Move wireshark.pc.in and make our .pc file paths relative

Move the libwireshark pkgconfig file to the resource directory.

Set the various paths in our .pc files based on the `pcfiledir` variable
instead of using absolute paths. This should make it possible to install
using a DESTDIR that differs from CMAKE_INSTALL_PREFIX.

CMakeLists.txt

@@ -1834,12 +1834,6 @@ configure_file(${CMAKE_SOURCE_DIR}/cmakeconfig.h.in ${CMAKE_BINARY_DIR}/config.h
 
 configure_file(${CMAKE_SOURCE_DIR}/ws_version.h.in ${CMAKE_BINARY_DIR}/ws_version.h)
 
-set( prefix "${CMAKE_INSTALL_PREFIX}" )
-set( exec_prefix "\${prefix}" )
-set( libdir "\${exec_prefix}/${CMAKE_INSTALL_LIBDIR}" )
-set( includedir  "\${prefix}/include" )
-set( plugindir "\${libdir}/wireshark/${PLUGIN_VERSION_DIR}" )
-
 # Doxygen variables
 file(GLOB TOP_LEVEL_SOURCE_LIST *.c *.cpp *.h)
 string (REPLACE ";" " " DOXYGEN_TOP_LEVEL_SOURCES "${TOP_LEVEL_SOURCE_LIST}")
@@ -1848,7 +1842,6 @@ set(DOXYGEN_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 
 set(CFG_OUT_FILES
 	doxygen.cfg
-	epan/wireshark.pc
 	packaging/macosx/osx-app.sh
 	packaging/macosx/osx-dmg.sh
 	packaging/macosx/wireshark-app.dmgbuild
@@ -1860,6 +1853,7 @@ set(CFG_OUT_FILES
 	resources/libwiretap.rc
 	resources/libwsutil.rc
 	resources/wireshark.exe.manifest
+	resources/wireshark.pc
 	resources/wireshark.rc
 )
 
@@ -4069,6 +4063,12 @@ if(BUILD_logray AND QT_FOUND AND NOT APPLE AND (NOT WIN32 OR USE_MSYSTEM))
 		RENAME org.wireshark.Logray.svg)
 endif()
 
+install(FILES "${CMAKE_BINARY_DIR}/resources/wireshark.pc"
+	DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+	COMPONENT "Development"
+	EXCLUDE_FROM_ALL
+)
+
 install(
 	DIRECTORY
 		${INSTALL_DIRS}

epan/CMakeLists.txt

@@ -397,12 +397,6 @@ install(FILES ${LIBWIRESHARK_PUBLIC_HEADERS}
 	EXCLUDE_FROM_ALL
 )
 
-install(FILES "${CMAKE_CURRENT_BINARY_DIR}/wireshark.pc"
-	DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
-	COMPONENT "Development"
-	EXCLUDE_FROM_ALL
-)
-
 add_executable(exntest EXCLUDE_FROM_ALL exntest.c except.c)
 target_link_libraries(exntest epan)
 set_target_properties(exntest PROPERTIES

resources/wireshark.pc.in

@@ -1,9 +1,9 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@
+prefix=${pcfiledir}/../..
+exec_prefix=${prefix}
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 sharedlibdir=${libdir}
-plugindir=@plugindir@
+plugindir=${libdir}/wireshark/@PLUGIN_VERSION_DIR@
 
 Name: Wireshark
 Description: Network Packet Dissection Library