Report gcc/clang pedantic warnings (configure)

* configure.ac [GCC] (WPEDANTIC): New variable (set to
"-Wpedantic -Wno-long-long" if supported by the compiler).
* configure.ac [GCC] (CFLAGS): Add $WPEDANTIC.

diff --git a/configure.ac b/configure.ac
index 73da0c98996850653a263e1a94b913e3f442f8bb..1c4e2a4aa92753c3f1498c087eab5a7eae537e58 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -407,7 +407,17 @@ if test "$GCC" = yes; then
   CFLAGS="$old_CFLAGS"
   AC_MSG_RESULT($ac_cv_cc_wextra)
   AS_IF([test "$ac_cv_cc_wextra" = yes], [WEXTRA="-Wextra"], [WEXTRA="-W"])
-  CFLAGS="-Wall $WEXTRA $CFLAGS"
+  AC_MSG_CHECKING(for gcc -Wpedantic)
+  CFLAGS="-Wpedantic -Wno-long-long $CFLAGS"
+  AC_TRY_COMPILE([],[
+    extern int quiet;
+  ], [ac_cv_cc_pedantic=yes], [ac_cv_cc_pedantic=no])
+  CFLAGS="$old_CFLAGS"
+  AC_MSG_RESULT($ac_cv_cc_pedantic)
+  WPEDANTIC=
+  AS_IF([test "$ac_cv_cc_pedantic" = yes],
+        [WPEDANTIC="-Wpedantic -Wno-long-long"])
+  CFLAGS="-Wall $WEXTRA $WPEDANTIC $CFLAGS"
 fi
 
 AC_MSG_CHECKING(for xlc)