From 27e4695ae6aa8da7bed66cdb7c80d9461fd1d4fe Mon Sep 17 00:00:00 2001
From: otegami <a.s.takuya1026@gmail.com>
Date: Wed, 24 Apr 2024 23:30:23 +0800
Subject: [PATCH] Add support for absolute CMAKE_INSTALL_*DIR

---
 CMakeLists.txt  | 14 ++++++++++----
 msgpack-c.pc.in |  7 +++----
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 14b6d2219..6a586aec0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -28,10 +28,16 @@ SET (VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_REVISION})
 
 LIST (APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/")
 include(GNUInstallDirs)
-SET (prefix ${CMAKE_INSTALL_PREFIX})
-SET (exec_prefix ${CMAKE_INSTALL_PREFIX})
-SET (libdir ${CMAKE_INSTALL_LIBDIR})
-SET (includedir ${CMAKE_INSTALL_INCLUDEDIR})
+if(IS_ABSOLUTE "${CMAKE_INSTALL_LIBDIR}")
+  set(MSGPACK_PKG_CONFIG_LIBDIR "${CMAKE_INSTALL_LIBDIR}")
+else()
+  set(MSGPACK_PKG_CONFIG_LIBDIR "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
+endif()
+if(IS_ABSOLUTE "${CMAKE_INSTALL_INCLUDEDIR}")
+  set(MSGPACK_PKG_CONFIG_INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+else()
+  set(MSGPACK_PKG_CONFIG_INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
+endif()
 
 OPTION (MSGPACK_32BIT "32bit compile" OFF)
 
diff --git a/msgpack-c.pc.in b/msgpack-c.pc.in
index 208066252..4aab02f55 100644
--- a/msgpack-c.pc.in
+++ b/msgpack-c.pc.in
@@ -1,7 +1,6 @@
-prefix=@prefix@
-exec_prefix=@exec_prefix@
-libdir=@libdir@
-includedir=@includedir@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@MSGPACK_PKG_CONFIG_INCLUDEDIR@
+libdir=@MSGPACK_PKG_CONFIG_INCLUDEDIR@
 
 Name: MessagePack
 Description: Binary-based efficient object serialization library