For compatibility with other SVR4 assemblers, '/' starts a comment on *-elf binutils target and thus division operator is not allowed [1][2]. That breaks cstart64.S build: x86/cstart64.S: Assembler messages: x86/cstart64.S:294: Error: unbalanced parenthesis in operand 1. The option is ignored on the Linux target of GNU binutils. 1. https://sourceware.org/binutils/docs/as/i386_002dChars.html 2. https://sourceware.org/binutils/docs/as/i386_002dOptions.html#index-_002d_002ddivide-option_002c-i386 Cc: Cameron Esfahani <dirty@xxxxxxxxx> Signed-off-by: Roman Bolshakov <r.bolshakov@xxxxxxxxx> --- x86/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/x86/Makefile b/x86/Makefile index 8a007ab..22afbb9 100644 --- a/x86/Makefile +++ b/x86/Makefile @@ -1 +1,3 @@ include $(SRCDIR)/$(TEST_DIR)/Makefile.$(ARCH) + +COMMON_CFLAGS += -Wa,--divide -- 2.26.1
