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80 lines
2.9 KiB
Plaintext
80 lines
2.9 KiB
Plaintext
# warnings.m4 serial 11
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dnl Copyright (C) 2008-2015 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Simon Josefsson
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# gl_AS_VAR_APPEND(VAR, VALUE)
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# ----------------------------
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# Provide the functionality of AS_VAR_APPEND if Autoconf does not have it.
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m4_ifdef([AS_VAR_APPEND],
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[m4_copy([AS_VAR_APPEND], [gl_AS_VAR_APPEND])],
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[m4_define([gl_AS_VAR_APPEND],
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[AS_VAR_SET([$1], [AS_VAR_GET([$1])$2])])])
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# gl_COMPILER_OPTION_IF(OPTION, [IF-SUPPORTED], [IF-NOT-SUPPORTED],
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# [PROGRAM = AC_LANG_PROGRAM()])
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# -----------------------------------------------------------------
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# Check if the compiler supports OPTION when compiling PROGRAM.
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#
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# FIXME: gl_Warn must be used unquoted until we can assume Autoconf
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# 2.64 or newer.
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AC_DEFUN([gl_COMPILER_OPTION_IF],
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[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
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AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
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AS_LITERAL_IF([$1],
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[m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
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[gl_positive="$1"
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case $gl_positive in
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-Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
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esac
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m4_pushdef([gl_Positive], [$gl_positive])])dnl
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AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
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gl_save_compiler_FLAGS="$gl_Flags"
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gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
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[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
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AC_LINK_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
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[AS_VAR_SET(gl_Warn, [yes])],
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[AS_VAR_SET(gl_Warn, [no])])
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gl_Flags="$gl_save_compiler_FLAGS"
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])
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AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
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m4_popdef([gl_Positive])dnl
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AS_VAR_POPDEF([gl_Flags])dnl
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AS_VAR_POPDEF([gl_Warn])dnl
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])
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# gl_UNKNOWN_WARNINGS_ARE_ERRORS
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# ------------------------------
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# Clang doesn't complain about unknown warning options unless one also
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# specifies -Wunknown-warning-option -Werror. Detect this.
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AC_DEFUN([gl_UNKNOWN_WARNINGS_ARE_ERRORS],
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[gl_COMPILER_OPTION_IF([-Werror -Wunknown-warning-option],
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[gl_unknown_warnings_are_errors='-Wunknown-warning-option -Werror'],
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[gl_unknown_warnings_are_errors=])])
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# gl_WARN_ADD(OPTION, [VARIABLE = WARN_CFLAGS],
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# [PROGRAM = AC_LANG_PROGRAM()])
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# ---------------------------------------------
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# Adds parameter to WARN_CFLAGS if the compiler supports it when
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# compiling PROGRAM. For example, gl_WARN_ADD([-Wparentheses]).
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#
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# If VARIABLE is a variable name, AC_SUBST it.
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AC_DEFUN([gl_WARN_ADD],
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[AC_REQUIRE([gl_UNKNOWN_WARNINGS_ARE_ERRORS])
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gl_COMPILER_OPTION_IF([$1],
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[gl_AS_VAR_APPEND(m4_if([$2], [], [[WARN_CFLAGS]], [[$2]]), [" $1"])],
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[],
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[$3])
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m4_ifval([$2],
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[AS_LITERAL_IF([$2], [AC_SUBST([$2])])],
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[AC_SUBST([WARN_CFLAGS])])dnl
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])
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# Local Variables:
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# mode: autoconf
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# End:
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