From c5bfa0d4cc753af62276edbb3f5c79dcae744c8d Mon Sep 17 00:00:00 2001
From: Nicolas Mora <github@babelouest.org>
Date: Fri, 27 May 2022 10:42:33 -0400
Subject: [PATCH] Fix pkg-config file with absolute path for
 CMAKE_INSTALL_{INCLUDE,LIB}DIR  and CMAKE_MODULE_PATH who was used as single
 value

---
 CMakeLists.txt | 12 ++++++++++++
 libhoel.pc.in  |  4 ++--
 src/Makefile   |  4 ++--
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9369c13..f0cbef5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -332,6 +332,18 @@ endif ()
 
 option(INSTALL_HEADER "Install the header files" ON) # Install hoel.h or not
 
+if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+  set(PKGCONFIG_TARGET_INCLUDES "${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+  set(PKGCONFIG_TARGET_INCLUDES "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+endif()
+
+if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+  set(PKGCONFIG_TARGET_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+else()
+  set(PKGCONFIG_TARGET_LIBDIR "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+endif()
+
 configure_file(libhoel.pc.in libhoel.pc @ONLY)
 
 install(FILES ${CMAKE_CURRENT_BINARY_DIR}/libhoel.pc
diff --git a/libhoel.pc.in b/libhoel.pc.in
index 116cbf5..2289437 100644
--- a/libhoel.pc.in
+++ b/libhoel.pc.in
@@ -1,7 +1,7 @@
 prefix=@CMAKE_INSTALL_PREFIX@
 exec_prefix=@CMAKE_INSTALL_PREFIX@
-libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+libdir=@PKGCONFIG_TARGET_LIBDIR@
+includedir=@PKGCONFIG_TARGET_INCLUDES@
 
 Name: @PROJECT_NAME@
 Description: @PROJECT_DESCRIPTION@
diff --git a/src/Makefile b/src/Makefile
index 703f928..b229288 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -98,8 +98,8 @@ $(PKGCONFIG_FILE):
 	@cp $(PKGCONFIG_TEMPLATE) $(PKGCONFIG_FILE)
 	@echo Pkgconfig file $(PKGCONFIG_FILE) generated
 	@sed -i -e 's#@CMAKE_INSTALL_PREFIX@#$(DESTDIR)#g' $(PKGCONFIG_FILE)
-	@sed -i -e 's/@CMAKE_INSTALL_LIBDIR@/lib/g' $(PKGCONFIG_FILE)
-	@sed -i -e 's/@CMAKE_INSTALL_INCLUDEDIR@/include/g' $(PKGCONFIG_FILE)
+	@sed -i -e 's#@PKGCONFIG_TARGET_LIBDIR@#$${prefix}/lib#g' $(PKGCONFIG_FILE)
+	@sed -i -e 's#@PKGCONFIG_TARGET_INCLUDES@#$${prefix}/include#g' $(PKGCONFIG_FILE)
 	@sed -i -e 's/@PROJECT_NAME@/$(PROJECT_NAME)/g' $(PKGCONFIG_FILE)
 	@sed -i -e 's/@PROJECT_DESCRIPTION@/$(PROJECT_DESCRIPTION)/g' $(PKGCONFIG_FILE)
 	@sed -i -e 's|@PROJECT_BUGREPORT_PATH@|$(PROJECT_BUGREPORT_PATH)|g' $(PKGCONFIG_FILE)