From 244948e174c0b698ac492d5aa8e379d5ccbc1323 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Camilla=20L=C3=B6wy?= <elmindreda@elmindreda.org>
Date: Fri, 30 Jul 2021 13:19:46 +0200
Subject: [PATCH] Export pkg-config dependencies via the CMake cache

This will be useful when building GLFW as a CMake object library and
linking it into a larger library that exports pkg-config information.

Partly based on #1307 by @a3f.

Closes #1307.
---
 CMake/glfw3.pc.in | 4 ++--
 CMakeLists.txt    | 9 +++++++--
 README.md         | 3 +++
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/CMake/glfw3.pc.in b/CMake/glfw3.pc.in
index f74298d4..37f4efd9 100644
--- a/CMake/glfw3.pc.in
+++ b/CMake/glfw3.pc.in
@@ -7,7 +7,7 @@ Name: GLFW
 Description: A multi-platform library for OpenGL, window and input
 Version: @GLFW_VERSION@
 URL: https://www.glfw.org/
-Requires.private: @GLFW_PKG_DEPS@
+Requires.private: @GLFW_PKG_CONFIG_REQUIRES_PRIVATE@
 Libs: -L${libdir} -l@GLFW_LIB_NAME@
-Libs.private: @GLFW_PKG_LIBS@
+Libs.private: @GLFW_PKG_CONFIG_LIBS_PRIVATE@
 Cflags: -I${includedir}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index ab3248ee..2519b071 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -258,12 +258,17 @@ endif()
 # Export GLFW library dependencies
 #--------------------------------------------------------------------
 foreach(arg ${glfw_PKG_DEPS})
-    set(GLFW_PKG_DEPS "${GLFW_PKG_DEPS} ${arg}")
+    set(deps "${deps} ${arg}")
 endforeach()
 foreach(arg ${glfw_PKG_LIBS})
-    set(GLFW_PKG_LIBS "${GLFW_PKG_LIBS} ${arg}")
+    set(libs "${libs} ${arg}")
 endforeach()
 
+set(GLFW_PKG_CONFIG_REQUIRES_PRIVATE "${deps}" CACHE INTERNAL
+    "GLFW pkg-config Requires.private")
+set(GLFW_PKG_CONFIG_LIBS_PRIVATE "${libs}" CACHE INTERNAL
+    "GLFW pkg-config Libs.private")
+
 #--------------------------------------------------------------------
 # Create generated files
 #--------------------------------------------------------------------
diff --git a/README.md b/README.md
index 98b49733..4667347c 100644
--- a/README.md
+++ b/README.md
@@ -131,6 +131,8 @@ information on what to include when reporting a bug.
    surface extension (#1793)
  - Added `GLFW_LIBRARY_TYPE` CMake variable for overriding the library type
    (#279,#1307,#1497,#1574,#1928)
+ - Added `GLFW_PKG_CONFIG_REQUIRES_PRIVATE` and `GLFW_PKG_CONFIG_LIBS_PRIVATE` CMake
+   variables exposing pkg-config dependencies (#1307)
  - Made joystick subsystem initialize at first use (#1284,#1646)
  - Made `GLFW_DOUBLEBUFFER` a read-only window attribute
  - Updated the minimum required CMake version to 3.1
@@ -322,6 +324,7 @@ skills.
  - Fredrik Ehnbom
  - Robin Eklind
  - Siavash Eliasi
+ - Ahmad Fatoum
  - Felipe Ferreira
  - Michael Fogleman
  - Gerald Franz