From 22a2a43021e8e82226d4b33189e77673b7326c95 Mon Sep 17 00:00:00 2001
From: Jim Meyering <meyering@redhat.com>
Date: Wed, 12 Nov 2008 11:11:54 +0100
Subject: build: add configure-time --enable-gcc-warnings option; avoid
 warnings

* bootstrap.conf (gnulib_modules): Add "warnings" module.
* configure.ac: Add --enable-gcc-warnings, derived from code in bison.
* src/Makefile.am (AM_CFLAGS): Set to $(WARN_CFLAGS) # $(WERROR_CFLAGS)
* lib/Makefile.am (AM_CFLAGS): Change spelling to $(WARN_CFLAGS)
Don't use $(WERROR_CFLAGS), yet.
* src/system.h (usage): Declare.
* src/base64.c (usage): Declare to be global, for consistency.
* src/timeout.c (usage): Likewise.
* src/truncate.c (usage): Likewise.
* src/getlimits.c (usage): Likewise.
* src/pinky.c (ttyname): Declare with prototype, rather than an
empty argument list.
* src/who.c (ttyname): Likewise.
* src/su.c (crypt, getusershell, setusershell, endusershell): Likewise.
---
 configure.ac | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 549c7ee2c..f165893a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -44,6 +44,39 @@ gl_EARLY
 gl_INIT
 coreutils_MACROS
 
+AC_ARG_ENABLE([gcc-warnings],
+  [AS_HELP_STRING([--enable-gcc-warnings],
+		  [turn on lots of GCC warnings (not recommended)])],
+  [case $enableval in
+     yes|no) ;;
+     *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
+   esac
+   gl_gcc_warnings=$enableval],
+  [gl_gcc_warnings=no]
+)
+
+if test "$gl_gcc_warnings" = yes; then
+  gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
+  AC_SUBST([WERROR_CFLAGS])
+  gl_WARN_ADD([-Wall])
+  gl_WARN_ADD([-Wextra])
+  gl_WARN_ADD([-Wshadow])
+  gl_WARN_ADD([-Wno-sign-compare])
+  gl_WARN_ADD([-Wformat])
+  gl_WARN_ADD([-Wformat-security])
+  gl_WARN_ADD([-Wcast-align])
+  gl_WARN_ADD([-Wpointer-arith])
+  gl_WARN_ADD([-Wwrite-strings])
+  gl_WARN_ADD([-Wbad-function-cast])
+  gl_WARN_ADD([-Wmissing-declarations])
+  gl_WARN_ADD([-Wmissing-prototypes])
+  gl_WARN_ADD([-Wstrict-prototypes])
+  AC_SUBST([WARN_CFLAGS])
+  AC_DEFINE([lint], 1, [Define to 1 if the compiler is checking for lint.])
+  AC_DEFINE([_FORTIFY_SOURCE], 2,
+    [enable compile-time and run-time bounds-checking, and some warnings])
+fi
+
 AC_FUNC_FORK
 
 optional_bin_progs=
-- 
cgit v1.2.3-54-g00ecf