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llvm/7/compiler-rt: define CMAKE_*_COMPILER_TARGET unconditionally #56502

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merged 1 commit into from Feb 28, 2019
Merged

llvm/7/compiler-rt: define CMAKE_*_COMPILER_TARGET unconditionally #56502

merged 1 commit into from Feb 28, 2019

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delroth
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@delroth delroth commented Feb 28, 2019

When building with -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON the compiler-rt
CMake configuration attempts to use CMAKE_*_COMPILER_TARGET variables,
which are usually only defined in cross-compilation mode.

Motivation for this change

Fixes regression from #55750.

@matthewbauer

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Assured whether relevant documentation is up to date
  • Fits CONTRIBUTING.md.

@delroth
llvm/7/compiler-rt: define CMAKE_*_COMPILER_TARGET unconditionally
7541e4f 
When building with -DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON the compiler-rt
CMake configuration attempts to use CMAKE_*_COMPILER_TARGET variables,
which are usually only defined in cross-compilation mode.
@delroth delroth mentioned this pull request Feb 28, 2019
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@matthewbauer
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Oh weird! I guess because we switched it from configureFlags -> cmakeFlags, it started actually applying COMPILER_RT_DEFAULT_TARGET_ONLY. Seems ok though...

@matthewbauer matthewbauer merged commit fa5ab50 into NixOS:master Feb 28, 2019
@matthewbauer
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Thanks!

@dtzWill
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dtzWill commented Feb 28, 2019

I'm not sure but should this be stdenv.targetPlatform.config? For non-cross it'll be the same, so getting this right may be important for cross-compilation. It's quite possible this is the correct value, but may be good to check...

@matthewbauer
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Yeah, compiler-rt is a runtime library so it should be hostPlatform. We want it to be taken from targetPackages like the libc is.

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dtzWill commented Feb 28, 2019 via email

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