From 520eaa5a525adce0cdbdc7b8c7f7d8f0375340a6 Mon Sep 17 00:00:00 2001
From: Juan Ramos <juan@lunarg.com>
Date: Sat, 7 Oct 2023 13:45:18 -0600
Subject: [PATCH] cmake: Fix vulkan.pc regressions

closes #1318, #1319
---
 loader/CMakeLists.txt | 4 ++++
 loader/vulkan.pc.in   | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/loader/CMakeLists.txt b/loader/CMakeLists.txt
index 4cb1147..c6366ee 100644
--- a/loader/CMakeLists.txt
+++ b/loader/CMakeLists.txt
@@ -448,10 +448,14 @@ if (PKG_CONFIG_FOUND)
 
     # BUG: The following code will NOT work well with `cmake --install ... --prefix <dir>`
     # due to this code relying on CMAKE_INSTALL_PREFIX being defined at configure time.
+    #
+    # NOTE: vulkan.pc essentially cover both Vulkan-Loader and Vulkan-Headers for legacy reasons.
     if ("${CMAKE_INSTALL_PREFIX}" STREQUAL "")
         set(CMAKE_INSTALL_LIBDIR_PC ${CMAKE_INSTALL_FULL_LIBDIR})
+        set(CMAKE_INSTALL_INCLUDEDIR_PC ${CMAKE_INSTALL_FULL_INCLUDEDIR})
     else()
         file(RELATIVE_PATH CMAKE_INSTALL_LIBDIR_PC ${CMAKE_INSTALL_PREFIX} ${CMAKE_INSTALL_FULL_LIBDIR})
+        file(RELATIVE_PATH CMAKE_INSTALL_INCLUDEDIR_PC ${CMAKE_INSTALL_PREFIX} ${CMAKE_INSTALL_FULL_INCLUDEDIR})
     endif()
     configure_file("vulkan.pc.in" "vulkan.pc" @ONLY)
     install(FILES "${CMAKE_CURRENT_BINARY_DIR}/vulkan.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
diff --git a/loader/vulkan.pc.in b/loader/vulkan.pc.in
index 16b0ded..6a285f2 100644
--- a/loader/vulkan.pc.in
+++ b/loader/vulkan.pc.in
@@ -1,4 +1,10 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/@CMAKE_INSTALL_LIBDIR_PC@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR_PC@
+
 Name: Vulkan-Loader
 Description: Vulkan Loader
 Version: @VULKAN_LOADER_VERSION@
-Libs: -L@CMAKE_INSTALL_LIBDIR_PC@ -lvulkan@VULKAN_LIB_SUFFIX@
+Libs: -L${libdir} -lvulkan@VULKAN_LIB_SUFFIX@
+Cflags: -I${includedir}
-- 
2.7.4