Francois Saint-Jacques created ARROW-4407:
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Summary: [CMake] ExternalProject_Add does not capture CC/CXX
correctly
Key: ARROW-4407
URL: https://issues.apache.org/jira/browse/ARROW-4407
Project: Apache Arrow
Issue Type: Bug
Components: C++
Affects Versions: 0.12.0
Reporter: Francois Saint-Jacques
The issue is that CC/CXX environment variables are captured on the first
invocation of the builder (e.g make or ninja) instead of when CMake is invoked
into to build directory. This can lead to compilation errors (notably when
compiling with clang in the top directory due to the addition of the
`-Qunused-arguments` option).
This leads to an issue where I have a script that prepare the build directory
and export CXX within the script. When I jump in the build folder, there's a
mismatch between the external gbenchmark (and all deps if conda is not used)
compiler and the build.
To reproduce:
# Create a new build directory with clang as compiler, don't build yet
# In a new shell (without the compiler environment variable), go into directory
invoke make/ninja
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