From 587f17018a2c6c414e41a312b002faaef60cf423 Mon Sep 17 00:00:00 2001 From: Nick Desaulniers Date: Fri, 14 Feb 2020 14:18:11 -0800 Subject: [PATCH] Kconfig: add config option for asm goto w/ outputs This allows C code to make use of compilers with support for output variables along the fallthrough path via preprocessor define: CONFIG_CC_HAS_ASM_GOTO_OUTPUT [ This is not used anywhere yet, and currently released compilers don't support this yet, but it's coming, and I have some local experimental patches to take advantage of it when it does - Linus ] Signed-off-by: Nick Desaulniers Signed-off-by: Linus Torvalds --- init/Kconfig | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/init/Kconfig b/init/Kconfig index 2d12d38cdd88..b5294bcba61d 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -36,6 +36,10 @@ config CC_CAN_LINK config CC_HAS_ASM_GOTO def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC)) +config CC_HAS_ASM_GOTO_OUTPUT + depends on CC_HAS_ASM_GOTO + def_bool $(success,echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | $(CC) -x c - -c -o /dev/null) + config TOOLS_SUPPORT_RELR def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh)