configure.ac: check and use -Wdeclaration-after-statement GCC option

The accidental use of declaration after statement breaks compilation
with C89 compilers such as MSVC. Assuming that MSVC is one of the
supported compilers, it makes sense to ask GCC to at least report
warnings for such problematic code.

diff --git a/configure.ac b/configure.ac
index 59e31c4a1cef355b4a7206f858051e5f5497759b..8a3b622680e2fe7b577a9503d9d9da0da9f3c5fe 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -183,6 +183,7 @@ AC_SUBST(LT_VERSION_INFO)
 # Check for dependencies
 
 PIXMAN_CHECK_CFLAG([-Wall])
+PIXMAN_CHECK_CFLAG([-Wdeclaration-after-statement])
 PIXMAN_CHECK_CFLAG([-fno-strict-aliasing])
 
 dnl =========================================================================