[Octave-patch-tracker] [patch #8906] configure check support for c11 and c++11

[Carnë Draug]

Follow-up Comment #8, patch #8906 (project octave):

Speaking with Mike Miller on IRC, we came up with the following solution:


octave_save_CXXFLAGS=$CXXFLAGS
AX_CXX_COMPILE_STDCXX([11], [ext], [optional])
CXX11_SWITCH=$(echo "$CXXFLAGS" | $SED "s,^$octave_save_CXXFLAGS ,,")
XTRA_CXXFLAGS="$XTRA_CXXFLAGS $CXX11_SWITCH"


This has the following properties:

0 whatever CXXFLAGS we get at the start are used by AX_CXX_COMPILE_STDCXX
(because they affect the result of the test, e.g., maybe there's no need to
add any flag at all)
0 whatever flag AX_CXX_COMPILE_STDCXX adds to CXXFLAGS is kept there for
future configure checks
0 only the new flags added by AX_CXX_COMPILE_STDCXX get added to
XTRA_CXXFLAGS

If this is good, then I will work in a AX_CC_COMPILE_STDCC macro

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