Missing llvm-ar ?

[mattgodbolt]

I just updated to 2200d5315ddd3071985a2e82e574da525617867e and now I get:

src/main/tools/linux-sandbox-pid1.cc:427: "execvp(external/llvm_toolchain/bin/llvm-ar, 0xbf08a0)": No such file or directory

when building. The most recent commit appears to have been something that tried to fix this (making a guess) - any ideas? (LLVM 8.0.0 but 9.0.0 fails too, on Linux 64)

[mattgodbolt]

For what it's worth appears to be packaged:

~/d/core (master|✔) 14.9s $ ls bazel-core/external/llvm_toolchain/bin/
ar@                        clang-change-namespace*  clang-include-fixer*    dsymutil*          llc*              llvm-cfi-verify*  llvm-diff*       llvm-lib@         llvm-nm*          llvm-readelf@  llvm-symbolizer*  sanstats*
bugpoint*                  clang-check*             clang-offload-bundler*  find-all-symbols*  lld*              llvm-config*      llvm-dis*        llvm-link*        llvm-objcopy*     llvm-readobj*  llvm-tblgen*      scan-build*
cc_wrapper.sh*             clang-cl@                clang-query*            git-clang-format*  lld-link@         llvm-cov*         llvm-dlltool@    llvm-lto*         llvm-objdump*     llvm-rtdyld*   llvm-undname*     scan-view*
c-index-test*              clang-cpp@               clang-refactor*         hmaptool*          lli*              llvm-c-test*      llvm-dwarfdump*  llvm-lto2*        llvm-opt-report*  llvm-size*     llvm-xray*        verify-uselistorder*
clang@                     clangd*                  clang-rename*           ld@                llvm-ar*          llvm-cvtres*      llvm-dwp*        llvm-mc*          llvm-pdbutil*     llvm-split*    modularize*       wasm-ld@
clang++@                   clang-extdef-mapping*    clang-reorder-fields*   ld64.lld@          llvm-as*          llvm-cxxdump*     llvm-elfabi*     llvm-mca*         llvm-profdata*    llvm-stress*   obj2yaml*         yaml2obj*
clang-8*                   clang-format*            clang-tidy*             ld.gold@           llvm-bcanalyzer*  llvm-cxxfilt*     llvm-exegesis*   llvm-modextract*  llvm-ranlib@      llvm-strings*  opt*
clang-apply-replacements*  clang-import-test*       diagtool*               ld.lld@            llvm-cat*         llvm-cxxmap*      llvm-extract*    llvm-mt*          llvm-rc*          llvm-strip@    sancov*

[mattgodbolt]

~/d/core (master|✔) $ bazel-core/external/llvm_toolchain/bin/llvm-ar --version
LLVM (http://llvm.org/):
  LLVM version 8.0.0
  Optimized build.
  Default target: x86_64-unknown-linux-gnu
  Host CPU: skylake-avx512

[mattgodbolt]

Running with sanbox debugging and then ls-ing the directory that actually gets mounted in the sandbox:

~/d/core (master|✔) $ ls /home/mgodbolt/.cache/bazel/_bazel_mgodbolt/d5bad8eff3da01980a0963475d1edfc1/sandbox/linux-sandbox/2019/execroot/__main__/external/
bazel_tools/  llvm_toolchain/
~/d/core (master|✔) $ ls /home/mgodbolt/.cache/bazel/_bazel_mgodbolt/d5bad8eff3da01980a0963475d1edfc1/sandbox/linux-sandbox/2019/execroot/__main__/external/llvm_toolchain/bin/
clang@  clang++@  clang-cpp@  ld@  ld.gold@  ld.lld@

[mattgodbolt]

I just did a binary search of revisions and found that the revision 2200d53 is the culprit. Everything works if I stick to 8f2721aaf4db902529eb92cdf078d4e68dbd4173

[siddharthab]

I think that commit put a minimum bazel version requirement of 1.0. Does it work for you on that?

[mattgodbolt]

At the moment I'm blocked from using bazel 1.0 by other upstream dependencies failing (mostly grpc-related). I'll try when I can get those updated and working. Thanks!

[siddharthab]

Thank you. I will add the minimum version requirement so the messaging is clear.

The unresolved issues in this project will require bazel 1.0, so there is reason for us to support only versions 1.0 and up.

[mattgodbolt]

Sounds good to me: thank you!

[mattgodbolt]

Confirmed fixed if I upgrade to 1.0: thanks!