[PATCH] powerpc: Fix fatal warnings flag for LLVM's integrated assembler

[Nathan Chancellor]

When building with LLVM_IAS=1, there is an error because
'-fatal-warnings' is not recognized as a valid flag:

  clang: error: unsupported argument '-fatal-warnings' to option '-Wa,'

Use the double hyphen version of the flag, '--fatal-warnings', which
works with both the GNU assembler and LLVM's integrated assembler.

Fixes: 608d4a5ca563 ("powerpc: Error on assembly warnings")
Signed-off-by: Nathan Chancellor <nathan at kernel.org>
---
 arch/powerpc/Kbuild | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/Kbuild b/arch/powerpc/Kbuild
index da862e9558bc..571f260b0842 100644
--- a/arch/powerpc/Kbuild
+++ b/arch/powerpc/Kbuild
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
-subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror -Wa,-fatal-warnings
-subdir-asflags-$(CONFIG_PPC_WERROR) := -Wa,-fatal-warnings
+subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror -Wa,--fatal-warnings
+subdir-asflags-$(CONFIG_PPC_WERROR) := -Wa,--fatal-warnings
 
 obj-y += kernel/
 obj-y += mm/

---
base-commit: bfe51886ca544956eb4ff924d1937ac01d0ca9c8
change-id: 20240405-ppc-fix-wa-fatal-warnings-clang-603f0ebb0133

Best regards,
-- 
Nathan Chancellor <nathan at kernel.org>