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Build 211 can build most things, but I've seen intermittent
miscompilation and slower code. Also it comes from Xcode 4.2, so most
people don't have it anyway. Let's use 218 as the minimum viable
version.
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Given the current state of OS X compilers, the original fails_with
behavior is becoming less useful, mostly resulting in build failures
each time the compiler is updated. So make the following changes:
When a build is specified, we retain the old behavior: switch compilers
if the available compiler is <= the build, don't switch if it is > the
build.
When no build is specified, unconditionally switch compilers, and don't
output the advice message. This allows us to mark formulae as
perpetually failing, avoiding the need to update formulae each time a
new compiler build is made available.
As a bonus, this makes the logic much easier to reason about.
Closes Homebrew/homebrew#18175.
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testing_env already requires utils; set up the ARGV and ENV extensions
there as well.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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MacOS.gcc_42_build_version is nil when not available, not 0
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Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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