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Merge from gnulib.

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This incorporates:
2013-08-15 warnings: minor optimization
2013-08-15 warnings: check -Wfoo rather than -Wno-foo
This commit is contained in:
Paul Eggert 2013-08-18 22:23:05 -07:00
parent dab3a8d5fe
commit 51632863c2
2 changed files with 17 additions and 2 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2013-08-19 Paul Eggert <eggert@cs.ucla.edu>
Merge from gnulib, incorporating:
2013-08-15 warnings: minor optimization
2013-08-15 warnings: check -Wfoo rather than -Wno-foo
2013-08-15 Ken Brown <kbrown@cornell.edu>
* configure.ac (G_SLICE_ALWAYS_MALLOC): Update comment.

13
m4/warnings.m4
View file

@ -1,4 +1,4 @@
# warnings.m4 serial 8
# warnings.m4 serial 10
dnl Copyright (C) 2008-2013 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@ -25,15 +25,24 @@ m4_ifdef([AS_VAR_APPEND],
AC_DEFUN([gl_COMPILER_OPTION_IF],
[AS_VAR_PUSHDEF([gl_Warn], [gl_cv_warn_[]_AC_LANG_ABBREV[]_$1])dnl
AS_VAR_PUSHDEF([gl_Flags], [_AC_LANG_PREFIX[]FLAGS])dnl
AS_LITERAL_IF([$1],
[m4_pushdef([gl_Positive], m4_bpatsubst([$1], [^-Wno-], [-W]))],
[gl_positive="$1"
case $gl_positive in
-Wno-*) gl_positive=-W`expr "X$gl_positive" : 'X-Wno-\(.*\)'` ;;
esac
m4_pushdef([gl_Positive], [$gl_positive])])dnl
AC_CACHE_CHECK([whether _AC_LANG compiler handles $1], m4_defn([gl_Warn]), [
gl_save_compiler_FLAGS="$gl_Flags"
gl_AS_VAR_APPEND(m4_defn([gl_Flags]), [" $gl_unknown_warnings_are_errors $1"])
gl_AS_VAR_APPEND(m4_defn([gl_Flags]),
[" $gl_unknown_warnings_are_errors ]m4_defn([gl_Positive])["])
AC_COMPILE_IFELSE([m4_default([$4], [AC_LANG_PROGRAM([])])],
[AS_VAR_SET(gl_Warn, [yes])],
[AS_VAR_SET(gl_Warn, [no])])
gl_Flags="$gl_save_compiler_FLAGS"
])
AS_VAR_IF(gl_Warn, [yes], [$2], [$3])
m4_popdef([gl_Positive])dnl
AS_VAR_POPDEF([gl_Flags])dnl
AS_VAR_POPDEF([gl_Warn])dnl
])