[dovecot-cvs] dovecot configure.in,1.312,1.313

[tss at dovecot.org]

Update of /var/lib/cvs/dovecot
In directory talvi:/tmp/cvs-serv26196

Modified Files:
	configure.in 
Log Message:
Enable -Wstrict-aliasing=2 with gcc 4.



Index: configure.in
===================================================================
RCS file: /var/lib/cvs/dovecot/configure.in,v
retrieving revision 1.312
retrieving revision 1.313
diff -u -d -r1.312 -r1.313
--- configure.in	16 Nov 2006 00:16:31 -0000	1.312
+++ configure.in	18 Nov 2006 14:12:34 -0000	1.313
@@ -352,12 +352,20 @@
 
 dnl * gcc specific options
 if test "x$ac_cv_c_compiler_gnu" = "xyes"; then
-	# -Wcast-qual -Wcast-align -Wconversion # too many warnings
+	# -Wcast-qual -Wcast-align -Wconversion -Wunreachable-code # too many warnings
 	# -Wstrict-prototypes -Wredundant-decls # may give warnings in some systems
 	# -Wmissing-format-attribute -Wmissing-noreturn -Wwrite-strings # a couple of warnings
-	# -Wstrict-aliasing=2 # requires new gcc
 	CFLAGS="$CFLAGS -Wall -W -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2 -Wbad-function-cast"
 
+	AC_TRY_COMPILE([
+	#if __GNUC__ < 4
+	#  error old gcc
+	#endif
+	],,[
+	  # gcc4
+	  CFLAGS="$CFLAGS -Wstrict-aliasing=2"
+	])
+
 	# Use std=gnu99 if we have new enough gcc
 	old_cflags=$CFLAGS
 	CFLAGS="-std=gnu99"