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Bug
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Resolution: Fixed
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Normal
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None
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None
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None
Trying to compile a C++ translation unit that uses C++17 STL parallelism fails with gcc 9.1:
#include <execution> int main() { return 0; }
$ g++ test.c++ -o test -std=c++17
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/9.1.1/include/g++-v9.1.1/pstl/parallel_backend.h:14,
from /usr/lib/gcc/x86_64-pc-linux-gnu/9.1.1/include/g++-v9.1.1/pstl/algorithm_impl.h:25,
from /usr/lib/gcc/x86_64-pc-linux-gnu/9.1.1/include/g++-v9.1.1/pstl/glue_execution_defs.h:52,
from /usr/lib/gcc/x86_64-pc-linux-gnu/9.1.1/include/g++-v9.1.1/execution:32,
from test.c++:2:
/usr/lib/gcc/x86_64-pc-linux-gnu/9.1.1/include/g++-v9.1.1/pstl/parallel_backend_tbb.h:19:10: fatal error: tbb/blocked_range.h: No such file or directory
19 | #include <tbb/blocked_range.h>
| ^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
The way to get it to work is to emerge dev-cpp/tbb and then link against it:
$ g++ test.c++ -o test -std=c++17 -ltbb
As STL parallelism is a core feature of C++17 I think it should work out of the box, i.e. sys-devel/gcc should (runtime) depend on dev-cpp/tbb.
