libvixl: remove per-target compiler flags

We are already including -D__STDC_LIMIT_MACROS in the global CXXFLAGS,
so it makes sense to do the same for -D__STDC_CONSTANT_MACROS and
-D__STDC_FORMAT_MACROS instead of limiting that to libvixl.

The -Wno-sign-compare option can also be removed since GCC 4.6 is not
supported anymore.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -101,7 +101,7 @@ update_cxxflags() {
     # Set QEMU_CXXFLAGS from QEMU_CFLAGS by filtering out those
     # options which some versions of GCC's C++ compiler complain about
     # because they only make sense for C programs.
-    QEMU_CXXFLAGS="$QEMU_CXXFLAGS -D__STDC_LIMIT_MACROS"
+    QEMU_CXXFLAGS="$QEMU_CXXFLAGS -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS"
 
     for arg in $QEMU_CFLAGS; do
         case $arg in
@@ -595,6 +595,7 @@ QEMU_CFLAGS="-Wall -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 $QEMU_CFLAGS"
 QEMU_INCLUDES="-iquote . -iquote \$(SRC_PATH) -iquote \$(SRC_PATH)/accel/tcg -iquote \$(SRC_PATH)/include"
+QEMU_INCLUDES="$QEMU_INCLUDES -iquote \$(SRC_PATH)/disas/libvixl"
 if test "$debug_info" = "yes"; then
     CFLAGS="-g $CFLAGS"
     LDFLAGS="-g $LDFLAGS"

disas/libvixl/Makefile.objs

@@ -1,14 +1,5 @@
-libvixl_OBJS = vixl/utils.o \
+common-obj-$(CONFIG_ARM_A64_DIS) = vixl/utils.o \
                vixl/compiler-intrinsics.o \
                vixl/a64/instructions-a64.o \
                vixl/a64/decoder-a64.o \
                vixl/a64/disasm-a64.o
-
-# The -Wno-sign-compare is needed only for gcc 4.6, which complains about
-# some signed-unsigned equality comparisons which later gcc versions do not.
-$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CXXFLAGS := -I$(SRC_PATH)/disas/libvixl $(QEMU_CXXFLAGS) -Wno-sign-compare
-# Ensure that C99 macros are defined regardless of the inclusion order of
-# headers in vixl. This is required at least on NetBSD.
-$(addprefix $(obj)/,$(libvixl_OBJS)): QEMU_CXXFLAGS += -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS
-
-common-obj-$(CONFIG_ARM_A64_DIS) += $(libvixl_OBJS)