From d9edfd4ac9289ac5af7e41c7a75482451723b4e0 Mon Sep 17 00:00:00 2001
From: Cristian Morales Vega <cristian@samknows.com>
Date: Fri, 6 Nov 2020 10:31:08 +0000
Subject: [PATCH] cmake: add RELOCATABLE_PKGCONFIG option

---
 CMakeLists.txt   | 11 +++++++++++
 CMakeOptions.txt |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3315d2fc..aeb87150 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -416,10 +416,21 @@ file(RELATIVE_PATH top_builddir "${CMAKE_CURRENT_BINARY_DIR}/dir" "${CMAKE_CURRE
 set(abs_top_srcdir  "${CMAKE_CURRENT_SOURCE_DIR}")
 set(abs_top_builddir "${CMAKE_CURRENT_BINARY_DIR}")
 # libnghttp2.pc (pkg-config file)
+if(RELOCATABLE_PKGCONFIG)
+file(RELATIVE_PATH PKGCONF_TO_PREFIX "${CMAKE_INSTALL_FULL_LIBDIR}/pkgconfig" "${CMAKE_INSTALL_PREFIX}")
+file(RELATIVE_PATH EXEC_PREFIX_TO_LIBDIR "${CMAKE_INSTALL_PREFIX}" "${CMAKE_INSTALL_FULL_LIBDIR}")
+file(RELATIVE_PATH PREFIX_TO_INCLUDEDIR "${CMAKE_INSTALL_PREFIX}" "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
+
+set(prefix          "\${pcfiledir}/${PKGCONF_TO_PREFIX}")
+set(exec_prefix     "\${prefix}")
+set(libdir          "\${exec_prefix}/${EXEC_PREFIX_TO_LIBDIR}")
+set(includedir      "\${prefix}/${PREFIX_TO_INCLUDEDIR}")
+else()
 set(prefix          "${CMAKE_INSTALL_PREFIX}")
 set(exec_prefix     "${CMAKE_INSTALL_PREFIX}")
 set(libdir          "${CMAKE_INSTALL_FULL_LIBDIR}")
 set(includedir      "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
+endif()
 set(VERSION         "${PACKAGE_VERSION}")
 # For init scripts and systemd service file (in contrib/)
 set(bindir          "${CMAKE_INSTALL_FULL_BINDIR}")
diff --git a/CMakeOptions.txt b/CMakeOptions.txt
index a8332bf0..b112ca1a 100644
--- a/CMakeOptions.txt
+++ b/CMakeOptions.txt
@@ -27,4 +27,6 @@ option(WITH_SPDYLAY     "Use spdylay"
 option(WITH_MRUBY       "Use mruby")
 option(WITH_NEVERBLEED  "Use neverbleed")
 
+option(RELOCATABLE_PKGCONFIG "Make the pkg-config files relocatable")
+
 # vim: ft=cmake: