ALL_MTSAFE = 0 || test $SETLOCALE_NULL_ONE_MTSAFE = 0; then 76 case "$host_os" in 77 mingw*) LIB_SETLOCALE_NULL= ;; 78 *) 79 gl_WEAK_SYMBOLS 80 case "$gl_cv_have_weak" in 81 *yes) LIB_SETLOCALE_NULL= ;; 82 *) LIB_SETLOCALE_NULL="$LIBPTHREAD" ;; 83 esac 84 ;; 85 esac 86 else 87 LIB_SETLOCALE_NULL= 88 fi 89 dnl LIB_SETLOCALE_NULL is expected to be '-pthread' or '-lpthread' on AIX 90 dnl with gcc or xlc, and empty otherwise. 91 AC_SUBST([LIB_SETLOCALE_NULL]) 92]) 93 94# Prerequisites of lib/setlocale-lock.c. 95AC_DEFUN([gl_PREREQ_SETLOCALE_LOCK], 96[ 97 gl_VISIBILITY 98]) 99