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configure: check that C++ compiler actually works

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Check that the C++ compiler works with the C compiler; if it
does not, then don't pass CXX to the build process. This
fixes a regression where QEMU was no longer building if the
build environment didn't have a C++ compiler (introduced
in commit 3144f78b, which incorrectly assumed that rules.mak
would only see a non-empty $(CXX) if configure had actually
found a working C++ compiler).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reported-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Tested-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-id: 1392909016-14028-1-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2014-02-20 15:10:16 +00:00
parent 105a060188
commit 98b21dcdb3
1 changed files with 29 additions and 0 deletions
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29
configure vendored
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@ -1289,6 +1289,35 @@ else
error_exit "\"$cc\" either does not exist or does not work"
fi
# Check that the C++ compiler exists and works with the C compiler
if has $cxx; then
cat > $TMPC <<EOF
int c_function(void);
int main(void) { return c_function(); }
EOF
compile_object
cat > $TMPC <<EOF
extern "C" {
int c_function(void);
}
int c_function(void) { return 42; }
EOF
if (cc=$cxx do_cc $QEMU_CFLAGS -o $TMPE $TMPC $TMPO $LDFLAGS); then
# C++ compiler $cxx works ok with C compiler $cc
:
else
echo "C++ compiler $cxx does not work with C compiler $cc"
echo "Disabling C++ specific optional code"
cxx=
fi
else
echo "No C++ compiler available; disabling C++ specific optional code"
cxx=
fi
# Consult white-list to determine whether to enable werror
# by default. Only enable by default for git builds
z_version=`cut -f3 -d. $source_path/VERSION`