Public bug reported:
This bug is related to the LLVM 20 transition.
The runtime component of .NET currently fails to build on ppc64el and
LLVM 20 with the error
```
[ 75%] Building ASM object
pal/src/CMakeFiles/coreclrpal.dir/arch/ppc64le/debugbreak.S.o
cd
/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/artifacts/obj/coreclr/linux.ppc64le.Release/pal/src
&& /usr/bin/clang -DCOMPILER_SUPPORTS_W_RESERVED_IDENTIFIER -DCORECLR
-DDISABLE_CONTRACTS -DHOST_64BIT -DHOST_POWERPC64 -DHOST_UNIX -DLP64COMPATIBLE
-DNDEBUG -DPIC -DTARGET_64BIT -DTARGET_LINUX -DTARGET_POWERPC64 -DTARGET_UNIX
-DURTBLDENV_FRIENDLY=Retail -DUSE_STL -D_FILE_OFFSET_BITS=64
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/artifacts/obj/coreclr/linux.ppc64le.Release/pal/src
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/src
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/native
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/native/inc
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/inc
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/../inc
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/native/external/libunwind/include
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/native/external/libunwind/include/tdep
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/artifacts/obj/external/libunwind/include
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/artifacts/obj/external/libunwind/include/tdep
-I/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/src/include
-isystem /usr/local/include -O3 -DNDEBUG -fPIC -O3 -g -Wall
-Wno-null-conversion -Wa,--noexecstack -fno-omit-frame-pointer -fms-extensions
-fwrapv -fstack-protector-strong -Wno-unused-variable -Wno-unused-value
-Wno-unused-function -Wno-tautological-compare -Wno-unknown-pragmas
-Wimplicit-fallthrough -Wno-unused-but-set-variable -ffp-contract=off
-Wno-unknown-warning-option -ferror-limit=4096 -Wno-unused-private-field
-Wno-constant-logical-operand -Wno-pragma-pack -Wno-incompatible-ms-struct
-Wno-reserved-identifier -Wno-unsafe-buffer-usage
-Wno-single-bit-bitfield-constant-conversion -Wno-cast-function-type-strict
-Wno-switch-default -fsigned-char -fvisibility=hidden -ffunction-sections
-fexceptions -o CMakeFiles/coreclrpal.dir/arch/ppc64le/debugbreak.S.o -c
/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/src/arch/ppc64le/debugbreak.S
/<<PKGBUILDDIR>>/src/runtime/artifacts/source-build/self/src/src/coreclr/pal/src/arch/ppc64le/context2.S:140:15:
error: invalid register name
ld %r0, 0 +8(%R3)
^
make[5]: *** [pal/src/CMakeFiles/coreclrpal.dir/build.make:1240:
pal/src/CMakeFiles/coreclrpal.dir/arch/ppc64le/context2.S.o] Error 1
```
Build examples:
- .NET 8
[https://launchpadlibrarian.net/778048663/buildlog_ubuntu-plucky-ppc64el.dotnet8_8.0.113-8.0.13-0ubuntu1_BUILDING.txt.gz]
- .NET 9
[https://launchpadlibrarian.net/778050470/buildlog_ubuntu-plucky-ppc64el.dotnet9_9.0.103-9.0.2-0ubuntu1_BUILDING.txt.gz]
** Affects: dotnet8 (Ubuntu)
Importance: Undecided
Assignee: Mateus Rodrigues de Morais (mateus-morais)
Status: In Progress
** Affects: dotnet9 (Ubuntu)
Importance: Undecided
Assignee: Mateus Rodrigues de Morais (mateus-morais)
Status: In Progress
** Affects: dotnet8 (Ubuntu Plucky)
Importance: Undecided
Assignee: Mateus Rodrigues de Morais (mateus-morais)
Status: In Progress
** Affects: dotnet9 (Ubuntu Plucky)
Importance: Undecided
Assignee: Mateus Rodrigues de Morais (mateus-morais)
Status: In Progress
** Also affects: dotnet9 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: dotnet8 (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: dotnet9 (Ubuntu Plucky)
Importance: Undecided
Status: New
** Changed in: dotnet8 (Ubuntu Plucky)
Assignee: (unassigned) => Mateus Rodrigues de Morais (mateus-morais)
** Changed in: dotnet9 (Ubuntu Plucky)
Assignee: (unassigned) => Mateus Rodrigues de Morais (mateus-morais)
** Changed in: dotnet8 (Ubuntu Plucky)
Status: New => In Progress
** Changed in: dotnet9 (Ubuntu Plucky)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2099720
Title:
[LLVM 20] Runtime fails to build on ppc64el with invalid register name
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