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Tips for compiling LEMON with gcc-9?


The lemon 1.3.1 source package for Debian no longer builds as Debian has upgraded to GCC 9.

Here is the original report:


Adding '-std=c++2a' to the CXXFLAGS makes the compilation succeed, but then one of the tests fail:

26: Test command: /build/liblemon-1.3.1+dfsg/obj-x86_64-linux-gnu/test/lgf_reader_writer_test
26: Test timeout computed to be: 10000000
26: terminate called after throwing an instance of 'lemon::FormatError'
26:   what():  lemon:FormatError: Item not found
26/44 Test #26: lgf_reader_writer_test ...........Child aborted***Exception:   0.17 sec

I also tested the latest code from the HG repository at http://lemon.cs.elte.hu/hg/lemon/archive/ed2c21cbd6ef.tar.bz2 (corresponding to the tip of the 1.3 branch) and had the same results. While it doesn't need '-std=c++2a'in CXXFLAGS, it still has the same test failure as above.

Any hints for getting LEMON to compile with gcc-9 are very appreciated!

Michael R. Crusoe

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