This is cxx extension

[remicollet]

Fix PHP_NEW_EXTENSION to use C++ linker, so there is no need to add libstdc++ which is present by default with cxx command.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.63%. Comparing base (5187cc0) to head (0adff49).
Report is 12 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #655      +/-   ##
==========================================
- Coverage   80.79%   80.63%   -0.16%     
==========================================
  Files          22       22              
  Lines        1536     1539       +3     
  Branches      165      166       +1     
==========================================
  Hits         1241     1241              
- Misses        162      164       +2     
- Partials      133      134       +1     

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[eeliu]

@remicollet Can you resolve this conflicts ?

[remicollet]

Rebased

[remicollet]

Notice: without this change, the build will be broken on RHEL and clones when using alternative GCC versions (gcc-toolset) which may need additional static libraries only added when invoked as cxx (so libstdc++ is not enough)

[eeliu]

LGTM