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bug#4434: add -Wdeclaration-after-statement to CFLAGS if supported
From: |
Dan Nicolaescu |
Subject: |
bug#4434: add -Wdeclaration-after-statement to CFLAGS if supported |
Date: |
Mon, 14 Sep 2009 12:16:16 -0700 (PDT) |
Recently we've had a few instances of declarations being added in the
middle of a block.
gcc has a flag to warn about this.
Here's a patch to add this flag to CFLAGS (it mirrors what we already do
for -Wno-pointer-sign).
OK to check in?
Index: configure.in
===================================================================
RCS file: /cvsroot/emacs/emacs/configure.in,v
retrieving revision 1.607
diff -u -3 -p -u -p -r1.607 configure.in
--- configure.in 23 Aug 2009 02:15:00 -0000 1.607
+++ configure.in 14 Sep 2009 18:46:36 -0000
@@ -757,6 +757,19 @@ CFLAGS="$SAVE_CFLAGS"
unset has_option
unset SAVE_CFLAGS
+### Use -Wdeclaration-after-statement if the compiler supports it
+AC_MSG_CHECKING([whether gcc understands
-Wdeclaration-after-statement])
+SAVE_CFLAGS="$CFLAGS"
+CFLAGS="$CFLAGS -Wdeclaration-after-statement"
+AC_TRY_COMPILE([], [], has_option=yes, has_option=no,)
+if test $has_option = yes; then
+ C_WARNINGS_SWITCH="-Wdeclaration-after-statement $C_WARNINGS_SWITCH"
+fi
+AC_MSG_RESULT($has_option)
+CFLAGS="$SAVE_CFLAGS"
+unset has_option
+unset SAVE_CFLAGS
+
#### Some other nice autoconf tests.
dnl checks for programs
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