Dear all,
normally, the target triplet does not play much of a role as
it is not really exposed to the user. However, for offloading,
it appears often:
* In distribution use, offloading support is compiled in, but
not enabled by default; one needs to use -foffload=… explicitly.
* Even with the default build (all offload targets are enabled by
default), one still might need to specify the host triplet – if,
e.g., NVidia and GCN are both supported — as AMDGCN needs a
-march=, i.e. -foffload=<triplet>=-march=...
Coming to offloading:
* for Nvidia, everyone uses "nvptx-none"
* for AMDGCN is was initially "amdgcn-unknown-amdhsa"
However, when Matthias build it for Debian, he shortened it to
"amdgcn-amdhsa" – as did Richard for SUSE. Cf
https://salsa.debian.org/toolchain-team/gcc/-/blob/master/debian/rules2
andhttps://build.opensuse.org/package/view_file/devel:gcc/gcc10/gcc.spec.in?expand=1
This shortening makes it user friendlier and I like it, but
it now causes that the offloading target is not recognized by
the testsuite – and I think one also should update the documentation.
OK – or do you have better/additional suggestions?
Cheers,
Tobias
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Walter
AMDGCN offloading – use amdgcn-amdhsa
gcc/
* doc/install.texi (amdgcn-*-amdhsa): Renamed
from amdgcn-unknown-amdhsa; change
amdgcn-unknown-amdhsa to amdgcn-amdhsa.
gcc/testsuite/
* lib/target-supports.exp (check_effective_target_offload_gcn):
Check for -foffload=amdgcn-amdhsa not ...=amdgcn-unknown-amdhsa.
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
index 92961833ef6..559610802be 100644
--- a/gcc/doc/install.texi
+++ b/gcc/doc/install.texi
@@ -3572,22 +3572,22 @@ This is a synonym for @samp{x86_64-*-solaris2*}.
@html
<hr />
@end html
-@anchor{amdgcn-unknown-amdhsa}
-@heading amdgcn-unknown-amdhsa
+@anchor{amdgcn-x-amdhsa}
+@heading amdgcn-*-amdhsa
AMD GCN GPU target.
Instead of GNU Binutils, you will need to install LLVM 6, or later, and copy
-@file{bin/llvm-mc} to @file{amdgcn-unknown-amdhsa/bin/as},
-@file{bin/lld} to @file{amdgcn-unknown-amdhsa/bin/ld},
-@file{bin/llvm-nm} to @file{amdgcn-unknown-amdhsa/bin/nm}, and
-@file{bin/llvm-ar} to both @file{bin/amdgcn-unknown-amdhsa-ar} and
-@file{bin/amdgcn-unknown-amdhsa-ranlib}.
+@file{bin/llvm-mc} to @file{amdgcn-amdhsa/bin/as},
+@file{bin/lld} to @file{amdgcn-amdhsa/bin/ld},
+@file{bin/llvm-nm} to @file{amdgcn-amdhsa/bin/nm}, and
+@file{bin/llvm-ar} to both @file{bin/amdgcn-amdhsa-ar} and
+@file{bin/amdgcn-amdhsa-ranlib}.
Use Newlib (2019-01-16, or newer).
To run the binaries, install the HSA Runtime from the
@uref{https://rocm.github.io,,ROCm Platform}, and use
-@file{libexec/gcc/amdhsa-unknown-amdhsa/@var{version}/gcn-run} to launch them
+@file{libexec/gcc/amdhsa-amdhsa/@var{version}/gcn-run} to launch them
on the GPU.
@html
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 4413c26fbc9..58919a31a00 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -9562,7 +9562,7 @@ proc check_effective_target_offload_hsa { } {
proc check_effective_target_offload_gcn { } {
return [check_no_compiler_messages offload_gcn assembly {
int main () {return 0;}
- } "-foffload=amdgcn-unknown-amdhsa" ]
+ } "-foffload=amdgcn-amdhsa" ]
}
# Return 1 if the target support -fprofile-update=atomic
