This is more reliable than using which, which doesn't work if the CXX
environment variable is set to something else than an executable (e.g
contains options), and is apparently less portable on some systems.

See:

• http://lists.geany.org/pipermail/devel/2009-September/001367.html, which lead to 5bb2882.
• https://sourceforge.net/p/geany/bugs/455/, which lead to a revert of the above, 5b9605a.

Fixes #829.

You can view, comment on, or merge this pull request online at:

  https://github.com/geany/geany/pull/1155

Commit Summary

• Test whether the C++ compiler works by compiling a test program

File Changes

• M configure.ac (6)
• A m4/geany-prog-cxx.m4 (20)

Patch Links:

• https://github.com/geany/geany/pull/1155.patch
• https://github.com/geany/geany/pull/1155.diff

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