[empathy] copy error flags from Gabble

[Guillaume Desmottes <gdesmott src gnome org>]

commit c5abfdfed55676136808fea854d9ad3ed7bd458e
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Mon May 25 12:14:59 2009 +0100

    copy error flags from Gabble

 configure.ac |   41 ++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 40 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 17f58ae..e578e57 100644
--- a/configure.ac
+++ b/configure.ac
@@ -84,6 +84,45 @@ AM_PATH_PYTHON([2.3])
 
 EMPATHY_ARG_VALGRIND
 
+
+# -----------------------------------------------------------
+# Error flags
+# -----------------------------------------------------------
+AS_COMPILER_FLAG(-Wall, ERROR_CFLAGS="-Wall", ERROR_CFLAGS="")
+AS_COMPILER_FLAG(-Werror, werror=yes, werror=no)
+
+AC_ARG_ENABLE(Werror,
+  AC_HELP_STRING([--disable-Werror],[compile without -Werror (normally enabled in development builds)]),
+    werror=$enableval, :)
+
+AS_COMPILER_FLAG(-Wextra, wextra=yes, wextra=no)
+AS_COMPILER_FLAG(-Wno-missing-field-initializers,
+        wno_missing_field_initializers=yes,
+        wno_missing_field_initializers=no)
+AS_COMPILER_FLAG(-Wno-unused-parameter,
+        wno_unused_parameter=yes,
+        wno_unused_parameter=no)
+
+ifelse(empathy_nano_version, 0, [],
+    [
+        if test x$werror = xyes; then
+            ERROR_CFLAGS="$ERROR_CFLAGS -Werror"
+        fi
+        if test x$wextra = xyes -a \
+            x$wno_missing_field_initializers = xyes -a \
+            x$wno_unused_parameter = xyes; then
+            ERROR_CFLAGS="$ERROR_CFLAGS -Wextra -Wno-missing-field-initializers -Wno-unused-parameter"
+        fi
+    ])
+
+AS_COMPILER_FLAG(-Wdeclaration-after-statement, ERROR_CFLAGS="$ERROR_CFLAGS -Wdeclaration-after-statement")
+AS_COMPILER_FLAG(-Wshadow, ERROR_CFLAGS="$ERROR_CFLAGS -Wshadow")
+AS_COMPILER_FLAG(-Wstrict-prototypes, ERROR_CFLAGS="$ERROR_CFLAGS -Wstrict-prototypes")
+AS_COMPILER_FLAG(-Wmissing-prototypes, ERROR_CFLAGS="$ERROR_CFLAGS -Wmissing-prototypes")
+AS_COMPILER_FLAG(-Wmissing-declarations, ERROR_CFLAGS="$ERROR_CFLAGS -Wmissing-declarations")
+
+AC_SUBST(ERROR_CFLAGS)
+
 # -----------------------------------------------------------
 # Pkg-Config dependency checks
 # -----------------------------------------------------------
@@ -437,7 +476,7 @@ echo "
 Configure summary:
 
 	Compiler....................:  ${CC}
-	Compiler Flags..............:  ${CFLAGS}
+	Compiler Flags..............:  ${CFLAGS} ${ERROR_CFLAGS}
 	Prefix......................:  ${prefix}
 	Shaved build................:  ${enable_shave}
 	Tests.......................:  ${have_check}