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# SYNOPSIS
#
# MHD_FIND_LIB([FUNCTION_NAME],
# [INCLUDES=AC_INCLUDES_DEFAULT], [CHECK_CODE],
# [LIBS_TO_CHECK],
# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND],
# [VAR_TO_PREPEND_LIB=LIBS], [ADDITIONAL_LIBS])
#
# DESCRIPTION
#
# This macro checks for presence of specific function by including
# specified headers and compiling and linking CHECK_CODE.
# This checks both the declaration and the presence in library.
# If declaration is not found in headers then libraries are not
# checked.
# LIBS_TO_CHECK is whitespace-separated list of libraries to check.
# The macro first tries to link without any library, and if it fails
# the libraries are checked one by one.
# The required library (if any) prepended to VAR_TO_PREPEND_LIB (or
# to the LIBS variable if VAR_TO_APPEND_LIB is not specified).
# By using definition from provided headers, this macro ensures that
# correct calling convention is used for detection.
#
# Example usage:
#
# MHD_FIND_LIB([clock_gettime],
# [[#include <time.h>]],
# [[struct timespec tp;
# if (0 > clock_gettime(CLOCK_REALTIME, &tp)) return 3;]],
# [rt],
# [var_use_gettime='yes'],[var_use_gettime='no'])
#
# Defined cache variable used in the check so if any test will not
# work correctly on some platform, a user may simply fix it by giving
# cache variable in configure parameters, for example:
#
# ./configure mhd_cv_find_clock_gettime=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) 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 1
AC_DEFUN([MHD_FIND_LIB],[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 FUNCTION_NAME must not be empty])])dnl
m4_ifblank([$3], [m4_fatal([Third macro argument CHECK_CODE must not be empty])])dnl
m4_bmatch(m4_normalize([$1]), [\s],dnl
[m4_fatal([First macro argument FUNCTION_NAME 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
m4_bmatch([$7], [\$], [m4_fatal([$0: Seventh macro argument VAR_TO_PREPEND_LIB must not contain '$'])])dnl
_MHD_FIND_LIB_BODY([$1],[$2],[$3],[$4],[$5],[$6],m4_default_nblank(_mhd_norm_expd([$7]),[LIBS]),[$8])dnl
])dnl AC_DEFUN MHD_FIND_LIB
# SYNOPSIS
#
# _MHD_FIND_LIB_BODY([1_FUNCTION_NAME],
# [2_INCLUDES=AC_INCLUDES_DEFAULT], [3_CHECK_CODE],
# [4_LIBS_TO_CHECK],
# [5_ACTION-IF-FOUND], [6_ACTION-IF-NOT-FOUND],
# [7_VAR_TO_PREPEND_LIB=LIBS], [8_ADDITIONAL_LIBS])
AC_DEFUN([_MHD_FIND_LIB_BODY],[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_find_lib_]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 library containing function $1], [cv_Var],
[
AS_VAR_IF([decl_cv_Var],["yes"],dnl
[dnl
mhd_find_lib_SAVE_LIBS="$LIBS"
m4_if([$7],LIBS,[dnl
mhd_find_lib_CHECK_LIBS="_mhd_norm_expd([$8]) $LIBS"
],[dnl
mhd_find_lib_CHECK_LIBS="[$]$7 _mhd_norm_expd([$8]) $LIBS"
]
)
# Reuse the same source file
AC_LANG_CONFTEST(
[AC_LANG_SOURCE([
m4_default_nblank([$2],[AC_INCLUDES_DEFAULT])
[int main(void)
{
]$3[
return 0;
}
]])
]
)
for mhd_find_lib_LIB in '' $4
do
AS_IF([test -z "${mhd_find_lib_LIB}"],
[LIBS="${mhd_find_lib_CHECK_LIBS}"],
[LIBS="-l${mhd_find_lib_LIB} ${mhd_find_lib_CHECK_LIBS}"]
)
AC_LINK_IFELSE([],
[
AS_IF([test -z "${mhd_find_lib_LIB}"],
[AS_VAR_SET([cv_Var],["none required"])],
[AS_VAR_SET([cv_Var],["-l${mhd_find_lib_LIB}"])]
)
]
)
AS_VAR_SET_IF([cv_Var],[break])
done
AS_UNSET([mhd_find_lib_LIB])
rm -f conftest.$ac_ext
LIBS="${mhd_find_lib_SAVE_LIBS}"
AS_UNSET([mhd_find_lib_SAVE_LIBS])
]
)
AS_VAR_SET_IF([cv_Var],[:],[AS_VAR_SET([cv_Var],["no"])])
]
)
AS_IF([test "x${cv_Var}" != "xno"],
[dnl
AS_VAR_IF([cv_Var],["none required"],[:],
[
AS_IF([test -z "[$]$7"],[$7="${cv_Var}"],[$7="${cv_Var} [$]$7"])
]
)
m4_n([$5])dnl
],[m4_n([$6])])dnl AS_VAR_SET_IF cv_Var
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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