travis: try to use precompiled SCIP on OS X

[rschwarz]

No description provided.

[codecov]

Codecov Report

Merging #143 into master will increase coverage by 0.89%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #143      +/-   ##
==========================================
+ Coverage   88.37%   89.26%   +0.89%     
==========================================
  Files          21       21              
  Lines         800      792       -8     
==========================================
  Hits          707      707              
+ Misses         93       85       -8

Impacted Files	Coverage Δ
src/MOI_wrapper.jl	92.1% <0%> (+1.19%)	⬆️
src/managed_scip.jl	95.65% <0%> (+1.36%)	⬆️
src/MOI_wrapper/variable.jl	87.7% <0%> (+2.1%)	⬆️
src/conshdlr.jl	87.5% <0%> (+3.5%)	⬆️

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[rschwarz]

Travis can not find the libscip.dylib of the precompiled SCIP:

┌ Error: Error building `SCIP`: 
│ ERROR: LoadError: Unable to locate SCIP installation.
│ Tried:
│ 	/Users/travis/build/SCIP-Interfaces/SCIP.jl/install/bin/libscip.dylib
│ 	/Users/travis/build/SCIP-Interfaces/SCIP.jl/install/lib/libscip.dylib
│ 	libscip.dylib

Just like in #142.

[fserra]

interesting. As a patch, maybe you can try adding the library path to DYLD_LIBRARY_PATH

[rschwarz]

As a patch, maybe you can try adding the library path to DYLD_LIBRARY_PATH

This was not necessary before, when building SCIP from source. But feel free to try stuff :-) You should be able to push to this branch.

The current travis script does not print the actual contents of install/lib, but libscip.dylib should be there (I extracted locally).

[rschwarz]

In PR #110, when using the precompiled binaries on OS X, there was an illegal instruction in SoPlex/GMP. Maybe this is fixed with 6.0.2, or maybe some related problem is causing dlopen to fail.