mhd_find_add_cc_cflag.m4 (3671B)
1 # SYNOPSIS 2 # 3 # MHD_FIND_ADD_CC_CFLAG([VARIABLE-TO-EXTEND], 4 # [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...) 5 # 6 # DESCRIPTION 7 # 8 # This macro checks whether the specific compiler flags are supported. 9 # The flags are checked one-by-one. The checking is stopped when the first 10 # supported flag found. 11 # The checks are performing by appending FLAGx-TO-TEST to the value of 12 # VARIABLE-TO-EXTEND (CFLAGS if not specified), then prepending result to 13 # CFLAGS (unless VARIABLE-TO-EXTEND is CFLAGS), and then performing compile 14 # and link test. If test succeed without warnings, then the flag is added to 15 # VARIABLE-TO-EXTEND and next flags are not checked. If compile-link cycle 16 # cannot be performed without warning with all tested flags, no flag is 17 # added to the VARIABLE-TO-EXTEND. 18 # 19 # Example usage: 20 # 21 # MHD_CHECK_CC_CFLAG([additional_CFLAGS], 22 # [-ggdb3], [-g3], [-ggdb], [-g]) 23 # 24 # Note: Unlike others MHD_CHECK_*CC_CFLAG* macro, this macro uses another 25 # order of parameters. 26 # 27 # LICENSE 28 # 29 # Copyright (c) 2022 Karlson2k (Evgeny Grin) <k2k@narod.ru> 30 # 31 # Copying and distribution of this file, with or without modification, are 32 # permitted in any medium without royalty provided the copyright notice 33 # and this notice are preserved. This file is offered as-is, without any 34 # warranty. 35 36 #serial 2 37 38 AC_DEFUN([MHD_FIND_ADD_CC_CFLAG],[dnl 39 _MHD_FIND_ADD_CC_XFLAG([[CFLAGS]],[],[],$@)]) 40 41 42 # SYNOPSIS 43 # 44 # _MHD_FIND_ADD_CC_XFLAG([CFLAGS|LDFLAGS], 45 # [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND], 46 # [VARIABLE-TO-EXTEND], 47 # [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...) 48 # 49 AC_DEFUN([_MHD_FIND_ADD_CC_XFLAG],[dnl 50 AC_PREREQ([2.64])dnl for m4_ifnblank 51 AC_LANG_ASSERT([C])dnl 52 m4_if(m4_eval([$# >= 5]), [0], [m4_fatal([$0: Macro must have at least five parameters])])dnl 53 m4_ifblank([$5],[m4_fatal([$0: Fifth macro argument must not be empty])])dnl 54 m4_ifnblank([$2$3],[m4_newline([m4_n([AS_UNSET([mhd_cc_found_flag])])])])dnl 55 m4_bmatch(_mhd_norm_expd([$1]), [^\(CFLAGS\|LDFLAGS\)$],[],dnl 56 [m4_fatal([$0: First macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$1])[' is not supported])])dnl 57 m4_ifnblank([$4],[_MHD_FIND_ADD_CC_XFLAG_BODY(m4_ifnblank([$2$3],[mhd_cc_found_flag]),[$1],[$4],m4_shiftn([4],$@))],dnl 58 [_MHD_FIND_ADD_CC_XFLAG_BODY(m4_ifnblank([$2$3],[mhd_cc_found_flag]),[$1],[$1],m4_shiftn([4],$@))])dnl 59 m4_ifnblank([$2$3],[ 60 AS_IF([test -n "${mhd_cc_found_flag}"],[$2],[$3]) 61 AS_UNSET([mhd_cc_found_flag]) 62 ])dnl 63 ])dnl 64 ]) 65 66 67 # SYNOPSIS 68 # 69 # _MHD_FIND_ADD_CC_XFLAG_BODY([VAR-TO-SET], 70 # [CFLAGS|LDFLAGS], 71 # [VARIABLE-TO-EXTEND], 72 # [FLAG1-TO-TEST], [FLAG2-TO-TEST], ...) 73 # 74 m4_define([_MHD_FIND_ADD_CC_XFLAG_BODY],[dnl 75 m4_version_prereq([2.64])dnl for m4_ifnblank 76 m4_if([$#],[0],[m4_fatal([$0: no parameters])])dnl 77 m4_bmatch(_mhd_norm_expd([$2]),[^\(CFLAGS\|LDFLAGS\)$],[],dnl 78 [m4_fatal([$0: Second macro argument must be either 'CFLAGS' or 'LDFLAGS; ']_mhd_norm_expd([$2])[' is not supported])])dnl 79 m4_if([$#],[1],[m4_fatal([$0: not enough parameters])])dnl 80 m4_if([$#],[2],[m4_fatal([$0: not enough parameters])])dnl 81 m4_if([$#],[3],[m4_fatal([$0: not enough parameters])])dnl 82 m4_if([$#],[4],[m4_ifnblank([$4],[_MHD_CHECK_ADD_CC_XFLAG([$4],[$3],m4_ifnblank([$1],[$1="_mhd_norm_expd([$4])"]),[],[$2])])], 83 [m4_ifnblank([$4],[_MHD_CHECK_ADD_CC_XFLAG([$4],[$3],m4_ifnblank([$1],[$1="_mhd_norm_expd([$4])"]),[$0([$1],[$2],[$3],m4_shiftn([4],$@))],[$2])], 84 [$0([$1],[$2],[$3],m4_shiftn([4],$@))])])dnl 85 ])