[llvm-bugs] [Bug 33719] Libc++ shipped math.h and -isystem breakage

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33719

Dimitry Andric <dimitry at andric.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |dimitry at andric.com
         Resolution|---                         |INVALID

--- Comment #1 from Dimitry Andric <dimitry at andric.com> ---
The solution is simple: do not append -isystem /usr/include to your command
line.  If you do so, and want to compile C++ sources, you must also make sure
to add a -isystem option that points to your C++ headers, and *before* the
-isystem /usr/include option.

This -isystem option is sometimes added by Qt projects, for unknown reasons. 
(There is never a good reason, since /usr/include is always in the include
path, so adding it explicitly is superfluous at best, erroneous at worst.)

For Qt based project files (.pro or .pri), ensure the INCLUDEPATH variable does
*not* have /usr/include in it.

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