configure: split c and cxx extra flags
There was no possibility to add specific cxx flags using the configure file. So A new entrance has been created to support it. Duplication of information in configure and rules.mak. Taking QEMU_CFLAGS and add them to QEMU_CXXFLAGS, now the value of QEMU_CXXFLAGS is stored in config-host.mak, so there is no need for it. The makefile for libvixl was adding flags for QEMU_CXXFLAGS in QEMU_CFLAGS because of the addition in rules.mak. That was removed, so adding them where it should be. Signed-off-by: Bruno Dominguez <bru.dominguez@gmail.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1496754467-20893-1-git-send-email-bru.dominguez@gmail.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Bruno Dominguez
Stefan Hajnoczi
parent
528f449f59
commit
11cde1c810
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@ -91,7 +91,8 @@ update_cxxflags() {
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# Set QEMU_CXXFLAGS from QEMU_CFLAGS by filtering out those
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# options which some versions of GCC's C++ compiler complain about
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# because they only make sense for C programs.
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QEMU_CXXFLAGS=
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QEMU_CXXFLAGS="$QEMU_CXXFLAGS -D__STDC_LIMIT_MACROS"
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for arg in $QEMU_CFLAGS; do
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case $arg in
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-Wstrict-prototypes|-Wmissing-prototypes|-Wnested-externs|\
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@ -345,6 +346,9 @@ for opt do
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--extra-cflags=*) QEMU_CFLAGS="$QEMU_CFLAGS $optarg"
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EXTRA_CFLAGS="$optarg"
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;;
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--extra-cxxflags=*) QEMU_CXXFLAGS="$QEMU_CXXFLAGS $optarg"
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EXTRA_CXXFLAGS="$optarg"
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;;
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--extra-ldflags=*) LDFLAGS="$LDFLAGS $optarg"
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EXTRA_LDFLAGS="$optarg"
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;;
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@ -788,6 +792,8 @@ for opt do
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;;
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--extra-cflags=*)
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;;
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--extra-cxxflags=*)
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;;
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--extra-ldflags=*)
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;;
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--enable-debug-info)
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@ -1305,6 +1311,7 @@ Advanced options (experts only):
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--cxx=CXX use C++ compiler CXX [$cxx]
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--objcc=OBJCC use Objective-C compiler OBJCC [$objcc]
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--extra-cflags=CFLAGS append extra C compiler flags QEMU_CFLAGS
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--extra-cxxflags=CXXFLAGS append extra C++ compiler flags QEMU_CXXFLAGS
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--extra-ldflags=LDFLAGS append extra linker flags LDFLAGS
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--make=MAKE use specified make [$make]
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--install=INSTALL use specified install [$install]
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@ -1490,37 +1497,6 @@ if test "$bogus_os" = "yes"; then
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error_exit "Unrecognized host OS $targetos"
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fi
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# Check that the C++ compiler exists and works with the C compiler
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if has $cxx; then
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cat > $TMPC <<EOF
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int c_function(void);
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int main(void) { return c_function(); }
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EOF
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compile_object
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cat > $TMPCXX <<EOF
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extern "C" {
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int c_function(void);
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}
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int c_function(void) { return 42; }
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EOF
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update_cxxflags
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if do_cxx $QEMU_CXXFLAGS -o $TMPE $TMPCXX $TMPO $LDFLAGS; then
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# C++ compiler $cxx works ok with C compiler $cc
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:
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else
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echo "C++ compiler $cxx does not work with C compiler $cc"
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echo "Disabling C++ specific optional code"
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cxx=
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fi
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else
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echo "No C++ compiler available; disabling C++ specific optional code"
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cxx=
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fi
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gcc_flags="-Wold-style-declaration -Wold-style-definition -Wtype-limits"
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gcc_flags="-Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers $gcc_flags"
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gcc_flags="-Wno-missing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
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@ -5064,6 +5040,38 @@ EOF
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fi
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fi
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# Check that the C++ compiler exists and works with the C compiler.
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# All the QEMU_CXXFLAGS are based on QEMU_CFLAGS. Keep this at the end to don't miss any other that could be added.
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if has $cxx; then
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cat > $TMPC <<EOF
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int c_function(void);
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int main(void) { return c_function(); }
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EOF
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compile_object
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cat > $TMPCXX <<EOF
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extern "C" {
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int c_function(void);
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}
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int c_function(void) { return 42; }
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EOF
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update_cxxflags
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if do_cxx $QEMU_CXXFLAGS -o $TMPE $TMPCXX $TMPO $LDFLAGS; then
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# C++ compiler $cxx works ok with C compiler $cc
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:
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else
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echo "C++ compiler $cxx does not work with C compiler $cc"
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echo "Disabling C++ specific optional code"
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cxx=
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fi
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else
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echo "No C++ compiler available; disabling C++ specific optional code"
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cxx=
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fi
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echo_version() {
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if test "$1" = "yes" ; then
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echo "($2)"
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@ -5269,6 +5277,7 @@ if test "$mingw32" = "no" ; then
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fi
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echo "qemu_helperdir=$libexecdir" >> $config_host_mak
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echo "extra_cflags=$EXTRA_CFLAGS" >> $config_host_mak
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echo "extra_cxxflags=$EXTRA_CXXFLAGS" >> $config_host_mak
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echo "extra_ldflags=$EXTRA_LDFLAGS" >> $config_host_mak
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echo "qemu_localedir=$qemu_localedir" >> $config_host_mak
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echo "libs_softmmu=$libs_softmmu" >> $config_host_mak
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@ -5911,6 +5920,7 @@ echo "WINDRES=$windres" >> $config_host_mak
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echo "CFLAGS=$CFLAGS" >> $config_host_mak
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echo "CFLAGS_NOPIE=$CFLAGS_NOPIE" >> $config_host_mak
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echo "QEMU_CFLAGS=$QEMU_CFLAGS" >> $config_host_mak
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echo "QEMU_CXXFLAGS=$QEMU_CXXFLAGS" >> $config_host_mak
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echo "QEMU_INCLUDES=$QEMU_INCLUDES" >> $config_host_mak
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if test "$sparse" = "yes" ; then
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echo "CC := REAL_CC=\"\$(CC)\" cgcc" >> $config_host_mak
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@ -6,9 +6,9 @@ libvixl_OBJS = vixl/utils.o \
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# The -Wno-sign-compare is needed only for gcc 4.6, which complains about
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# some signed-unsigned equality comparisons which later gcc versions do not.
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$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS := -I$(SRC_PATH)/disas/libvixl $(QEMU_CFLAGS) -Wno-sign-compare
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$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CXXFLAGS := -I$(SRC_PATH)/disas/libvixl $(QEMU_CXXFLAGS) -Wno-sign-compare
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# Ensure that C99 macros are defined regardless of the inclusion order of
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# headers in vixl. This is required at least on NetBSD.
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$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CFLAGS += -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS -D__STDC_FORMAT_MACROS
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$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CXXFLAGS += -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
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common-obj-$(CONFIG_ARM_A64_DIS) += $(libvixl_OBJS)
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@ -20,9 +20,6 @@ MAKEFLAGS += -rR
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%.mak:
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clean-target:
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# Flags for C++ compilation
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QEMU_CXXFLAGS = -D__STDC_LIMIT_MACROS $(filter-out -Wstrict-prototypes -Wmissing-prototypes -Wnested-externs -Wold-style-declaration -Wold-style-definition -Wredundant-decls, $(QEMU_CFLAGS))
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# Flags for dependency generation
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QEMU_DGFLAGS += -MMD -MP -MT $@ -MF $(@D)/$(*F).d
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