[PATCH v4 3/4] ARM: only use -mtp=cp15 for the compiler

Nick Desaulniers
2022-10-14T20:15:36Z

Avoids an error from the assembler for CONFIG_THUMB2 kernels:

clang-15: error: hardware TLS register is not supported for the thumbv4t
sub-architecture

This flag only makes sense to pass to the compiler, not the assembler.

Perhaps CFLAGS_ABI can be renamed to CPPFLAGS_ABI to reflect that they
will be passed to both the compiler and assembler for sources that
require pre-processing.

Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
---
arch/arm/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 8dd943b50b7d..ee888070b2ff 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -111,7 +111,7 @@ CFLAGS_ABI += -meabi gnu
endif

ifeq ($(CONFIG_CURRENT_POINTER_IN_TPIDRURO),y)
-CFLAGS_ABI += -mtp=cp15
+KBUILD_CFLAGS += -mtp=cp15
endif

# Accept old syntax despite ".syntax unified"
--
2.38.0.413.g74048e4d9e-goog