Re: can't compile `stdlib.h` on mxe

[Bruno Haible]

Hi Werner,

> While compiling my `ttfautohint` package with a slightly tailored mxe
> build, I get the following compilation error:
> 
>   CXX      ttfautohintGUI-ddlineedit.moc.o
> In file included from 
> /home/wl/git/mxe/usr/lib/gcc/i686-w64-mingw32.static/5.5.0/include/c++/cwchar:44:0,
>                  from 
> /home/wl/git/mxe/usr/lib/gcc/i686-w64-mingw32.static/5.5.0/include/c++/bits/postypes.h:40,
>                  from 
> /home/wl/git/mxe/usr/lib/gcc/i686-w64-mingw32.static/5.5.0/include/c++/iosfwd:40,
>                  from 
> /home/wl/git/mxe/usr/lib/gcc/i686-w64-mingw32.static/5.5.0/include/c++/memory:72,
>                  from ddlineedit.moc.cpp:9:
> ../gnulib/src/stdlib.h:1904:1: error: expected ',' or '...' before 'string'
>  _GL_FUNCDECL_RPL (strtoull, unsigned long long,
>  ^
> 
> Attached is the built `stdlib.h` file, together with the used
> `bootstrap.conf`.  Please advise.

The error message "expected ',' or '...' before 'string'" points to a problem
with the 'restrict' keyword.

An appropriate definition of 'restrict' should be available in the gnulib-
generated config.h file.

* Can you verify that ddlineedit.moc.cpp starts with a '#include <config.h>'
  statement? [1]

* Can you show the block of preprocessor statements in <config.h> that
  defines 'restrict'?

* Can you show the command that is being executed (make V=1)? A symbolic
  placeholder like 'CXX' is useless for debugging a compilation failure.

* What are the C compiler and C++ compiler versions that you use in this
  build?

Bruno

[1] https://www.gnu.org/software/gnulib/manual/html_node/Source-changes.html