objtool: Allow nested externs to enable BUILD_BUG()
Currently BUILD_BUG() macro is expanded to smth like the following: do { extern void __compiletime_assert_0(void) __attribute__((error("BUILD_BUG failed"))); if (!(!(1))) __compiletime_assert_0(); } while (0); If used in a function body this obviously would produce build errors with -Wnested-externs and -Werror. Build objtool with -Wno-nested-externs to enable BUILD_BUG() usage. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
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@ -37,7 +37,7 @@ INCLUDES := -I$(srctree)/tools/include \
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-I$(srctree)/tools/arch/$(HOSTARCH)/include/uapi \
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-I$(srctree)/tools/arch/$(SRCARCH)/include \
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-I$(srctree)/tools/objtool/arch/$(SRCARCH)/include
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WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed
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WARNINGS := $(EXTRA_WARNINGS) -Wno-switch-default -Wno-switch-enum -Wno-packed -Wno-nested-externs
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CFLAGS := -Werror $(WARNINGS) $(KBUILD_HOSTCFLAGS) -g $(INCLUDES) $(LIBELF_FLAGS)
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LDFLAGS += $(LIBELF_LIBS) $(LIBSUBCMD) $(KBUILD_HOSTLDFLAGS)
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