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 <s...@weilnetz.de> --- This is a rather old and long tested patch: I use -Wextra in my QEMU builds for more than a year now. At least one bug was found by using this warning level (see commit b22dd1243f38286263d40496ce5298a8a7d96eea). My tests include Linux and Windows hosts (gcc), but not BSD based hosts, so maybe those hosts might need additional code fixes. clang reports lots of -Wunused-value warnings. Regards, Stefan configure | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/configure b/configure index 18fa608..252214b 100755 --- a/configure +++ b/configure @@ -299,7 +299,7 @@ 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 $QEMU_CFLAGS" QEMU_INCLUDES="-I. -I\$(SRC_PATH) -I\$(SRC_PATH)/include" @@ -1199,11 +1199,15 @@ if test -z "$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="-Wendif-labels $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="-fstack-protector-all -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-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