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configure: disallow ccache during compile tests

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If the user is using ccache during the configuration step,
it may interfere with some of the configuration tests,
particularly the "Is ccache interfering with macro analysis" step,
which is a bit of a poetic problem.

1) Disallow ccache from reading from the cache during configure,
   but don't disable it entirely to allow us to see if it causes other
   problems.

2) Force off CCACHE_CPP2 during the ccache test to get a deterministic
   answer over whether or not we need to enable that feature later.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <1446055000-29150-1-git-send-email-jsnow@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
John Snow 2015-10-28 13:56:40 -04:00 committed by Paolo Bonzini
parent 0448f5f8b8
commit 5e4dfd3d4e
1 changed files with 4 additions and 0 deletions
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4
configure vendored
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@ -8,6 +8,9 @@
CLICOLOR_FORCE= GREP_OPTIONS= CLICOLOR_FORCE= GREP_OPTIONS=
unset CLICOLOR_FORCE GREP_OPTIONS unset CLICOLOR_FORCE GREP_OPTIONS
# Don't allow CCACHE, if present, to use cached results of compile tests!
export CCACHE_RECACHE=yes
# Temporary directory used for files created while # Temporary directory used for files created while
# configure runs. Since it is in the build directory # configure runs. Since it is in the build directory
# we can safely blow away any previous version of it # we can safely blow away any previous version of it
@ -4412,6 +4415,7 @@ fi
# check if ccache is interfering with # check if ccache is interfering with
# semantic analysis of macros # semantic analysis of macros
unset CCACHE_CPP2
ccache_cpp2=no ccache_cpp2=no
cat > $TMPC << EOF cat > $TMPC << EOF
static const int Z = 1; static const int Z = 1;