From 9f005c60d6067d94279a3e3e81ec178bf4e2f227 Mon Sep 17 00:00:00 2001
From: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>
Date: Thu, 7 Sep 2023 20:47:57 +0100
Subject: [PATCH] cmake: Install `libsecp256k1.pc` file

This change allows downstream projects to use pkg-config to search for
the libsecp256k1 library that is built with CMake.
---
 cmake/GeneratePkgConfigFile.cmake |  8 ++++++++
 src/CMakeLists.txt                | 10 +++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 cmake/GeneratePkgConfigFile.cmake

diff --git a/cmake/GeneratePkgConfigFile.cmake b/cmake/GeneratePkgConfigFile.cmake
new file mode 100644
index 0000000000000..9c1d7f1ddd6b9
--- /dev/null
+++ b/cmake/GeneratePkgConfigFile.cmake
@@ -0,0 +1,8 @@
+function(generate_pkg_config_file in_file)
+  set(prefix ${CMAKE_INSTALL_PREFIX})
+  set(exec_prefix \${prefix})
+  set(libdir \${exec_prefix}/${CMAKE_INSTALL_LIBDIR})
+  set(includedir \${prefix}/${CMAKE_INSTALL_INCLUDEDIR})
+  set(PACKAGE_VERSION ${PROJECT_VERSION})
+  configure_file(${in_file} ${PROJECT_NAME}.pc @ONLY)
+endfunction()
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index b305751b08da7..4cbaeb914d42a 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -161,5 +161,13 @@ if(SECP256K1_INSTALL)
       ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake
       ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config-version.cmake
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
-)
+  )
+
+  include(GeneratePkgConfigFile)
+  generate_pkg_config_file(${PROJECT_SOURCE_DIR}/libsecp256k1.pc.in)
+  install(
+    FILES
+      ${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig
+  )
 endif()