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Makefile: Fix unrecognized cross-compiler command line options
On architectures that setup CROSS_COMPILE in their arch/*/Makefile (arc, blackfin, m68k, mips, parisc, score, sh, tile, unicore32, xtensa), cc-option and cc-disable-warning may check against the wrong compiler, causing errors like cc1: error: unrecognized command line option "-Wno-maybe-uninitialized" if the host gcc supports a compiler option, while the cross compiler doesn't support that option. Move all logic using cc-option or cc-disable-warning below the inclusion of the arch's Makefile to fix this. Introduced by - commite74fc973b6
("Turn off -Wmaybe-uninitialized when building with -Os"), - commit61163efae0
("kbuild: LLVMLinux: Add Kbuild support for building kernel with Clang"). As -Wno-maybe-uninitialized requires a quite recent gcc (gcc 4.6.3 on Ubuntu 12.04 LTS doesn't support it), this only showed up recently (gcc 4.8.2 on Ubuntu 14.04 LTS does support it). Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Michal Marek <mmarek@suse.cz>
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10
Makefile
10
Makefile
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@ -400,8 +400,8 @@ KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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-fno-strict-aliasing -fno-common \
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-Werror-implicit-function-declaration \
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-Wno-format-security \
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$(call cc-option,-fno-delete-null-pointer-checks,)
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-Wno-format-security
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KBUILD_AFLAGS_KERNEL :=
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KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS := -D__ASSEMBLY__
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@ -607,14 +607,16 @@ endif # $(dot-config)
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# Defaults to vmlinux, but the arch makefile usually adds further targets
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all: vmlinux
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include $(srctree)/arch/$(SRCARCH)/Makefile
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KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
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KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
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else
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KBUILD_CFLAGS += -O2
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endif
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include $(srctree)/arch/$(SRCARCH)/Makefile
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ifdef CONFIG_READABLE_ASM
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# Disable optimizations that make assembler listings hard to read.
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# reorder blocks reorders the control in the function
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