From mboxrd@z Thu Jan 1 00:00:00 1970 From: stefan@agner.ch (Stefan Agner) Date: Sat, 11 Aug 2018 11:52:35 +0200 Subject: [PATCH] ARM: require GCC for FRAME_POINTER Message-ID: <20180811095235.1938-1-stefan@agner.ch> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org To produce a meaningful backtrace with FRAME_POINTER enabled the kernel needs a specific function prologue: mov ip, sp stmfd sp!, {fp, ip, lr, pc} sub fp, ip, #4 To get to the required prologue gcc uses apcs and no-sched-prolog. This compiler options are not available on clang, and clang is not able to generate the required prologue. Make the FRAME_POINTER config symbol dependent on GCC. Suggested-by: Arnd Bergmann Signed-off-by: Stefan Agner --- arch/arm/Kconfig.debug | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug index 693f84392f1b..cb65cf67dfa2 100644 --- a/arch/arm/Kconfig.debug +++ b/arch/arm/Kconfig.debug @@ -54,7 +54,7 @@ config DEBUG_WX # n, but then RMK will have to kill you ;). config FRAME_POINTER bool - depends on !THUMB2_KERNEL + depends on !THUMB2_KERNEL && CC_IS_GCC default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER help If you say N here, the resulting kernel will be slightly smaller and -- 2.18.0