mhd_check_func.m4 (4017B)
1 # SYNOPSIS 2 # 3 # MHD_CHECK_FUNC([FUNCTION_NAME], 4 # [INCLUDES=AC_INCLUDES_DEFAULT], [CHECK_CODE], 5 # [ACTION-IF-AVAILABLE], [ACTION-IF-NOT-AVAILABLE], 6 # [ADDITIONAL_LIBS]) 7 # 8 # DESCRIPTION 9 # 10 # This macro checks for presence of specific function by including 11 # specified headers, checking for declaration of the function and then 12 # compiling and linking CHECK_CODE. 13 # This checks both declaration and presence in library. 14 # If function is available then macro HAVE_function_name (the name 15 # of the function conveted to all uppercase characters) is defined 16 # automatically. 17 # Unlike AC_CHECK_FUNCS macro, this macro do not produce false 18 # negative result if function is declared with specific calling 19 # conventions like __stdcall' or attribute like 20 # __attribute__((__dllimport__)) and linker failing to build test 21 # program due to the different calling conventions. 22 # By using definition from provided headers, this macro ensures that 23 # correct calling convention is used for detection. 24 # 25 # Example usage: 26 # 27 # MHD_CHECK_FUNC([memmem], 28 # [[#include <string.h>]], 29 # [const void *ptr = memmem("aa", 2, "a", 1); (void)ptr;], 30 # [var_use_memmem='yes'], [var_use_memmem='no']) 31 # 32 # The cache variable used in check so if any test will not work 33 # correctly on some platform, user may simply fix it by giving cache 34 # variable in configure parameters, for example: 35 # 36 # ./configure mhd_cv_have_func_memmem=no 37 # 38 # This simplifies building from source on exotic platforms as patching 39 # of configure.ac is not required to change the results of the tests. 40 # 41 # LICENSE 42 # 43 # Copyright (c) 2019-2023 Karlson2k (Evgeny Grin) <k2k@narod.ru> 44 # 45 # Copying and distribution of this file, with or without modification, are 46 # permitted in any medium without royalty provided the copyright notice 47 # and this notice are preserved. This file is offered as-is, without any 48 # warranty. 49 50 #serial 6 51 52 AC_DEFUN([MHD_CHECK_FUNC],[dnl 53 AC_PREREQ([2.64])dnl for AS_VAR_IF, m4_ifblank, m4_ifnblank 54 m4_newline([[# Expansion of $0 macro starts here]]) 55 AC_LANG_ASSERT([C])dnl 56 m4_ifblank(m4_translit([$1],[()],[ ]), [m4_fatal([First macro argument must not be empty])])dnl 57 m4_ifblank([$3], [m4_fatal([Third macro argument must not be empty])])dnl 58 m4_bmatch(m4_normalize([$1]), [\s],dnl 59 [m4_fatal([First macro argument must not contain whitespaces])])dnl 60 m4_if(m4_index([$3], m4_normalize(m4_translit([$1],[()],[ ]))), [-1], dnl 61 [m4_fatal([CHECK_CODE parameter (third macro argument) does not contain ']m4_normalize([$1])[' token])])dnl 62 AS_VAR_PUSHDEF([decl_cv_Var],[ac_cv_have_decl_]m4_bpatsubst(_mhd_norm_expd(m4_translit([$1],[()],[ ])),[[^a-zA-Z0-9]],[_]))dnl 63 AS_VAR_PUSHDEF([cv_Var],[mhd_cv_have_func_]m4_bpatsubst(_mhd_norm_expd(m4_translit([$1],[()],[ ])),[[^a-zA-Z0-9]],[_]))dnl 64 AS_VAR_SET_IF([cv_Var],[],[AC_CHECK_DECL(_mhd_norm_expd([$1]),[],[cv_Var="no"],[$2])]) 65 AC_CACHE_CHECK([f][or function $1], [cv_Var],dnl 66 [dnl 67 m4_ifnblank([$6],[dnl 68 mhd_check_func_SAVE_LIBS="$LIBS" 69 LIBS="_mhd_norm_expd([$6]) $LIBS" 70 ])dnl 71 AC_LINK_IFELSE( 72 [AC_LANG_SOURCE([ 73 m4_default_nblank([$2],[AC_INCLUDES_DEFAULT]) 74 75 [int main(void) 76 { 77 78 ]$3[ 79 80 return 0; 81 } 82 ]]) 83 ], 84 [AS_VAR_SET([cv_Var],["yes"])], 85 [AS_VAR_SET([cv_Var],["no"])]dnl 86 ) 87 m4_ifnblank([$6],[dnl 88 LIBS="${mhd_check_func_SAVE_LIBS}" 89 AS_UNSET([mhd_check_func_SAVE_LIBS]) 90 ])dnl 91 ],[AS_VAR_SET([cv_Var],["no"])]dnl 92 ) 93 AS_VAR_IF([cv_Var], ["yes"], 94 [AC_DEFINE([[HAVE_]]m4_bpatsubst(m4_toupper(_mhd_norm_expd(m4_translit([$1],[()],[ ]))),[[^A-Z0-9]],[_]), 95 [1], [Define to 1 if you have the ']_mhd_norm_expd(m4_translit([$1],[()],[ ]))[' function.]) 96 m4_n([$4])dnl 97 ],[$5]) 98 AS_VAR_POPDEF([cv_Var])dnl 99 AS_VAR_POPDEF([decl_cv_Var])dnl 100 m4_newline([[# Expansion of $0 macro ends here]]) 101 ])dnl AC_DEFUN MHD_CHECK_FUNC