http://llvm.org/bugs/show_bug.cgi?id=20435
Bug ID: 20435
Summary: CMake: native llvm-tblgen: Endless reconfigure-loop in
parallel build
Product: Build scripts
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: cmake
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
If calling cmake with "-DCMAKE_SYSTEM_NAME=Linux" (compiling in cross-mode
[1]), the "native llvm-tblgen" will be created. This will cause endless rerun
of the cmake-target for "ConfigureNativeTableGen" when compiling in parallel
build. The dependencies of later targets depending on the TableGen are not set
correctly?
Reproduce:
cmake -DCMAKE_SYSTEM_NAME=Linux ../path/to/CMakeLists.txt
make -j9
...endless-loop, finally build error...
Workaround:
build single-threaded
Tested: "release_34", "release_33" and "master"
[1] CMake is setting "CMAKE_CROSSCOMPILING" to "True" if the CMAKE_SYSTEM_NAME
is set. Your CMakeLists then checks this Variable and creates the native
TableGen.
->
https://github.com/Kitware/CMake/blob/master/Modules/CMakeDetermineSystem.cmake#L115
Greetings
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