configure: check that C++ compiler actually works
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: NPeter Maydell <peter.maydell@linaro.org> Reported-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Reported-by: NThomas Huth <thuth@linux.vnet.ibm.com> Tested-by: NThomas Huth <thuth@linux.vnet.ibm.com> Tested-by: NAlexey Kardashevskiy <aik@ozlabs.ru> Message-id: 1392909016-14028-1-git-send-email-peter.maydell@linaro.org
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