Error: dyld: Library not loaded: /usr/local/lib/libisl.10.dylib about homebrew-avr

[ladislas]

@adrianawise we do not support avr-gcc 7 yet and isl has been removed from the formula a long time ago.

are you sure your comment is related to avr?

[larsimmisch]

I can reproduce this after a brew update; brew upgrade; brew cleanup. I'll take a look at it and maybe update gcc while I am at it.

[larsimmisch]

Sigh. gcc 5.1 is problematic; I can't get it to compile, it crashes in gen-avr-mmcu-specs.

See https://www.mail-archive.com/[email protected]/msg454439.html and also, related, http://savannah.nongnu.org/bugs/?44869

[larsimmisch]

I have given gcc 5.1 another serious try and I could get it to cross-compile for AVR - but it was not of much use - I couldn't use that avr-gcc to compile my test programs.

There is a pretty prominent warning about gcc 5.1 and AVR-LibC in https://gcc.gnu.org/gcc-5/changes.html:

If the compiler is used together with AVR-LibC, this requires at least GCC 5.2 and a version of AVR-
LibC which implements feature #44574.

And, to answer @ladislas question: I don't think we need --with-isl. It enables some clever loop optimizations, so we want it eventually, but for the time being, we should just get the recipes back in working order.

[ladislas]

thanks @larsimmisch for trying this out! I guess we'll have to wait for gcc 5.2 then ;)

I agree that ISL is not really needed right now. I'm not an expert, but as far as I understand, it is only useful for very complexe applications that need a lot of optimization. So it might not be really useful for avr...

[DouglasUrner]

For whatever it might be worth, this problem still exists (wrong version of libisl). It would be nice to have slightly clearer instructions on how to use the older version.

[DouglasUrner]

This is how I modified the avr-gcc formula to use the older ISL:

1. brew tap homebrew/versions
2. brew edit avr-gcc
3. Change the two instances of 'isl' to 'isl012'
4. brew reinstall avr-gcc

[FrancescoBorzi]

I have the same problem using gcc 4.9 or 5.2, but with gcc 5.3 is fine

[adrianawise]

After I upgraded to gcc 7.1.0, I was still getting the following error:

dyld: Library not loaded: /usr/local/lib/libisl.10.dylib

I just replaced every instance of libisl.10.dylib with libisl.15.dylib, which is the version installed for MacOS Sierra 10.12.5, in the binary files:

/usr/local/Cellar/gfortran/4.8.2/gfortran/libexec/gcc/x86_64-apple-darwin13.0.0/4.8.2/f951
/usr/local/lib/libcloog-isl.4.dylib

This fixed the build for lapack-3.7.1 for me on a MacOS Sierra 10.12.5. I had already built blas-3.7.1. After this, lapackpp-2.5.4 gave me no trouble.