[bug-gnu-libiconv] Support for cross-platform builds via CMake

[Markus Rickert]

Hello,

would there be an interest in improving support for cross-platform 
builds by adding CMake build files to libiconv?

libiconv is one of the dependency of libxml2, which has recently added 
CMake files to simplify support for cross-platform builds. Its other 
dependencies zlib and liblzma, together with libxslt support CMake as 
well, therefore it would be great if libiconv could be built in a 
similar fashion.

I've created a fork to show how this would look like [1]. It enables 
building the libiconv and libcharset libraries via the following commands:

mkdir build
cd build
cmake -G "Visual Studio 16 2019" -A x64 ..
cmake --build . --config Release

This includes generating files via genaliases, genaliases2, genflags, 
and gentranslit. The iconv program is not built at the moment. Binary 
archives, Debian and RPM packages, as well as NSIS and WIX installers 
can be generated via CPack.

The build requires the gperf executable for generating the aliases, a 
CMake port for this is also available [2].

Best regards,

Markus Rickert

[1] https://github.com/roboticslibrary/libiconv/tree/cmake
[2] https://github.com/roboticslibrary/gperf/tree/cmake

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