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superenv: refurbish --fast-math for :clang

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"--fast-math" caused build failure with clang for
homebrew/science/delly-0.7.2

Apparently, clang only likes this option when it's referred to as
"-ffast-math"

Closes Homebrew/homebrew#50507.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>
This commit is contained in:
ilovezfs 2016-03-29 00:52:52 -07:00 committed by Xu Cheng
parent 63c0a9fa92
commit ebfd096826
1 changed files with 3 additions and 0 deletions
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3
Library/ENV/4.3/cc
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@ -158,6 +158,9 @@ class Cmd
"-fuse-linker-plugin" "-fuse-linker-plugin"
# clang doesn't support these flags # clang doesn't support these flags
args << arg unless tool =~ /^clang/ args << arg unless tool =~ /^clang/
when "--fast-math"
arg = "-ffast-math" if tool =~ /^clang/
args << arg
when "-Wno-deprecated-register" when "-Wno-deprecated-register"
# older gccs don't support these flags # older gccs don't support these flags
args << arg unless tool =~ /^g..-4.[02]/ args << arg unless tool =~ /^g..-4.[02]/