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, 13 insertions, 0 deletions

diff --git a/src/ChangeLog b/src/ChangeLog
index dbff8e35492..df3336b52e1 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,5 +1,18 @@
 2012-04-09  Paul Eggert  <eggert@cs.ucla.edu>
 
+        configure: new option --enable-gcc-warnings
+        * Makefile.in (C_WARNINGS_SWITCH): Remove.
+        (WARN_CFLAGS, WERROR_CFLAGS): New macros.
+        (ALL_CFLAGS): Use new macros rather than old.
+        * process.c: Ignore -Wstrict-overflow to work around GCC bug 52904.
+        * 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.
+
+2012-04-09  Paul Eggert  <eggert@cs.ucla.edu>
+
         composite.c: use 'double' consistently
         * composite.c (get_composition_id): Use 'double' consistently
         instead of converting 'float' to 'double' and vice versa; this is