date: cleanup

replace the pkgconfig hack with a proper patch

recipes-extended/date/date_git.bb

@@ -7,7 +7,7 @@ LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=b5d973344b3c7bbf7535f0e6e002d017"
 
 SRC_URI = " \
 	git://github.com/HowardHinnant/date.git;protocol=https;branch=master \
-	file://date.pc \	
+	file://pkgconfig.patch \
 "
 
 S = "${WORKDIR}/git"
@@ -23,10 +23,4 @@ EXTRA_OECMAKE += " \
 	-DBUILD_SHARED_LIBS=ON \
 	-DUSE_SYSTEM_TZ_DB=ON \
 "
-
-do_install:append() {
-	# source lacks pkgconfig support. Include a pc file, so 'date' can be found using pkgconfig
-	install -d ${D}${libdir}/pkgconfig
-	install -m 0644 ${WORKDIR}/date.pc ${D}${libdir}/pkgconfig
-}
 	

recipes-extended/date/files/date.pc

@@ -1,10 +0,0 @@
-prefix=/usr
-exec_prefix=/usr
-libdir=/usr/lib
-includedir=/usr/include
-
-Name: date
-Description: date library
-Version: 3.0.0
-Cflags: -I${includedir}/date
-Libs: -L${libdir} -ldate-tz -lpthread

recipes-extended/date/files/pkgconfig.patch

@@ -0,0 +1,61 @@
+From e56b2dce7e89a92e1b9b35caa13b3e938c4cedea Mon Sep 17 00:00:00 2001
+From: Cole Mickens <cole.mickens@gmail.com>
+Date: Sun, 26 Jan 2020 01:27:08 -0800
+Subject: [PATCH] CMakeLists.txt: output date.pc for pkg-config
+
+---
+ CMakeLists.txt | 15 +++++++++++++++
+ date.pc.in     | 10 ++++++++++
+ 2 files changed, 25 insertions(+)
+ create mode 100644 date.pc.in
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index f30c473..fe778e8 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -128,6 +128,15 @@ if( BUILD_TZ_LIB )
+     endif( )
+ endif( )
+ 
++if ( BUILD_TZ_LIB )
++  # Cflags: -I${includedir} @TZ_COMPILE_DEFINITIONS@
++  set( TZ_COMPILE_DEFINITIONS "$<IF:$<TARGET_EXISTS:date-tz>,-D$<JOIN:$<TARGET_PROPERTY:date-tz,INTERFACE_COMPILE_DEFINITIONS>, -D>,>" )
++  configure_file(date.pc.in date.pc.cf @ONLY)
++  file( GENERATE OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/date.pc"
++    INPUT "${CMAKE_CURRENT_BINARY_DIR}/date.pc.cf" )
++
++endif( )
++
+ #[===================================================================[
+    installation
+ #]===================================================================]
+@@ -171,6 +180,12 @@ install (
+   FILES cmake/dateConfig.cmake "${version_config}"
+   DESTINATION ${CONFIG_LOC})
+ 
++if ( BUILD_TZ_LIB )
++  install(
++    FILES ${CMAKE_BINARY_DIR}/date.pc
++    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
++endif( )
++
+ #[===================================================================[
+    testing
+ #]===================================================================]
+diff --git a/date.pc.in b/date.pc.in
+new file mode 100644
+index 0000000..b9c4623
+--- /dev/null
++++ b/date.pc.in
+@@ -0,0 +1,10 @@
++prefix=@CMAKE_INSTALL_PREFIX@
++exec_prefix=@CMAKE_INSTALL_BINDIR@
++libdir=@CMAKE_INSTALL_LIB@
++includedir=@CMAKE_INSTALL_INCLUDE@
++
++Name: date
++Description: A date and time library based on the C++11/14/17 <chrono> header
++Version: @PACKAGE_VERSION@
++Libs: -L${libdir} -ldate-tz
++Cflags: -I${includedir} @TZ_COMPILE_DEFINITIONS@
+