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This version of the AX_CFLAGS_WARN_ALL macro uses a far more robust method of detecting compilers to select appropriate warning flags. It also uses the AX_PREPEND_FLAG macro instead of AX_APPEND_FLAG. This version of ax_cflags_warn_all.m4 (and ax_prepend_flag.m4) has been submitted upstream; see https://savannah.gnu.org/patch/?9673 for details.
52 lines
1.6 KiB
Plaintext
52 lines
1.6 KiB
Plaintext
# ===========================================================================
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# https://www.gnu.org/software/autoconf-archive/ax_prepend_flag.html
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# ===========================================================================
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#
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# SYNOPSIS
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#
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# AX_PREPEND_FLAG(FLAG, [FLAGS-VARIABLE])
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#
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# DESCRIPTION
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#
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# FLAG is added to the front of the FLAGS-VARIABLE shell variable, with a
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# space added in between.
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#
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# If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
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# CFLAGS) is used. FLAGS-VARIABLE is not changed if it already contains
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# FLAG. If FLAGS-VARIABLE is unset in the shell, it is set to exactly
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# FLAG.
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#
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# NOTE: Implementation based on AX_APPEND_FLAG.
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#
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# LICENSE
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#
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# Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
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# Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
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# Copyright (c) 2018 John Zaitseff <J.Zaitseff@zap.org.au>
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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([AX_PREPEND_FLAG],
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[dnl
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AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
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AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
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AS_VAR_SET_IF(FLAGS,[
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AS_CASE([" AS_VAR_GET(FLAGS) "],
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[*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
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[
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FLAGS="$1 $FLAGS"
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AC_RUN_LOG([: FLAGS="$FLAGS"])
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])
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],
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[
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AS_VAR_SET(FLAGS,[$1])
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AC_RUN_LOG([: FLAGS="$FLAGS"])
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])
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AS_VAR_POPDEF([FLAGS])dnl
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])dnl AX_PREPEND_FLAG
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