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| author | Peter Maydell <peter.maydell@linaro.org> | 2014-02-20 15:10:16 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2014-02-24 14:53:27 +0000 |
| commit | 98b21dcdb331798709edafcd65b5b7a1e07302db (patch) | |
| tree | 20a6c1c767dae0e6bf36709a16edce2c9c870e09 | |
| parent | 105a060188dc6fdd4551571a966514d1a5f6815a (diff) | |
| download | focaccia-qemu-98b21dcdb331798709edafcd65b5b7a1e07302db.tar.gz focaccia-qemu-98b21dcdb331798709edafcd65b5b7a1e07302db.zip | |
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 $(CXX) if configure had actually found a working C++ compiler). Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reported-by: Thomas Huth <thuth@linux.vnet.ibm.com> Tested-by: Thomas Huth <thuth@linux.vnet.ibm.com> Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru> Message-id: 1392909016-14028-1-git-send-email-peter.maydell@linaro.org
| -rwxr-xr-x | configure | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/configure b/configure index 39f2a1acd2..352a9c79c3 100755 --- a/configure +++ b/configure @@ -1289,6 +1289,35 @@ else error_exit "\"$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` |