From d3e77ccb593b940134aabb52c4b160f8efb6159d Mon Sep 17 00:00:00 2001
From: mj-xmr <mjxmr@protonmail.com>
Date: Wed, 15 Apr 2020 20:38:23 +0200
Subject: [PATCH] FindCcache automatically

---
 CMakeLists.txt         |  2 ++
 cmake/FindCcache.cmake | 57 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 cmake/FindCcache.cmake

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 03ede0483..d9ec866e4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,8 @@ message(STATUS "CMake version ${CMAKE_VERSION}")
 
 project(monero)
 
+include(FindCcache) # Has to be included after the project() macro, to be able to read the CXX variable.
+
 enable_language(C ASM)
 
 function (die msg)
diff --git a/cmake/FindCcache.cmake b/cmake/FindCcache.cmake
new file mode 100644
index 000000000..fa357610b
--- /dev/null
+++ b/cmake/FindCcache.cmake
@@ -0,0 +1,57 @@
+# Copyright (c) 2014-2020, The Monero Project
+#
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without modification, are
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this list of
+#    conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice, this list
+#    of conditions and the following disclaimer in the documentation and/or other
+#    materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its contributors may be
+#    used to endorse or promote products derived from this software without specific
+#    prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+# THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# - Try to find readline include dirs and libraries 
+#
+# Automatically finds ccache build accelerator, if it's found in PATH.
+#
+# Usage of this module as follows:
+#
+#     project(monero)
+#     include(FindCcache) # Include AFTER the project() macro to be able to reach the CMAKE_CXX_COMPILER variable
+#
+# Properties modified by this module:
+#
+#  GLOBAL PROPERTY RULE_LAUNCH_COMPILE     set to ccache, when ccache found
+#  GLOBAL PROPERTY RULE_LAUNCH_LINK        set to ccache, when ccache found
+
+find_program(CCACHE_FOUND ccache)
+if (CCACHE_FOUND)
+	set(TEMP_CPP_FILE "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/test-program.cpp")
+	file(WRITE "${TEMP_CPP_FILE}" "int main() { return 0; }")
+	execute_process(COMMAND "${CCACHE_FOUND}" "${CMAKE_CXX_COMPILER}" "${TEMP_CPP_FILE}"  RESULT_VARIABLE RET)
+	if (${RET} EQUAL 0)
+		message("found usable ccache: ${CCACHE_FOUND}")
+		set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE "${CCACHE_FOUND}")
+		set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK    "${CCACHE_FOUND}")
+	else()
+		message("found ccache ${CCACHE_FOUND}, but is UNUSABLE! Return code: ${RET}")
+	endif()	    	
+else()
+	message("ccache NOT found!")
+endif()
+