glib: conan v2 support

[SpaceIm]

closes #12890

---

• 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.

[ghost]

I detected other pull requests that are modifying glib/all recipe:

• glib: Fix libdir for PkgConfigDeps #13645
• glib: several fixes & improvements #13440
• glib: Fix test package to allow cross-compilation #13347

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[SpaceIm]

In test_package (relying on PkgConfigDeps generator & conan.tools.gnu.PkgConf):

ERROR: glib/2.73.0 (test package): Error in test() method, line 48
	self.run(f"{pkg_config.variables['gdbus_codegen']} -h", env="conanrun")
	ConanException: pkg-config command ['pkg-config', '--print-variables', 'gio-2.0', '--print-errors'] failed with error: Command 'pkg-config --print-variables gio-2.0 --print-errors' returned non-zero exit status 1.
Variable 'libdir' not defined in '/home/conan/w/prod/BuildSingleReference/conan-center-index/recipes/glib/all/test_package/build/generators/gio-2.0.pc'

test_v1_package seems to still work.

I guess it comes from the pkg_config_custom_content appended to gio-2.0 component. This custom content relies on ${libdir}, and maybe it's not something defined by PkgConfigDeps while it was in pkg_config. /cc @czoido

Indeed, example with zlib.pc generated by PkgConfigDeps on macOS:

prefix=/Users/spaceim/.conan/data/zlib/1.2.12/_/_/package/a7fb9a1b45a50aff01ad6102760c848ff2ac80df
libdir1=${prefix}/lib
includedir1=${prefix}/include

Name: zlib
Description: Conan package: zlib
Version: 1.2.12
Libs: -L"${libdir1}" -lz -F /Users/spaceim/.conan/data/zlib/1.2.12/_/_/package/a7fb9a1b45a50aff01ad6102760c848ff2ac80df/Frameworks 
Cflags: -I"${includedir1}" 

So now we have to find a pkg_config_custom_content in package_info() of glib compatible with both pkg_config & PkgConfigDeps.

[SpaceIm]

[204/501] Linking target glib/gtester
FAILED: glib/gtester 
cc  -o glib/gtester glib/gtester.p/gtester.c.o -Wl,-dead_strip_dylibs -Wl,-headerpad_max_install_names -Wl,-undefined,error -Wl,-framework,CoreFoundation -Wl,-framework,Carbon -Wl,-framework,Foundation -Wl,-framework,AppKit glib/libglib-2.0.a subprojects/proxy-libintl/libintl.a /Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/pcre/8.45/_/_/package/6b708b31085f36a04cd9dea85c6b67a06a563c31/lib/libpcre.a -F /Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/pcre/8.45/_/_/package/6b708b31085f36a04cd9dea85c6b67a06a563c31/Frameworks /Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/bzip2/1.0.8/_/_/package/75fe66fbfe61230e9fcbb361f13b6b3baa483e0a/lib/libbz2.a /Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/bzip2/1.0.8/_/_/package/75fe66fbfe61230e9fcbb361f13b6b3baa483e0a/Frameworks /Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/zlib/1.2.12/_/_/package/647afeb69d3b0a2d3d316e80b24d38c714cc6900/lib/libz.a -liconv -lm
clang: error: no such file or directory: '/Users/jenkins/w/prod/BuildSingleReference@3/.conan/data/bzip2/1.0.8/_/_/package/75fe66fbfe61230e9fcbb361f13b6b3baa483e0a/Frameworks'

waiting a fix for conan-io/conan#11867

[SpaceIm]

For comparison, 2 logs of the same configuration (macOS apple-clang 12, Release, static):

• from current PR: https://c3i.jfrog.io/c3i/misc/logs/pr/12221/6-configs/macos-clang/glib/2.70.4//3bd14e55c0125ea235d10fd5e6dda9d9a44ad21f-build.txt
• from recent successful PR (but conan v1 recipe) [glib] build as shared by default #12171: https://c3i.jfrog.io/c3i/misc/logs/pr/12171/9-configs/macos-clang/glib/2.70.4//3bd14e55c0125ea235d10fd5e6dda9d9a44ad21f-build.txt

In current PR, on macOS, intl (libgettext) is built, and it shouldn't. And I think that it links to system iconv instead of libiconv from conan.

