From d333f089588961a419dfcc97b10dcd89bba19cbc Mon Sep 17 00:00:00 2001
From: Dylan Baker <dylan@pnwbakers.com>
Date: Mon, 25 Nov 2024 23:39:11 -0800
Subject: [PATCH] CMake: generate a pkg-config file that follow pkg-config
 conventions (#4456)

* CMake: configure pkg-config with @only

And use @ replacement instead of {}, since ${} is significant in
pkg-config's format

* CMake: use conventional prefix and incluedir variables in pkg-config

This is more standard, and has some advantages when cross compiling.
This also means that the pkg-config files generated by Meson and CMake
now match.
---
 CMakeLists.txt         | 1 +
 cmake/pkg-config.pc.in | 9 ++++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index df61fc332..27440a5d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -149,6 +149,7 @@ endif()
 CONFIGURE_FILE(
     "${CMAKE_CURRENT_SOURCE_DIR}/cmake/pkg-config.pc.in"
     "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc"
+    @ONLY
 )
 
 ##
diff --git a/cmake/pkg-config.pc.in b/cmake/pkg-config.pc.in
index d36317f09..21a91a3cf 100644
--- a/cmake/pkg-config.pc.in
+++ b/cmake/pkg-config.pc.in
@@ -1,4 +1,7 @@
-Name: ${PROJECT_NAME}
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
+
+Name: @PROJECT_NAME@
 Description: JSON for Modern C++
-Version: ${PROJECT_VERSION}
-Cflags: -I${CMAKE_INSTALL_FULL_INCLUDEDIR}
+Version: @PROJECT_VERSION@
+Cflags: -I${includedir}