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author | Tom de Vries <tdevries@suse.de> | 2022-03-03 09:21:04 +0100 |
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committer | Tom de Vries <tdevries@suse.de> | 2022-03-03 10:43:34 +0100 |
commit | 12fa7641ceed9c9139e2ea7b62c11f3dc5b6f6f4 (patch) | |
tree | 97b475f6a73b164207be2b3c1f0aa2ad2f6ad8df | |
parent | 5065d69fca535eeb869ba209cdf605f3ecf8b18d (diff) | |
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[nvptx] Use --no-verify for sm_30
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.
gcc/ChangeLog:
2022-03-03 Tom de Vries <tdevries@suse.de>
* config/nvptx/nvptx.h (ASM_SPEC): Add %{misa=sm_30:--no-verify}.
-rw-r--r-- | gcc/config/nvptx/nvptx.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gcc/config/nvptx/nvptx.h b/gcc/config/nvptx/nvptx.h index 4ab412b..3ca22a5 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 () |