[DM-6126] Add patch to fix building with GCC 5.x on modern linux distributions.

[jmatt]

Add a patch to address this compiler error which happens on Ubuntu 16.04 due to GCC 5.x incompatibility:

'''
permutedsort.c:125:2: error: non-floating-point argument in call to function '__builtin_isnan'
COMPARE(f1, f2, <, >);
...
permutedsort.c:131:2: error: non-floating-point argument in call to function '__builtin_isnan'
COMPARE(f1, f2, >, <);
'''

Mailing list discussion

GitHub commit

[timj]

Can you confirm that this is compiler version related and not ubuntu as such? If it's an issue with a modern GCC then can you please make that the commit message (maybe with body of the message indicating that it was first discovered in Ubuntu 16.04).

[timj]

oh, and the words in this PR should be in the commit message.

[jmatt]

I've updated the commit, PR comment and title to reference GCC 5.x.

[timj]

Much better, but the commit message body is still missing the provenance information from the PR text.

[timj]

Ok. It's merged. Too late 😄

[jmatt]

Yeah we'll clear it up so I can do it in the future.