Stage2 clang: llvm-tblgen will not compile

[Derrick]

Under chroot, LLD and clang will not compile because llvm-tblgen fails to compile:

[14/22] Building CXX object utils/TableGen/CMakeFiles/llvm-tblgen.dir/CodeGenHwModes.cpp.o
In file included from /sources/llvm-project-15.0.5.src/llvm/utils/TableGen/DAGISelMatcherOpt.cpp:14:
/sources/llvm-project-15.0.5.src/llvm/utils/TableGen/CodeGenDAGPatterns.h:1046:23: error: expected expression
    return Operands[ON];
                      ^
1 error generated.

[Derrick]

Source for TableGen builds fine if built with the stage0 clang

[Derrick]

Perhaps, stage1 should have been compiled from source that wasn't patched to use the dynamic loader at /llvmtools/lib and the packages built for llvmtools will then need to have the executables patched with the dynamic loader at /llvmtools/lib

[Derrick]

^ Tried it. Same exact errors.

Tried the GCC+libstdc++ built for llvmtools: Same error.

[Derrick]

But yet, stage0 clang can be reconfigured to build stage2 for the final system.

If so, was there a reason for building stage1 clang?

[Derrick]

For now, stage0 will build stage2 clang. This change is introduced with commit 550cf2c

I may end up moving stage0 clang from cgnutools to llvmtools:

1. Build mussel to produce cross-gcc
2. Use cross-gcc to build stage0 clang and install in llvmtools
3. Use stage0 clang to build rest of llvmtools
4. Enter chroot. Build final system clang with stage0 clang

If successful, this would reduce build time as clang [& friends] will be built only twice as stage0 and final system compiler... instead of 3 times.

Interestingly, stage0 clang runs both on the host [glibc] and under chroot [musl]