Output from Rust profiler build hides concurrent C++ build output

[manopapad]

During our Legion build we also do the build of the legion profiler (which goes through Corrosion), and that happens in a recursive invocation of cmake:

    [0/227] cd /home/mpapadakis/condagcc/legion/tools/legion_prof_rs && /home/mpapadakis/condagcc/env/bin/cmake -E env ...

At that point the sub-cmake seems to take over the output, and prints out successive lines of which package it’s compiling, e.g.

       Compiling libc v0.2.147
       Compiling memchr v2.5.0
       ...

In the meantime, other targets from the parent cmake invocation continue to be built, but their output is lost.

See no-corrosion.txt and with-corrosion.txt for a comparison.

I tried disabling cargo's progress bar CARGO_TERM_PROGRESS_WHEN=never, but that didn't help.

I'm reporting this here because I was not able to reproduce using a pure Legion build, so it possibly has something to do with the recursive build of Legion that we do during legate.core build, or possibly our use of ninja, or who knows what.

On a pure Legion build:

~/temp> git clone --depth 1 git@gitlab.com:StanfordLegion/legion.git
~/temp> cd legion
~/temp/legion> mkdir build/
~/temp/legion> cd build/
~/temp/legion/build> cmake -DLegion_BUILD_RUST_PROFILER=ON ..
~/temp/legion/build> cmake --build . -j 2

I see the lines from corrosion/cargo mixed together with the C++ compilation lines, but at least no lines get lost.

[manopapad]

I tried passing --quiet to conda-build:

@@ -964,6 +964,7 @@ if(Legion_BUILD_ALL OR Legion_BUILD_RUST_PROFILER)
     MANIFEST_PATH tools/legion_prof_rs/Cargo.toml
     ALL_FEATURES
     PROFILE release
+    FLAGS --quiet
   )

   install(

This kills all the output from the legion_prof step, but still the concurrent output is hidden:

    -- Build files have been written to: /home/mpapadakis/condagcc/legate.core/_skbuild/linux-x86_64-3.10/cmake-build
    [0/227] cd /home/mpapadakis/condagcc/legion/tools/legion_prof_rs && /home/mpapadakis/condagcc/env/bin/cmake -E env CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=/home/mpapadakis/condagcc/env/bin/x86_64-conda-linux-gnu-cc CC_x86_64-unknown-linux-gnu=/home/mpapadakis/condagcc/env/bin/x86_64-conda-linux-gnu-cc CXX_x86_64-unknown-linux-gnu=/home/mpapadakis/condagcc/env/bin/x86_64-conda-linux-gnu-c++ CORROSION_BUILD_DIR=/home/mpapadakis/condagcc/legate.core/_skbuild/linux-x86_64-3.10/cmake-build/_deps/legion-build CARGO_BUILD_RUSTC=/home/mpapadakis/condagcc/env/bin/rustc /home/mpapadakis/condagcc/env/bin/cargo rustc --bin=legion_prof --target=x86_64-unknown-linux-gnu --all-features --package legion_prof --manifest-path /home/mpapadakis/condagcc/legion/tools/legion_prof_rs/Cargo.toml --target-dir /home/mpapadakis/condagcc/legate.core/_skbuild/linux-x86_64-3.10/cmake-build/./cargo/build --profile=release --quiet -- -Cdefault-linker-libraries=yes
    [207/227] /home/mpapadakis/condagcc/env/bin/x86_64-conda-linux-gnu-c++ -DLegionRuntime_EXPORTS -DUSE_CUDA -I/home/mpapadakis/condagcc/legion/runtime -I/home/mpapadakis/condagcc/legate.core/_skbuild/linux-x86_64-3.10/cmake-build/_deps/legion-build/runtime -fvisibility-inlines-hidden -fmessage-length=0 -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O2 -ffunction-sections -pipe -isystem /home/mpapadakis/condagcc/env/include  -I/home/mpapadakis/condagcc/env/targets/x86_64-linux/include  -L/home/mpapadakis/condagcc/env/targets/x86_64-linux/lib -L/home/mpapadakis/condagcc/env/targets/x86_64-linux/lib/stubs -march=haswell -O0 -g -std=gnu++17 -fPIC -MD -MT _deps/legion-build/runtime/CMakeFiles/LegionRuntime.dir/legion/legion_analysis.cc.o -MF _deps/legion-build/runtime/CMakeFiles/LegionRuntime.dir/legion/legion_analysis.cc.o.d -o _deps/legion-build/runtime/CMakeFiles/LegionRuntime.dir/legion/legion_analysis.cc.o -c /home/mpapadakis/condagcc/legion/runtime/legion/legion_analysis.cc