tf-psa-crypto: cmake: Add package config and install support

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

tf-psa-crypto/TF-PSA-Crypto.cmake

@@ -1,3 +1,4 @@
+include(CMakePackageConfigHelpers)
 include(GNUInstallDirs)
 
 # Determine if TF-PSA-Crypto is being built as a subproject using add_subdirectory()
@@ -40,7 +41,7 @@ else()
 endif()
 
 # Support for package config and install to be added later.
-option(DISABLE_PACKAGE_CONFIG_AND_INSTALL "Disable package configuration, target export and installation" ON)
+option(DISABLE_PACKAGE_CONFIG_AND_INSTALL "Disable package configuration, target export and installation" ${TF_PSA_CRYPTO_AS_SUBPROJECT})
 
 if (CMAKE_C_SIMULATE_ID)
     set(COMPILER_ID ${CMAKE_C_SIMULATE_ID})
@@ -281,6 +282,7 @@ endif()
 add_subdirectory(include)
 add_subdirectory(core)
 add_subdirectory(drivers)
+add_subdirectory(pkgconfig)
 
 #
 # The C files in tests/src directory contain test code shared among test suites
@@ -383,3 +385,39 @@ if(ENABLE_TESTING)
                     ${CMAKE_CURRENT_BINARY_DIR}/DartConfiguration.tcl COPYONLY)
     endif()
 endif()
+
+if(NOT DISABLE_PACKAGE_CONFIG_AND_INSTALL)
+    configure_package_config_file(
+        "cmake/TF-PSA-CryptoConfig.cmake.in"
+        "cmake/TF-PSA-CryptoConfig.cmake"
+            INSTALL_DESTINATION "cmake")
+
+    write_basic_package_version_file(
+        "cmake/TF-PSA-CryptoConfigVersion.cmake"
+            COMPATIBILITY SameMajorVersion
+            VERSION 0.1.0)
+
+    install(
+        FILES "${CMAKE_CURRENT_BINARY_DIR}/cmake/TF-PSA-CryptoConfig.cmake"
+              "${CMAKE_CURRENT_BINARY_DIR}/cmake/TF-PSA-CryptoConfigVersion.cmake"
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/TF-PSA-Crypto")
+
+    export(
+        EXPORT MbedTLSTargets
+        NAMESPACE TF-PSA-Crypto::
+        FILE "cmake/TF-PSA-CryptoTargets.cmake")
+
+    install(
+        EXPORT MbedTLSTargets
+        NAMESPACE TF-PSA-Crypto::
+        DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/TF-PSA-Crypto"
+        FILE "TF-PSA-CryptoTargets.cmake")
+
+    if(CMAKE_VERSION VERSION_GREATER 3.15 OR CMAKE_VERSION VERSION_EQUAL 3.15)
+        # Do not export the package by default
+        cmake_policy(SET CMP0090 NEW)
+
+        # Make this package visible to the system
+        export(PACKAGE TF-PSA-Crypto)
+    endif()
+endif()

tf-psa-crypto/cmake/.gitignore

@@ -0,0 +1 @@
+TF-PSA-CryptoConfig.cmake

tf-psa-crypto/cmake/TF-PSA-CryptoConfig.cmake.in

@@ -0,0 +1,3 @@
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/TF-PSA-CryptoTargets.cmake")

tf-psa-crypto/pkgconfig/.gitignore

@@ -0,0 +1,2 @@
+Makefile
+*.pc

tf-psa-crypto/pkgconfig/CMakeLists.txt

@@ -0,0 +1,15 @@
+if(NOT DISABLE_PACKAGE_CONFIG_AND_INSTALL)
+  include(JoinPaths.cmake)
+  join_paths(PKGCONFIG_INCLUDEDIR "\${prefix}" "${CMAKE_INSTALL_INCLUDEDIR}")
+  join_paths(PKGCONFIG_LIBDIR "\${prefix}" "${CMAKE_INSTALL_LIBDIR}")
+
+  #define these manually since minimum CMAKE version is not 3.9 for DESCRIPTION and 3.12 for HOMEPAGE_URL usage in project() below.
+  # Prefix with something that won't clash with newer versions of CMAKE.
+  set(PKGCONFIG_PROJECT_DESCRIPTION "TF-PSA-Crypto is a C library that implements cryptographic primitives. Its small code footprint makes it suitable for embedded systems.")
+  set(PKGCONFIG_PROJECT_HOMEPAGE_URL "https://www.trustedfirmware.org/projects/mbed-tls/")
+
+  configure_file(tfpsacrypto.pc.in tfpsacrypto.pc @ONLY)
+    install(FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/tfpsacrypto.pc
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)
+endif()

tf-psa-crypto/pkgconfig/JoinPaths.cmake

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+# This module provides function for joining paths
+# known from most languages
+#
+# Copyright The Mbed TLS Contributors
+#
+# This script originates from:
+#   - https://github.com/jtojnar/cmake-snips
+# Jan has provided re-licensing under Apache 2.0 and GPL 2.0+ and
+# allowed for the change of Copyright.
+#
+# Modelled after Python’s os.path.join
+# https://docs.python.org/3.7/library/os.path.html#os.path.join
+# Windows not supported
+function(join_paths joined_path first_path_segment)
+    set(temp_path "${first_path_segment}")
+    foreach(current_segment IN LISTS ARGN)
+        if(NOT ("${current_segment}" STREQUAL ""))
+            if(IS_ABSOLUTE "${current_segment}")
+                set(temp_path "${current_segment}")
+            else()
+                set(temp_path "${temp_path}/${current_segment}")
+            endif()
+        endif()
+    endforeach()
+    set(${joined_path} "${temp_path}" PARENT_SCOPE)
+endfunction()

tf-psa-crypto/pkgconfig/tfpsacrypto.pc.in

@@ -0,0 +1,10 @@
+prefix=@CMAKE_INSTALL_PREFIX@
+includedir=@PKGCONFIG_INCLUDEDIR@
+libdir=@PKGCONFIG_LIBDIR@
+
+Name: @PROJECT_NAME@
+Description: @PKGCONFIG_PROJECT_DESCRIPTION@
+URL: @PKGCONFIG_PROJECT_HOMEPAGE_URL@
+Version: @PROJECT_VERSION@
+Cflags: -I"${includedir}"
+Libs: -L"${libdir}" -lmbedcrypto -lbuiltin -leverest -lp256m