[petsc-dev] defaulting gnu compilers on Apple

[Aron Ahmadia]

~/s/s/w/tmp ❯❯❯ clang -fsel-sched-pipelining file.c

 ⏎
clang: warning: argument unused during compilation: '-fsel-sched-pipelining'
~/s/s/w/tmp ❯❯❯ gcc -fsel-sched-pipelining file.c

 ⏎
clang: warning: argument unused during compilation: '-fsel-sched-pipelining'

~/s/s/w/tmp ❯❯❯ gcc --analyze file.c
~/s/s/w/tmp ❯❯❯ clang --analyze file.c
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