gcc49: Graphite loop optimizations cannot be used

[hiro.masa.yoshi.moto@…]

gcc49 can not use graphite loop optimizations.

For example, I can not use "-floop-parallelize-all" optimization as follows:

 $ echo "int main(){return 0;}" | gcc-mp-4.9 -floop-parallelize-all  -xc - 

 <stdin>:1:0: sorry, unimplemented: Graphite loop optimizations cannot be used
 (-fgraphite, -fgraphite-identity, -floop-block, -floop-interchange, -floop-strip-mine, -floop-parallelize-all, and -ftree-loop-linear)

This error is caused by isl library. While macports uses isl-0.13, it is not officially supported yet by gcc.

I found a workaround and fixed Portfiles. Please check attached files for details.

[mf2k (Frank Schima)]

Thanks. In the future, please Cc the port maintainers (port info --maintainers gcc49).

[ryandesign (Ryan Carsten Schmidt)]

Since this is a runtime problem, the port's revision needs to be increased.

Does this problem exist in older or newer versions of gcc as well, or only in gcc49?

[hiro.masa.yoshi.moto@…]

gcc48 has same problem.

I prepared a patch for gcc-4.8. Please use attached file, gcc48-isl-0.13-compat.diff

[chrstphrchvz (Christopher Chavez)]

I think this has already been fixed; gcc49 has since been updated to use isl18. (gcc48 also now uses isl14; see #53662.)