sparcv9 unsupported argument '-Av9b' to option '-Wa,'

[bsdkurt]

oracle$ echo | clang -Wa,-Av9b -x c -
clang: error: unsupported argument '-Av9b' to option '-Wa,'

oracle$ clang -v
OpenBSD clang version 19.1.7
Target: sparc64-unknown-openbsd7.6
Thread model: posix
InstalledDir: /usr/bin

-Wa,-Av9b is supported by gcc on sparc and it would be helpful if clang would support it as well so makefiles don't have to conditionally use -Wa,-mcpu=niagara for clang and -Wa,-Av9b for gcc.

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: Kurt Miller (bsdkurt)

oracle$ echo | clang -Wa,-Av9b -x c - clang: error: unsupported argument '-Av9b' to option '-Wa,'

oracle$ clang -v
OpenBSD clang version 19.1.7
Target: sparc64-unknown-openbsd7.6
Thread model: posix
InstalledDir: /usr/bin

-Wa,-Av9b is supported by gcc on sparc and it would be helpful if clang would support it as well so makefiles don't have to conditionally use -Wa,-mcpu=niagara for clang and -Wa,-Av9b for gcc.

[bsdkurt]

There are some similar issues in the space and I'm unsure if I should open additional bug reports - all sparc related.

1. clang -x assembler-with-cpp does not respect the default CPU that clang without -x assemebler-with-cpp does. clang without -x assembler-with-cpp sets -Av9a as the default CPU for Linux, FreeBSD and OpenBSD:
   https://clang.llvm.org/doxygen/Driver_2ToolChains_2Arch_2Sparc_8cpp_source.html

2. clang -x assembler-with-cpp -Wa,-mcpu=ultrasparc does not change the instruction set to v9a and errors when v9a instructions are used:
   /usr/xenocara/driver/xf86-video-sunffb/src/VISmoveImage.s:2436:2: error: instruction requires a CPU feature not currently enabled
   faligndata %f42, %f44, %f26

The workaround for 2 is to use clang -x assembler-with-cpp -mcpu=ultrasparc

Please let me know if the above should be their own bug reports or can be a part of this bug report.