File _service:tar_git:output-date-pc-for-pkg-config.patch of Package date

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${includedir} @TZ_COMPILE_DEFINITIONS@
+  set( TZ_COMPILE_DEFINITIONS "-D$<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 ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+endif( )
+
 #[===================================================================[
    testing
 #]===================================================================]
diff --git a/date.pc.in b/date.pc.in
new file mode 100644
index 0000000..b9c4623
--- /dev/null
+++ b/date.pc.in
@@ -0,0 +1,10 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+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@