[conan-center-bot]

Failure in build 8 (7b7e77bd522ae754cb0658aebef2712b482aac89):

• glib/2.71.3@:
  Didn't run or was cancelled before finishing

• glib/2.68.3@:
  Didn't run or was cancelled before finishing

• glib/2.70.4@:
  Didn't run or was cancelled before finishing

• glib/2.69.3@:
  CI failed to create some packages (All logs)

  Logs for packageID 57e2d4b1f9a9ecfacdab6950910cab10504ec625:

  [settings]
  arch=x86_64
  build_type=Debug
  compiler=apple-clang
  compiler.libcxx=libc++
  compiler.version=12.0
  os=Macos
  [options]
  glib:shared=False
  

  [...]
  [100%] Linking C executable bin/test_package
  CMake Warning:
    Manually-specified variables were not used by the project:
  
      CMAKE_EXPORT_NO_PACKAGE_REGISTRY
      CMAKE_INSTALL_BINDIR
      CMAKE_INSTALL_DATAROOTDIR
      CMAKE_INSTALL_INCLUDEDIR
      CMAKE_INSTALL_LIBDIR
      CMAKE_INSTALL_LIBEXECDIR
      CMAKE_INSTALL_OLDINCLUDEDIR
      CMAKE_INSTALL_SBINDIR
  
  
  /Users/jenkins/w/prod/BuildSingleReference/conan-center-index/recipes/glib/all/test_package/test_package.c:17:5: warning: ignoring return value of function declared with const attribute [-Wunused-value]
      g_module_supported();
      ^~~~~~~~~~~~~~~~~~
  1 warning generated.
  Undefined symbols for architecture x86_64:
    "_g_libintl_bind_textdomain_codeset", referenced from:
        _ensure_gettext_initialized in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_bindtextdomain", referenced from:
        _ensure_gettext_initialized in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_dcgettext", referenced from:
        _g_dcgettext in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_dgettext", referenced from:
        _g_dgettext in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_dngettext", referenced from:
        _g_dngettext in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_gettext", referenced from:
        __g_dgettext_should_translate in libglib-2.0.a(ggettext.c.o)
    "_g_libintl_textdomain", referenced from:
        __g_dgettext_should_translate in libglib-2.0.a(ggettext.c.o)
    "_iconv", referenced from:
        _g_iconv in libglib-2.0.a(gconvert.c.o)
       (maybe you meant: _g_convert_with_iconv, _g_iconv_close , _g_iconv , _g_iconv_open )
    "_iconv_close", referenced from:
        _g_iconv_close in libglib-2.0.a(gconvert.c.o)
       (maybe you meant: _g_iconv_close)
    "_iconv_open", referenced from:
        _try_conversion in libglib-2.0.a(gconvert.c.o)
       (maybe you meant: _g_iconv_open)
  ld: symbol(s) not found for architecture x86_64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  make[2]: *** [bin/test_package] Error 1
  make[1]: *** [CMakeFiles/test_package.dir/all] Error 2
  make: *** [all] Error 2
  ERROR: glib/2.69.3 (test package): Error in build() method, line 22
  	cmake.build()
  	ConanException: Error 2 while executing cmake --build '/Users/jenkins/w/prod/BuildSingleReference/conan-center-index/recipes/glib/all/test_v1_package/build/e652c92c0e7aae383558782458fc2019b679639b' '--' '-j4'
  

• glib/2.72.1@:
  Didn't run or was cancelled before finishing

• glib/2.73.0@:
  Didn't run or was cancelled before finishing

• glib/2.73.3@:
  Didn't run or was cancelled before finishing

• glib/2.73.2@:
  Didn't run or was cancelled before finishing

• glib/2.73.1@:
  Didn't run or was cancelled before finishing

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