From: Dan Nicolaescu <dann@ics.uci.edu>
To: bug-gnu-emacs <bug-gnu-emacs@gnu.org>
Subject: bug#4261: make gcc warn about c99 declarations
Date: Tue, 25 Aug 2009 16:16:39 -0700 (PDT) [thread overview]
Message-ID: <200908252316.n7PNGdd6014912@godzilla.ics.uci.edu> (raw)
There were several patch proposals recently that had c99 style
declarations in the middle of a block.
There's a gcc flag that warns about that.
The configure.in patch below enables the flag if gcc supports it,
following the model for -Wno-pointer-sign
Please apply if appropriate.
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 25 Aug 2009 23:11:58 -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
next reply other threads:[~2009-08-25 23:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200911201630.nAKGUpEI024572@godzilla.ics.uci.edu>
2009-08-25 23:16 ` Dan Nicolaescu [this message]
2009-11-20 16:35 ` bug#4261: marked as done (make gcc warn about c99 declarations) Emacs bug Tracking System
2009-09-14 19:16 ` bug#4434: add -Wdeclaration-after-statement to CFLAGS if supported Dan Nicolaescu
2009-11-19 16:55 ` Dan Nicolaescu
2009-11-19 21:09 ` Stefan Monnier
2009-11-20 16:35 ` bug#4434: marked as done (add -Wdeclaration-after-statement to CFLAGS if supported) Emacs bug Tracking System
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