On Thu, 20 Feb 2014 15:10:16 +0000 Peter Maydell <peter.mayd...@linaro.org> wrote:
> 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 $(CXX) if configure had actually > found a working C++ compiler). > > Signed-off-by: Peter Maydell <peter.mayd...@linaro.org> > Reported-by: Alexey Kardashevskiy <a...@ozlabs.ru> > Reported-by: Thomas Huth <th...@linux.vnet.ibm.com> > --- > Apologies for the breakage for people who were building in > setups with no C++ compiler -- I should have tested the > original change more thoroughly. > > configure | 29 +++++++++++++++++++++++++++++ > 1 file changed, 29 insertions(+) > > diff --git a/configure b/configure > index 4648117..6829cbb 100755 > --- a/configure > +++ b/configure > @@ -1289,6 +1289,35 @@ else > error_exit "\"$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` Works fine for me now on my system w/o C++ compiler: Tested-by: Thomas Huth <th...@linux.vnet.ibm.com>