[Bug libstdc++/40278] -std=c++0x is error, but -std=gnu++0x is OK!

[paolo dot carlini at oracle dot com]

------- Comment #10 from paolo dot carlini at oracle dot com  2010-02-18 10:12 -------
In short, I see two conceptually separate issues: 1- We run the configure tests
for those functions in GNU mode, thus if on a target an header doesn't declare
some functions in ISO strict mode, the user experiences puzzling errors, like
in Comment #1; 2- Specific to MingW (and Cygwin too?!?), those C99 names do not
correspond to functions implementing the actual C99 semantics, arguably should
indeed not be exposed in strict ISO mode.

Thus, my doubt is: should we actually run those configure tests in strict ISO
mode, instead of GNU mode? For Linux would not make a difference, and would
avoid puzzling errors like those experienced by MingW users. However, I'm
afraid some users, on other systems, could be disappointed in finding fewer
functions declared in the C++ headers (in namespace std) in GNU mode (which is
the default!)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40278