Alpha Level LLVM-11 Support

[AmeyaVS]

• Not exhaustively tested
• Some feature might be broken
• Currently only build and tested out-of-tree LLVM build tree.
• Current pytest report:

  ============================================================================================= short test summary info =============================================================================================
  FAILED test/test_cbe.py::test_consistent_return_value_c[test_char_sized_ptr_math_decr--O2] - Exception: Got unexpected output from process
  FAILED test/test_cbe.py::test_consistent_return_value_c[test_char_sized_ptr_math_decr--O3] - Exception: Got unexpected output from process
  ============================================================================== 2 failed, 497 passed, 32 xfailed in 72.76s (0:01:12) ===============================================================================

• 2 failing tests already captured in #89 .

[hikari-no-yume]

Nitpick: shouldn't it be called “LLVM 11 support”? The incompatibilities are about changes in the LLVM infrastructure, rather than Clang specifically, right?

[hikari-no-yume]

This doesn't seem to work for LLVM 10, or at least the system version of it provided by Ubuntu 20.04. Is that intentional? I don't have any particular stance, personally, on whether to support more than one version of LLVM, but it seemed worth testing.

$ make -j16 llvm-cbe 
Scanning dependencies of target LLVMCBackendCodeGen
[ 25%] Built target LLVMCBackendInfo
[ 37%] Building CXX object lib/Target/CBackend/CMakeFiles/LLVMCBackendCodeGen.dir/CBackend.cpp.o
[ 50%] Building CXX object lib/Target/CBackend/CMakeFiles/LLVMCBackendCodeGen.dir/CTargetMachine.cpp.o
[ 62%] Linking CXX static library libLLVMCBackendCodeGen.a
[ 75%] Built target LLVMCBackendCodeGen
Scanning dependencies of target llvm-cbe
[ 87%] Building CXX object tools/llvm-cbe/CMakeFiles/llvm-cbe.dir/llvm-cbe.cpp.o
tools/llvm-cbe/llvm-cbe.cpp:57:8:error: ‘codegen’ does not name a type
   57 | static codegen::RegisterCodeGenFlags CGF;
      |        ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp: In function ‘llvm::ToolOutputFile* GetOutputStream(const char*, llvm::Triple::OSType, const char*)’:
tools/llvm-cbe/llvm-cbe.cpp:118:15: error: ‘codegen’ has not been declared
  118 |       switch (codegen::getFileType()) {
      |               ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:158:11: error: ‘codegen’ has not been declared
  158 |   switch (codegen::getFileType()) {
      |           ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp: In function ‘int compileModule(char**, llvm::LLVMContext&)’:
tools/llvm-cbe/llvm-cbe.cpp:246:17: error: ‘codegen’ has not been declared
  246 |   auto MAttrs = codegen::getMAttrs();
      |                 ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:248:7 error: ‘codegen’ has not been declared
  248 |       codegen::getMCPU() == "help" || (!MAttrs.empty() && MAttrs.front() == "help");
      |       ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:314:29: error: ‘codegen’ has not been declared
  314 |   Options.AllowFPOpFusion = codegen::getFuseFPOps();
      |                             ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:315:26: error: ‘codegen’ has not been declared
  315 |   Options.UnsafeFPMath = codegen::getEnableUnsafeFPMath();
      |                          ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:316:26: error: ‘codegen’ has not been declared
  316 |   Options.NoInfsFPMath = codegen::getEnableNoInfsFPMath();
      |                          ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:317:26: error: ‘codegen’ has not been declared
  317 |   Options.NoNaNsFPMath = codegen::getEnableNoNaNsFPMath();
      |                          ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:319:7 error: ‘codegen’ has not been declared
  319 |       codegen::getEnableHonorSignDependentRoundingFPMath();
      |       ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:320:7 error: ‘codegen’ has not been declared
  320 |   if (codegen::getFloatABIForCalls() != FloatABI::Default)
      |       ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:321:28: error: ‘codegen’ has not been declared
  321 |     Options.FloatABIType = codegen::getFloatABIForCalls();
      |                            ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:322:26: error: ‘codegen’ has not been declared
  322 |   Options.NoZerosInBSS = codegen::getDontPlaceZerosInBSS();
      |                          ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:323:35: error: ‘codegen’ has not been declared
  323 |   Options.GuaranteedTailCallOpt = codegen::getEnableGuaranteedTailCallOpt();
      |                                   ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:324:36: error: ‘codegen’ has not been declared
  324 |   Options.StackAlignmentOverride = codegen::getOverrideStackAlignment();
      |                                    ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:329:30: error: ‘codegen’ has not been declared
  329 |       TheTriple.getTriple(), codegen::getMCPU(), FeaturesStr, Options, llvm::codegen::getRelocModel()));
      |                              ^~~~~~~
tools/llvm-cbe/llvm-cbe.cpp:329:78: error: ‘llvm::codegen’ has not been declared
  329 | getTriple(), codegen::getMCPU(), FeaturesStr, Options, llvm::codegen::getRelocModel()));
      |                                                              ^~~~~~~

tools/llvm-cbe/llvm-cbe.cpp:378:34: error: ‘codegen’ has not been declared
  378 |                                  codegen::getFileType(), NoVerify)) {
      |                                  ^~~~~~~
make[3]: *** [tools/llvm-cbe/CMakeFiles/llvm-cbe.dir/build.make:63: tools/llvm-cbe/CMakeFiles/llvm-cbe.dir/llvm-cbe.cpp.o] Error 1
make[2]: *** [CMakeFiles/Makefile2:406: tools/llvm-cbe/CMakeFiles/llvm-cbe.dir/all] Error 2
make[1]: *** [CMakeFiles/Makefile2:413: tools/llvm-cbe/CMakeFiles/llvm-cbe.dir/rule] Error 2
make: *** [Makefile:255: llvm-cbe] Error 2

[AmeyaVS]

@hikari-no-yume Updated the title my bad for missing the intent.

Nitpick: shouldn't it be called “LLVM 11 support”? The incompatibilities are about changes in the LLVM infrastructure, rather than Clang specifically, right?

I will try and fix these code section to be compatible with LLVM-10.

[hikari-no-yume]

Hi, it builds on my system LLVM 10 now, and running pytest I only get those same two known failures. Thanks!

[hikari-no-yume]

Maybe the README should be updated to say it builds with LLVM 11?