xerces-c: conan v2 support

[SpaceIm]

Specify library name and version: lib/1.0

This is also a good place to share with all of us why you are submitting this PR (specially if it is a new addition to ConanCenter): is it a dependency of other libraries you want to package? Are you the author of the library? Thanks!

---

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the conan-center hook activated.

[conan-center-bot]

All green in build 1 (e5428de101b1a846316b8c438f316366a8a0284f):

• xerces-c/3.2.3@:
  All packages built successfully! (All logs)

• xerces-c/3.2.2@:
  All packages built successfully! (All logs)

[github-actions]

Hooks produced the following warnings for commit e5428de

xerces-c/3.2.3

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c-3.2.so' links to system library 'm' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c.so' links to system library 'm' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c-3.2.so' links to system library 'nsl' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c.so' links to system library 'nsl' but it is not in cpp_info.system_libs.

xerces-c/3.2.2

post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c-3.2.so' links to system library 'm' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c.so' links to system library 'm' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c-3.2.so' links to system library 'nsl' but it is not in cpp_info.system_libs.
post_package(): WARN: [MISSING SYSTEM LIBS (KB-H043)] Library './lib/libxerces-c.so' links to system library 'nsl' but it is not in cpp_info.system_libs.

[jwillikers]

Suggested change

	raise ConanInvalidConfiguration(
	"Option '{option}={value}' is only supported on {os}".format(
	option=option, value=value, os=os
	)
	)
	raise ConanInvalidConfiguration(f"Option '{option}={value}' is only supported on {os}")

[goodtune]

An observation, would like some assistance in confirming our theory...

Since this new revision has been added we're finding that despite shared=False being a default option, the package that is produced contains .so files and not a .a file.

My colleague has suggested it is related to the use of CMakePresent.json which is a cmake feature introduced in version 3.19 -- https://cmake.org/cmake/help/latest/manual/cmake-presets.7.html

However, the official build containers (at least the one's that we're using) provide earlier versions.

In terms of evidence, here is what I observe from rrev 815aaa3f1604a5f7659a665a83053620:

[full_settings]
    arch=x86_64
    build_type=Release
    compiler=clang
    compiler.libcxx=libstdc++
    compiler.version=12
    os=Linux

[full_requires]


[full_options]
    char_type=uint16_t
    fPIC=True
    message_loader=inmemory
    mutex_manager=posix
    network_accessor=socket
    shared=False
    transcoder=gnuiconv

The lib contents of the package:

lib/libxerces-c-3.2.so: 7f6cf0c4ad2ebbd242cb797837b8e4d0
lib/libxerces-c.so: 7f6cf0c4ad2ebbd242cb797837b8e4d0

In rrev 1af5eb075b3a8ee232f43cc8288e17ed

[full_settings]
    arch=x86_64
    build_type=Release
    compiler=gcc
    compiler.libcxx=libstdc++
    compiler.version=11
    os=Linux

[full_requires]


[full_options]
    char_type=uint16_t
    fPIC=True
    message_loader=inmemory
    mutex_manager=posix
    network_accessor=socket
    shared=False
    transcoder=gnuiconv

The lib directory is different, and what I'd expect.

lib/libxerces-c.a: 51256496c5d2100322210c6ed0e1df39

In our experience, building from this recipe has caused our products to fail. They link, but we're getting a dynamic link a shared object which isn't available in our runtimes.

$ ./cmdline -v
./cmdline: error while loading shared libraries: libxerces-c-3.2.so: cannot open shared object file: No such file or directory

[SpaceIm]

It doesn't come from presets, but indeed there is an issue and it's because of https://github.com/apache/xerces-c/blob/v3.2.3/cmake/XercesDLL.cmake#L23 (see conan-io/conan#11937 & conan-io/conan#11840).

I've pushed a hotfix #13616