Messages in this thread | | | Subject | Re: [RFC PATCH v2] MIPS: Kconfig: Select ARCH_WANT_FRAME_POINTERS | From | Tiezhu Yang <> | Date | Tue, 17 Nov 2020 10:17:39 +0800 |
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On 11/16/2020 11:14 PM, Thomas Bogendoerfer wrote: > On Mon, Nov 16, 2020 at 05:55:06PM +0800, Tiezhu Yang wrote: >> Select ARCH_WANT_FRAME_POINTERS to fix the following build error under >> CONFIG_DEBUG_ATOMIC_SLEEP: >> >> CC arch/mips/kernel/signal.o >> {standard input}: Assembler messages: >> {standard input}:1775: Error: Unable to parse register name $fp >> scripts/Makefile.build:283: recipe for target 'arch/mips/kernel/signal.o' failed >> make[2]: *** [arch/mips/kernel/signal.o] Error 1 >> scripts/Makefile.build:500: recipe for target 'arch/mips/kernel' failed >> make[1]: *** [arch/mips/kernel] Error 2 >> Makefile:1799: recipe for target 'arch/mips' failed >> make: *** [arch/mips] Error 2 > I don't see this error and to me it looks strange to fix that with > enablding frame pointers... What gcc is this ?
I found this build error used with gcc 4.9.4. I try it used with gcc 7.3.1 and it has no problem. We can use new gcc version to avoid this build error.
Additionally, I want to know whether ARCH_WANT_FRAME_POINTERS is necessary for MIPS to get more debugging info, with this config we can enable the config FRAME_POINTER by default and disable it manually.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Makefile#n790 ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
Thanks, Tiezhu
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