[pkg-config] Add new port

ports/pkg-config/CONTROL

@@ -0,0 +1,5 @@
+Source: pkg-config
+Version: 0.29.2 
+Homepage: https://gitlab.freedesktop.org/pkg-config/pkg-config
+Description: pkg-config is a script to make putting together all the build flags when compiling/linking a lot easier.
+Build-Depends: glib[core]

ports/pkg-config/portfile.cmake

@@ -0,0 +1,49 @@
+set(VCPKG_POLICY_EMPTY_INCLUDE_FOLDER enabled) # Tool build no library or includes
+
+vcpkg_from_gitlab(
+    GITLAB_URL https://gitlab.freedesktop.org/
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO pkg-config/pkg-config
+    REF  edf8e6f0ea77ede073f07bff0d2ae1fc7a38103b #v0.29.2
+    SHA512 537bace09ff183ec793587fc7cf091d75cd5ec34efc1261227de70a15631f40558528f19dbe9e3f2eb8bc24bed21003a01c7766c849ae498031c0c1ae322e314
+    HEAD_REF master
+) 
+
+# Remove if GLIB installs a *.pc file or keep it to make it independent of pkg-config itself
+set(GLIBS "-lglib-2.0 -lgio-2.0 -lgmodule-2.0 -lgobject-2.0 -lgthread-2.0")
+if(VCPKG_TARGET_IS_WINDOWS)
+    set(GLIB_LIBS_DEBUG "-L${CURRENT_INSTALLED_DIR}/debug/lib ${GLIBS} -lzlibd")
+    set(GLIB_LIBS_RELEASE "-L${CURRENT_INSTALLED_DIR}/lib ${GLIBS} -lzlib")
+else()
+    set(GLIB_LIBS_DEBUG "-L${CURRENT_INSTALLED_DIR}/lib ${GLIBS} -lz -pthread")
+    set(GLIB_LIBS_RELEASE "-L${CURRENT_INSTALLED_DIR}/lib ${GLIBS} -lz -pthread")
+endif()
+
+set(ENV{GLIB_CFLAGS} "-I${CURRENT_INSTALLED_DIR}/include")
+vcpkg_configure_make(
+    SOURCE_PATH ${SOURCE_PATH}
+    AUTOCONFIG
+    CONFIG_DEPENDENT_ENVIROMNENT "GLIB_LIBS"
+)
+
+vcpkg_install_make()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/tools/${PORT}/debug) # no need for debug tools
+
+vcpkg_copy_tool_dependencies(${CURRENT_PACKAGES_DIR}/tools/${PORT}/bin)
+
+# # Handle copyright
+file(INSTALL "${SOURCE_PATH}/COPYING" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)
+
+# pkg-config depends on glib.  Note that glib build-depends on pkg-config,
+# but you can just set the corresponding environment variables (ZLIB_LIBS,
+# ZLIB_CFLAGS are the only needed ones when this is written) to build it.
+
+# pkg-config also either needs an earlier version of itself to find glib
+# or you need to set GLIB_CFLAGS and GLIB_LIBS to the correct values for
+# where it's installed in your system.
+
+# If this requirement is too cumbersome, a bundled copy of a recent glib
+# stable release is included. Pass --with-internal-glib to configure to
+# use this copy.

scripts/ci.baseline.txt

@@ -1431,6 +1431,8 @@ pixel:x64-windows=fail
 pixel:x64-windows-static=fail
 pixel:x86-windows=fail
 pixel:x64-linux=ignore
+# Make currently does not support crosscompile. 
+pkg-config:arm64-windows=fail
 platform-folders:arm-uwp=fail
 platform-folders:x64-uwp=fail
 plib:arm-uwp=fail

scripts/cmake/vcpkg_configure_make.cmake

@@ -44,6 +44,11 @@
 ## ### OPTIONS_DEBUG
 ## Additional options passed to configure during the Debug configuration. These are in addition to `OPTIONS`.
 ##
+## ### CONFIG_DEPENDENT_ENVIROMNENT
+## List of additional configuration dependent enviroment variables to set. 
+## Pass SOMEVAR to set the enviroment and have SOMEVAR_(DEBUG|RELEASE) set in the portfile to the appriopiate values
+## General enviromnent variables can be set from within the portfile itself. 
+##
 ## ## Notes
 ## This command supplies many common arguments to configure. To see the full list, examine the source.
 ##
@@ -110,7 +115,7 @@ function(vcpkg_configure_make)
     cmake_parse_arguments(_csc
         "AUTOCONFIG;SKIP_CONFIGURE;COPY_SOURCE"
         "SOURCE_PATH;PROJECT_SUBPATH;PRERUN_SHELL"
-        "OPTIONS;OPTIONS_DEBUG;OPTIONS_RELEASE"
+        "OPTIONS;OPTIONS_DEBUG;OPTIONS_RELEASE;CONFIG_DEPENDENT_ENVIROMNENT"
         ${ARGN}
     )
     # Backup enviromnent variables
@@ -421,6 +426,12 @@ function(vcpkg_configure_make)
     endif()
 
     foreach(_buildtype IN LISTS _buildtypes)
+        foreach(ENV_VAR ${_csc_CONFIG_DEPENDENT_ENVIROMNENT})
+            if(ENV{${ENV_VAR}})
+                set(BACKUP_CONFIG_${ENV_VAR} "$ENV{${ENV_VAR}}")
+            endif()
+            set(ENV{${ENV_VAR}} "${${ENV_VAR}_${_buildtype}}")
+        endforeach()
         set(TAR_DIR "${CURRENT_BUILDTREES_DIR}/${TARGET_TRIPLET}-${SHORT_NAME_${_buildtype}}")
         file(MAKE_DIRECTORY "${TAR_DIR}")
         file(RELATIVE_PATH RELATIVE_BUILD_PATH "${TAR_DIR}" "${SRC_DIR}")
@@ -477,6 +488,14 @@ function(vcpkg_configure_make)
             unset(ENV{PKG_CONFIG_PATH})
         endif()
         unset(BACKUP_ENV_PKG_CONFIG_PATH_${_buildtype})
+
+        foreach(ENV_VAR ${_csc_CONFIG_DEPENDENT_ENVIROMNENT})
+            if(BACKUP_CONFIG_${ENV_VAR})
+                set(ENV{${ENV_VAR}} "${BACKUP_CONFIG_${ENV_VAR}}")
+            else()
+                unset(ENV{${ENV_VAR}})
+            endif()
+        endforeach()
     endforeach()
 
     # Restore enviromnent