From 9d4f70cfe99626f82f9c8dcbf45f07709e3511b2 Mon Sep 17 00:00:00 2001
From: Thomas Bracht Laumann Jespersen <t@laumann.xyz>
Date: Fri, 15 Jul 2022 06:19:53 +0200
Subject: [PATCH] Handle CMAKE_INSTALL_xxx being absolute paths for .pc file
 generation

In some cases the CMAKE_INSTAL_{BIN,MAN,DOC,LIB,INCLUDE}DIR variables
may turn out to be absolute paths in which case prepending ${prefix} in
the pkg-config .pc files will result in incorrect values.

For .pc file generation, figure out if these variables are absolute and
omit the prefix in the configured file when so.

See: https://github.com/OSGeo/PROJ/commit/ab25e4b7ed9544e668282dcd293cfaaa2e56dbdf
---
 CMakeLists.txt                           | 15 ++++++++++++++-
 src/lib/openjp2/libopenjp2.pc.cmake.in   | 10 +++++-----
 src/lib/openjpip/libopenjpip.pc.cmake.in | 10 +++++-----
 3 files changed, 24 insertions(+), 11 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 05da91e7..fcf4709d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -327,7 +327,20 @@ else()
   option(BUILD_PKGCONFIG_FILES "Build and install pkg-config files" OFF)
 endif()
 if(BUILD_PKGCONFIG_FILES)
-# install in lib and not share (CMAKE_INSTALL_LIBDIR takes care of it for multi-arch)
+  macro(set_variable_from_rel_or_absolute_path var root rel_or_abs_path)
+    if(IS_ABSOLUTE "${rel_or_abs_path}")
+      set(${var} "${rel_or_abs_path}")
+    else()
+      set(${var} "${root}/${rel_or_abs_path}")
+    endif()
+  endmacro()
+  set_variable_from_rel_or_absolute_path("bindir" "\\\${prefix}" "${CMAKE_INSTALL_BINDIR}")
+  set_variable_from_rel_or_absolute_path("mandir" "\\\${prefix}" "${CMAKE_INSTALL_MANDIR}")
+  set_variable_from_rel_or_absolute_path("docdir" "\\\${prefix}" "${CMAKE_INSTALL_DOCDIR}")
+  set_variable_from_rel_or_absolute_path("libdir" "\\\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
+  set_variable_from_rel_or_absolute_path("includedir" "\\\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}/${OPENJPEG_INSTALL_SUBDIR}")
+
+  # install in lib and not share (CMAKE_INSTALL_LIBDIR takes care of it for multi-arch)
   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/src/lib/openjp2/libopenjp2.pc.cmake.in
     ${CMAKE_CURRENT_BINARY_DIR}/libopenjp2.pc @ONLY)
   install( FILES  ${CMAKE_CURRENT_BINARY_DIR}/libopenjp2.pc DESTINATION
diff --git a/src/lib/openjp2/libopenjp2.pc.cmake.in b/src/lib/openjp2/libopenjp2.pc.cmake.in
index c90be433..2ade312b 100644
--- a/src/lib/openjp2/libopenjp2.pc.cmake.in
+++ b/src/lib/openjp2/libopenjp2.pc.cmake.in
@@ -1,9 +1,9 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-bindir=${prefix}/@CMAKE_INSTALL_BINDIR@
-mandir=${prefix}/@CMAKE_INSTALL_MANDIR@
-docdir=${prefix}/@CMAKE_INSTALL_DOCDIR@
-libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/@OPENJPEG_INSTALL_SUBDIR@
+bindir=@bindir@
+mandir=@mandir@
+docdir=@docdir@
+libdir=@libdir@
+includedir=@includedir@
 
 Name: openjp2
 Description: JPEG2000 library (Part 1 and 2)
diff --git a/src/lib/openjpip/libopenjpip.pc.cmake.in b/src/lib/openjpip/libopenjpip.pc.cmake.in
index 8bc809d4..fc97ef04 100644
--- a/src/lib/openjpip/libopenjpip.pc.cmake.in
+++ b/src/lib/openjpip/libopenjpip.pc.cmake.in
@@ -1,9 +1,9 @@
 prefix=@CMAKE_INSTALL_PREFIX@
-bindir=${prefix}/@CMAKE_INSTALL_BINDIR@
-mandir=${prefix}/@CMAKE_INSTALL_MANDIR@
-docdir=${prefix}/@CMAKE_INSTALL_DOCDIR@
-libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
-includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@/@OPENJPEG_INSTALL_SUBDIR@
+bindir=@bindir@
+mandir=@mandir@
+docdir=@docdir@
+libdir=@libdir@
+includedir=@includedir@
 
 Name: openjpip
 Description: JPEG2000 Interactivity tools, APIs and protocols (Part 9)