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provide an error at at configure time if gcc, and g++ point to a mixture of clang and gcc. Fixes issue #10959

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Signed-off-by: Carter Tazio Schonwald <carter.schonwald@gmail.com>
This commit is contained in:
Carter Tazio Schonwald 2013-12-14 02:59:40 -05:00
parent 8d52dfbace
commit d952553048
1 changed files with 21 additions and 0 deletions
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21
configure vendored
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@ -559,6 +559,27 @@ then
step_msg "on OS X 10.9, forcing use of clang"
CFG_ENABLE_CLANG=1
putvar CFG_ENABLE_CLANG
else
# on OS X, with xcode 5 and newer, certain developers may have
# cc, gcc and g++ point to a mixture of clang and gcc
# if so, this will create very strange build errors
# this last stanza is to detect some such problems and save the future rust
# contributor some time solving that issue.
# this detection could be generalized to other OSes aside from OS X
# but the issue seems most likely to happen on OS X
chk_cc () {
$1 --version 2> /dev/null | grep -q $2
}
# check that gcc, cc and g++ all point to the same compiler.
# note that for xcode 5, g++ points to clang, not clang++
if !((chk_cc gcc clang && chk_cc g++ clang) ||
(chk_cc gcc gcc &&( chk_cc g++ g++ || chk g++ gcc))) then
err "the gcc and g++ in your path point to different compilers.
Check which versions are in your path with cc --version and g++ --version.
To resolve this problem, either fix your PATH or run configure with --enable-clang"
fi
fi
fi