From 54d34416617c63a6181bf51b816cc656783a23d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?R=C3=A9mi=20H=C3=A9rilier?= <rherilier@yahoo.fr>
Date: Thu, 19 Sep 2024 20:16:18 +0200
Subject: [PATCH] Add generation of registry file for pkg-config

---
 .pkg-config/taocpp-json.pc.in |  7 +++++++
 CMakeLists.txt                | 14 +++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 .pkg-config/taocpp-json.pc.in

diff --git a/.pkg-config/taocpp-json.pc.in b/.pkg-config/taocpp-json.pc.in
new file mode 100644
index 00000000..7a7cdf82
--- /dev/null
+++ b/.pkg-config/taocpp-json.pc.in
@@ -0,0 +1,7 @@
+includedir="@CMAKE_INSTALL_FULL_INCLUDEDIR@"
+
+Name: @PROJECT_NAME@
+Description: taoJSON is a C++ header-only JSON library
+Version: @PROJECT_VERSION@
+URL: https://github.com/taocpp/json
+Cflags: -I${includedir}
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65e2dcfe..0a753591 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,7 @@ include(GNUInstallDirs)
 
 set(TAOCPP_JSON_INSTALL_DOC_DIR "${CMAKE_INSTALL_DOCDIR}/tao/json" CACHE STRING "The installation doc directory")
 set(TAOCPP_JSON_INSTALL_CMAKE_DIR "${CMAKE_INSTALL_DATAROOTDIR}/${PROJECT_NAME}/cmake" CACHE STRING "The installation cmake directory")
+set(TAOCPP_JSON_INSTALL_PKGCONFIG_DIR "${CMAKE_INSTALL_DATAROOTDIR}/pkgconfig" CACHE STRING "The installation pkgconfig directory")
 
 # define a header-only library
 add_library(taocpp-json INTERFACE)
@@ -61,13 +62,20 @@ option(TAOCPP_JSON_INSTALL "Generate the install target" ${TAOCPP_JSON_IS_MAIN_P
 if(TAOCPP_JSON_INSTALL)
   include(CMakePackageConfigHelpers)
 
-  # Make package findable
+  # Make package findable by CMake
   configure_package_config_file(.cmake/taocpp-json-config.cmake.in ${PROJECT_NAME}-config.cmake
     INSTALL_DESTINATION ${TAOCPP_JSON_INSTALL_CMAKE_DIR}
     NO_CHECK_REQUIRED_COMPONENTS_MACRO
     NO_SET_AND_CHECK_MACRO
   )
 
+  # Make package findable by pkg-config
+  configure_package_config_file(.pkg-config/taocpp-json.pc.in ${PROJECT_NAME}.pc
+    INSTALL_DESTINATION ${TAOCPP_JSON_INSTALL_PKGCONFIG_DIR}
+    NO_CHECK_REQUIRED_COMPONENTS_MACRO
+    NO_SET_AND_CHECK_MACRO
+  )
+
   # Ignore pointer width differences since this is a header-only library
   unset(CMAKE_SIZEOF_VOID_P)
 
@@ -84,6 +92,10 @@ if(TAOCPP_JSON_INSTALL)
     ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake
     DESTINATION ${TAOCPP_JSON_INSTALL_CMAKE_DIR}
   )
+  install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc
+    DESTINATION ${TAOCPP_JSON_INSTALL_PKGCONFIG_DIR}
+  )
   install(EXPORT ${PROJECT_NAME}-targets
     NAMESPACE taocpp::
     DESTINATION ${TAOCPP_JSON_INSTALL_CMAKE_DIR}