configure: new option --enable-gcc-warnings

I have been using this change for many months in my private copy
of Emacs, and have used it to find several bugs.  It's mature
enough to publish now.
* Makefile.in (GNULIB_MODULES): Add warnings, manywarnings.
* configure.in: Support --enable-gcc-warnings, in the style of
other GNU packages such as coreutils.
(C_WARNINGS_SWITCH): Remove, replacing with...
(WARN_CFLAGS, GNULIB_WARN_CFLAGS): New variable.
(PKG_CHECK_MODULES, C_SWITCH_X_SITE): Use -isystem rather than -I,
when including system files with GCC.
* etc/NEWS: Mention --enable-gcc-warnings.
* lib/Makefile.am (AM_CFLAGS): New macro.
* m4/manywarnings.m4, m4/warnings.m4: New files, from gnulib.
* lib-src/Makefile.in (C_WARNINGS_SWITCH): Remove.
(WARN_CFLAGS, WERROR_CFLAGS): New macros.
(BASE_CFLAGS): Use new macros rather than old.
* lwlib/Makefile.in (C_WARNINGS_SWITCH): Remove.
(WARN_CFLAGS, WERROR_CFLAGS): New macros.
(ALL_CFLAGS): Use new macros rather than old.
* oldXMenu/Makefile.in (C_WARNINGS_SWITCH): Remove.
(WARN_CFLAGS, WERROR_CFLAGS): New macros.
(ALL_CFLAGS): Use new macros rather than old.
* src/Makefile.in (C_WARNINGS_SWITCH): Remove.
(WARN_CFLAGS, WERROR_CFLAGS): New macros.
(ALL_CFLAGS): Use new macros rather than old.
* src/process.c: Ignore -Wstrict-overflow to work around GCC bug 52904.
* src/regex.c: Ignore -Wstrict-overflow.  If !emacs, also ignore
-Wunused-but-set-variable, -Wunused-function, -Wunused-macros,
-Wunused-result, -Wunused-variable.  This should go away once
the Emacs and Gnulib regex code is merged.
(xmalloc, xrealloc): Now static.

1 files changed, 17 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 2fe50a6d83b..8f7ccc573af 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,20 @@
+2012-04-09  Paul Eggert  <eggert@cs.ucla.edu>
+
+        configure: new option --enable-gcc-warnings
+        I have been using this change for many months in my private copy
+        of Emacs, and have used it to find several bugs.  It's mature
+        enough to publish now.
+        * Makefile.in (GNULIB_MODULES): Add warnings, manywarnings.
+        * configure.in: Support --enable-gcc-warnings, in the style of
+        other GNU packages such as coreutils.
+        (C_WARNINGS_SWITCH): Remove, replacing with...
+        (WARN_CFLAGS, GNULIB_WARN_CFLAGS): New variable.
+        (PKG_CHECK_MODULES, C_SWITCH_X_SITE): Use -isystem rather than -I,
+        when including system files with GCC.
+        * etc/NEWS: Mention --enable-gcc-warnings.
+        * lib/Makefile.am (AM_CFLAGS): New macro.
+        * m4/manywarnings.m4, m4/warnings.m4: New files, from gnulib.
+
 2012-04-09  Glenn Morris  <rgm@gnu.org>
 
         * Makefile.in (leim): Check cd return value.  Pass fewer variables.