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# SYNOPSIS
#
# MHD_CHECK_FUNC([FUNCTION_NAME],
# [INCLUDES=AC_INCLUDES_DEFAULT], [CHECK_CODE],
# [ACTION-IF-AVAILABLE], [ACTION-IF-NOT-AVAILABLE],
# [ADDITIONAL_LIBS])
#
# DESCRIPTION
#
# This macro checks for presence of specific function by including
# specified headers and compiling and linking CHECK_CODE.
# This checks both declaration and presence in library.
# If function is available then macro HAVE_function_name (the name
# of the function convetedd to all uppercase characters) is defined
# automatically.
# Unlike AC_CHECK_FUNCS macro, this macro do not produce false
# negative result if function is declared with specific calling
# conventions like __stdcall' or attribute like
# __attribute__((__dllimport__)) and linker failing to build test
# program due to the different calling conventions.
# By using definition from provided headers, this macro ensures that
# correct calling convention is used for detection.
#
# Example usage:
#
# MHD_CHECK_FUNC([memmem],
# [[#include <string.h>]],
# [const void *ptr = memmem("aa", 2, "a", 1); (void)ptr;],
# [var_use_memmem='yes'], [var_use_memmem='no'])
#
# The cache variable used in check so if any test will not work
# correctly on some platform, user may simply fix it by giving cache
# variable in configure parameters, for example:
#
# ./configure mhd_cv_func_memmem_have=no
#
# This simplifies building from source on exotic platforms as patching
# of configure.ac is not required to change results of tests.
#
# LICENSE
#
# Copyright (c) 2019-2023 Karlson2k (Evgeny Grin) <k2k@narod.ru>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
#serial 5
AC_DEFUN([MHD_CHECK_FUNC],[dnl
AC_PREREQ([2.64])dnl for AS_VAR_IF, m4_ifblank, m4_ifnblank
m4_newline([[# Expansion of $0 macro starts here]])
AC_LANG_ASSERT([C])dnl
m4_ifblank(m4_translit([$1],[()],[ ]), [m4_fatal([First macro argument must not be empty])])dnl
m4_ifblank([$3], [m4_fatal([Third macro argument must not be empty])])dnl
m4_bmatch(m4_normalize([$1]), [\s],dnl
[m4_fatal([First macro argument must not contain whitespaces])])dnl
m4_if(m4_index([$3], m4_normalize(m4_translit([$1],[()],[ ]))), [-1], dnl
[m4_fatal([CHECK_CODE parameter (third macro argument) does not contain ']m4_normalize([$1])[' token])])dnl
AS_VAR_PUSHDEF([decl_cv_Var],[ac_cv_have_decl_]m4_bpatsubst(_mhd_norm_expd(m4_translit([$1],[()],[ ])),[[^a-zA-Z0-9]],[_]))dnl
AS_VAR_PUSHDEF([cv_Var],[mhd_cv_func_]m4_bpatsubst(_mhd_norm_expd(m4_translit([$1],[()],[ ])),[[^a-zA-Z0-9]],[_]))dnl
AS_VAR_SET_IF([cv_Var],[],[AC_CHECK_DECL(_mhd_norm_expd([$1]),[],[],[$2])])
AC_CACHE_CHECK([for function $1], [cv_Var],dnl
[dnl
AS_VAR_IF([decl_cv_Var],["yes"],dnl
[dnl
m4_ifnblank([$6],[dnl
mhd_check_func_SAVE_LIBS="$LIBS"
LIBS="_mhd_norm_expd([$6]) $LIBS"
])dnl
AC_LINK_IFELSE(
[AC_LANG_SOURCE([
m4_default_nblank([$2],[AC_INCLUDES_DEFAULT])
[int main(void)
{
]$3[
return 0;
}
]])
],
[AS_VAR_SET([cv_Var],["yes"])],
[AS_VAR_SET([cv_Var],["no"])]dnl
)
m4_ifnblank([$6],[dnl
LIBS="${mhd_check_func_SAVE_LIBS}"
AS_UNSET([mhd_check_func_SAVE_LIBS])
])dnl
],[AS_VAR_SET([cv_Var],["no"])]dnl
)dnl
]dnl
)
AS_VAR_IF([cv_Var], ["yes"],
[AC_DEFINE([[HAVE_]]m4_bpatsubst(m4_toupper(_mhd_norm_expd(m4_translit([$1],[()],[ ]))),[[^A-Z0-9]],[_]),
[1], [Define to 1 if you have the ']_mhd_norm_expd(m4_translit([$1],[()],[ ]))[' function.])
m4_n([$4])dnl
],[$5])
AS_VAR_POPDEF([cv_Var])dnl
AS_VAR_POPDEF([decl_cv_Var])dnl
m4_newline([[# Expansion of $0 macro ends here]])
])dnl AC_DEFUN MHD_CHECK_FUNC
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