Update autoconf test for gcc to require 4.7 and up

Authored by trommler on Nov 6 2017, 1:29 PM.



Fixing Trac #14244 required the newer gcc atomic built-ins that are
provided from 4.7 and up. This updates the test to check for
minimum gcc version 4.7.

The version tests for 3.4 (!), 4.4, and 4.6 are no longer needed
and can be removed. This makes the build system simpler.

Test Plan


Diff Detail

rGHC Glasgow Haskell Compiler
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.
trommler created this revision.Nov 6 2017, 1:29 PM
bgamari accepted this revision.Nov 6 2017, 1:33 PM

Yay! Thanks @trommler.

This revision is now accepted and ready to land.Nov 6 2017, 1:33 PM
This revision was automatically updated to reflect the committed changes.