[libxml2] Configure pkgconfig, xml2-config, and xml2Conf.sh file

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 296ab61e1c8f5dd9155c85ffb1a0cd368a54ea8b
Author: Markus Rickert <rickert fortiss org>
Date:   Thu Nov 19 22:06:36 2020 +0100

    Configure pkgconfig, xml2-config, and xml2Conf.sh file

 CMakeLists.txt | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
---
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 21a7871b..3f7e5c7c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -417,6 +417,7 @@ add_library(LibXml2 ${LIBXML2_HDRS} ${LIBXML2_SRCS})
 
 if(NOT BUILD_SHARED_LIBS)
        target_compile_definitions(LibXml2 INTERFACE LIBXML_STATIC)
+       set(XML_CFLAGS "-DLIBXML_STATIC")
 endif()
 
 if(LIBXML2_WITH_THREADS)
@@ -436,38 +437,53 @@ target_include_directories(
 
 if(HAVE_DLOPEN)
        target_link_libraries(LibXml2 PRIVATE dl)
+       set(MODULE_PLATFORM_LIBS "-ldl")
 endif()
 
 if(HAVE_SHLLOAD)
        target_link_libraries(LibXml2 PRIVATE dld)
+       set(MODULE_PLATFORM_LIBS "-ldld")
 endif()
 
 if(UNIX)
        target_link_libraries(LibXml2 PRIVATE m)
+       set(M_LIBS "-lm")
 endif()
 
 if(WIN32)
        target_link_libraries(LibXml2 PRIVATE ws2_32)
+       set(WIN32_EXTRA_LIBADD "-lws2_32")
 endif()
 
 if(LIBXML2_WITH_ICONV)
        target_link_libraries(LibXml2 PUBLIC Iconv::Iconv)
+       if(NOT Iconv_IS_BUILT_IN)
+               set(ICONV_LIBS "-liconv")
+       endif()
 endif()
 
 if(LIBXML2_WITH_ICU)
        target_link_libraries(LibXml2 PRIVATE ICU::i18n)
+       if(WIN32)
+               set(ICU_LIBS "-licudt -licuin -licuuc")
+       else()
+               set(ICU_LIBS "-licudata -licui18n -licuuc")
+       endif()
 endif()
 
 if(LIBXML2_WITH_LZMA)
        target_link_libraries(LibXml2 PRIVATE LibLZMA::LibLZMA)
+       set(LZMA_LIBS "-llzma")
 endif()
 
 if(LIBXML2_WITH_THREADS)
        target_link_libraries(LibXml2 PRIVATE Threads::Threads)
+       set(THREAD_LIBS ${CMAKE_THREAD_LIBS_INIT})
 endif()
 
 if(LIBXML2_WITH_ZLIB)
        target_link_libraries(LibXml2 PRIVATE ZLIB::ZLIB)
+       set(Z_LIBS "-lz")
 endif()
 
 set_target_properties(
@@ -685,6 +701,30 @@ if(LIBXML2_WITH_PYTHON)
        configure_file(python/setup.py.in setup.py @ONLY)
 endif()
 
+set(XML_INCLUDEDIR "-I\${includedir}/libxml2")
+set(XML_LIBDIR "-L\${libdir}")
+set(XML_LIBS "-lxml2")
+set(XML_PRIVATE_LIBS "${Z_LIBS} ${LZMA_LIBS} ${THREAD_LIBS} ${ICONV_LIBS} ${ICU_LIBS} ${M_LIBS}")
+
+file(RELATIVE_PATH PACKAGE_RELATIVE_PATH "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig" "${CMAKE_INSTALL_PREFIX}")
+string(REGEX REPLACE "/$" "" PACKAGE_RELATIVE_PATH "${PACKAGE_RELATIVE_PATH}")
+
+set(prefix "\${pcfiledir}/${PACKAGE_RELATIVE_PATH}")
+set(exec_prefix "\${prefix}")
+set(libdir "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+set(includedir "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+configure_file(libxml-2.0.pc.in libxml-2.0.pc @ONLY)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libxml-2.0.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig 
COMPONENT development)
+
+set(prefix "\$(cd \"\$(dirname \"\$0\")\"; pwd -P)/..")
+configure_file(xml2-config.in xml2-config @ONLY)
+install(PROGRAMS ${CMAKE_CURRENT_BINARY_DIR}/xml2-config DESTINATION ${CMAKE_INSTALL_BINDIR} COMPONENT 
development)
+
+set(XML_INCLUDEDIR "-I${CMAKE_INSTALL_FULL_INCLUDEDIR}/libxml2")
+set(XML_LIBDIR "-L${CMAKE_INSTALL_FULL_LIBDIR}")
+configure_file(xml2Conf.sh.in xml2Conf.sh @ONLY)
+install(FILES ${CMAKE_CURRENT_BINARY_DIR}/xml2Conf.sh DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT 
development)
+
 set(CPACK_COMPONENT_DEVELOPMENT_DEPENDS runtime)
 set(CPACK_COMPONENT_PROGRAMS_DEPENDS runtime)
 set(CPACK_DEB_COMPONENT_INSTALL ON)