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68 lines
2.7 KiB
Plaintext
68 lines
2.7 KiB
Plaintext
# SYNOPSIS
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#
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# MHD_CHECK_LINK_RUN(MESSAGE, CACHE_ID, COMMAND_IF_CROSS_COMPILING, INPUT,
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# [ACTION_IF_SUCCEED], [ACTION_IF_FAILED])
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#
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# DESCRIPTION
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#
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# Improved version of AC_RUN_IFELSE macro.
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# Unlike AC_RUN_IFELSE, this macro tries to link the code if cross-compiling.
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# Action COMMAND_IF_CROSS_COMPILING is executed only if link is succeed,
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# otherwise CACHE_ID variable set to "no".
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# COMMAND_IF_CROSS_COMPILING action must set CACHE_ID variable to "yes", "no",
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# "assuming yes" or "assuming no".
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# ACTION_IF_SUCCEED is executed if result is "yes" or "assuming yes".
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# ACTION_IF_FAILED is executed if result is "no" or "assuming no".
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#
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# Example usage:
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#
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# MHD_CHECK_LINK_RUN([for valid snprintf()], [mhd_cv_snprintf_valid],
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# AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
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# [if (4 != snprintf(NULL, 0, "test"))
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# return 2;])],
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# [mhd_cv_snprintf_valid='assuming no'])
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#
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#
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# LICENSE
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#
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# Copyright (c) 2022 Karlson2k (Evgeny Grin) <k2k@narod.ru>
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice
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# and this notice are preserved. This file is offered as-is, without any
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# warranty.
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#serial 1
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AC_DEFUN([MHD_CHECK_LINK_RUN],[dnl
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m4_ifblank([$1],[m4_fatal([$0: The first macro argument ("MESSAGE") must not be empty])])dnl
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m4_ifblank([$2],[m4_fatal([$0: The second macro argument ("CACHE_ID") must not be empty])])dnl
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m4_ifblank([$3],[m4_fatal([$0: The third macro argument ("COMMAND_IF_CROSS_COMPILING") ]dnl
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[must not be empty])])dnl
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m4_ifblank([$4],[m4_fatal([$0: The fourth macro argument ("INPUT") must not be empty])])dnl
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m4_bmatch(_mhd_norm_expd([$2]),[\s],dnl
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[m4_fatal([$0: The second macro argument ("CACHE_ID") must not contain whitespaces])])dnl
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m4_bmatch(_mhd_norm_expd([$3]),[\<]m4_re_escape(_mhd_norm_expd([$2]))[\>],[],dnl
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[m4_fatal([$0: The third macro argument ("COMMAND_IF_CROSS_COMPILING") must assign ]dnl
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[a value to the cache variable ']_mhd_norm_expd([$2])['])])dnl
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m4_pushdef([cacheVar],_mhd_norm_expd([$2]))dnl
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AC_CACHE_CHECK([$1],[$2],
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[
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AC_LANG_CONFTEST([$4])
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AS_VAR_IF([cross_compiling],["yes"],
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[AC_LINK_IFELSE([],[
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$3
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],[cacheVar='no'])dnl AC_LINK_IFELSE
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],dnl
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[AC_RUN_IFELSE([],[cacheVar='yes'],[cacheVar='no'],[[# Dummy placeholder]])
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])
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rm -f conftest.$ac_ext
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])
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m4_ifnblank([$5],[
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AS_IF([test "x$cacheVar" = "xyes" || test "x$cacheVar" = "xassuming yes"],[$5])dnl AS_IF
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])dnl m4_ifnblank
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m4_ifnblank([$6],[
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AS_IF([test "x$cacheVar" = "xno" || test "x$cacheVar" = "xassuming no"],[$6])dnl AS_IF
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])dnl m4_ifnblank
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])dnl AC_DEFUN
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