#2113 WSL: glob implementation needs trampolines

[Keith Marshall]

libmingwex.a provides an implementation of the POSIX glob() function, and its complement, globfree(), under the private names __mingw_glob() and __mingw_globfree() respectively. The accompanying header, glob.h, maps each of the formal POSIX function names to its private implementation, via an __always_inline__ wrapper.

While this stratagem does provide a functional implementation, it does not expose public symbols for the formal POSIX function names. This makes it impossible for an application to obtain the address of either function, without detailed implementation specific knowledge of the private function names; consequently, the implementation lacks portability. Furthermore, the lack of exposure of the formal POSIX function names defeats detection by project configuration management tools, such as GNU autoconf.

To resolve such issues, the library should also provide separate stubs, defining public symbols for each of the formal POSIX function names, and each serving as a trampoline redirecting execution to its respective private function implementation.

[Keith Marshall]

Attached patch provides a resolution for this. It follows the series:--

1. dirent-2106.patch [#2106]
2. issue-2098.patch [#2098]
3. issue-2112.patch [#2112]
4. issue-2113.patch (this patch)

[Keith Marshall]

This is fixed in WSL/legacy, and will be included in the next release of mingwrt-3.x