[Qemu-trivial] [PATCH v2] configure: Enable extra compiler warnings

[Stefan Weil]

Compiler option -Wextra enables an additional set of compiler warnings.

Some of these warnings were already enabled explicitly in QEMU:
-Wold-style-declaration, -Wtype-limits, -Wignored-qualifiers and
-Wempty-body are now redundant and can be removed.

Others don't work with the current code and must be disabled to
avoid warnings: -Wno-missing-field-initializers, -Wno-override-init,
-Wno-sign-compare and -Wno-unused-parameter.

Signed-off-by: Stefan Weil <address@hidden>
---

v2: Removed unintentional change which added -fstack-protector-all
    and rebased for latest QEMU.

 configure |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 2b83936..ff89d60 100755
--- a/configure
+++ b/configure
@@ -310,7 +310,7 @@ sdl_config="${SDL_CONFIG-${cross_prefix}sdl-config}"
 
 # default flags for all hosts
 QEMU_CFLAGS="-fno-strict-aliasing $QEMU_CFLAGS"
-QEMU_CFLAGS="-Wall -Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
+QEMU_CFLAGS="-Wall -Wextra -Wundef -Wwrite-strings -Wmissing-prototypes 
$QEMU_CFLAGS"
 QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
 QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE 
$QEMU_CFLAGS"
 QEMU_INCLUDES="-I. -I\$(SRC_PATH) -I\$(SRC_PATH)/include"
@@ -1236,12 +1236,16 @@ if test -z "$werror" ; then
     fi
 fi
 
-gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
-gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers 
$gcc_flags"
-gcc_flags="-Wmissing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
+gcc_flags="-Wold-style-definition"
+gcc_flags="-Wformat-security -Wformat-y2k -Winit-self $gcc_flags"
+gcc_flags="-Wmissing-include-dirs -Wnested-externs $gcc_flags"
 gcc_flags="-Wendif-labels $gcc_flags"
 gcc_flags="-Wno-initializer-overrides $gcc_flags"
+gcc_flags="-Wno-missing-field-initializers $gcc_flags"
+gcc_flags="-Wno-override-init $gcc_flags"
+gcc_flags="-Wno-sign-compare $gcc_flags"
 gcc_flags="-Wno-string-plus-int $gcc_flags"
+gcc_flags="-Wno-unused-parameter $gcc_flags"
 # Note that we do not add -Werror to gcc_flags here, because that would
 # enable it for all configure tests. If a configure test failed due
 # to -Werror this would just silently disable some features,
-- 
1.7.10.4