| Message ID | 20220303094555.GA22776@delia.home |
|---|---|
| State | New |
| Headers | show |
| Series | [committed,nvptx] Use --no-verify for sm_30 | expand |
diff --git a/gcc/config/nvptx/nvptx.h b/gcc/config/nvptx/nvptx.h index 4ab412bc7d8..3ca22a595d2 100644 --- a/gcc/config/nvptx/nvptx.h +++ b/gcc/config/nvptx/nvptx.h @@ -32,7 +32,7 @@ /* Default needs to be in sync with default for misa in nvptx.opt. We add a default here to work around a hard-coded sm_30 default in nvptx-as. */ -#define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}" +#define ASM_SPEC "%{misa=*:-m %*; :-m sm_35}%{misa=sm_30:--no-verify}" #define TARGET_CPU_CPP_BUILTINS() nvptx_cpu_cpp_builtins ()
Hi, In PR97348, we ran into the problem that recent CUDA dropped support for sm_30, which inhibited the build when building with CUDA bin in the path, because the nvptx-tools assembler uses CUDA's ptxas to do ptx verification. To fix this, in gcc-11 the default sm_xx was moved from sm_30 to sm_35. This however broke support for sm_30 boards: an executable build for sm_30 might contain sm_35 code from the libraries, which are build with the default sm_xx (PR104758). We want to fix this by going back to having the libraries build with sm_30, as was the case for gcc-5 to gcc-10. That however reintroduces the problem from PR97348. Deal with PR97348 in the simplest way possible: when calling the assembler for sm_30, specify --no-verify. This has the unfortunate effect that after fixing PR104758 by building libraries with sm_30, the libraries are no longer verified. This can be improved upon by: - adding a configure test in gcc that tests if CUDA supports sm_30, and if so disabling this patch - dealing with this in nvptx-tools somehow, either: - detect at ptxas execution time that it doesn't support sm_30, or - detect this at nvptx-tool configure time. Committed to trunk. Thanks, - Tom [nvptx] Use --no-verify for sm_30 gcc/ChangeLog: 2022-03-03 Tom de Vries <tdevries@suse.de> * config/nvptx/nvptx.h (ASM_SPEC): Add %{misa=sm_30:--no-verify}. --- gcc/config/nvptx/nvptx.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)