62 lines
2.4 KiB
Makefile
62 lines
2.4 KiB
Makefile
#
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# Copyright (C) 2015 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# We no longer provide a ccache prebuilt.
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#
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# Ours was old, and had a number of issues that triggered non-reproducible
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# results and other failures. Newer ccache versions may fix some of those
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# issues, but at the large scale of our build servers, we weren't seeing
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# significant performance gains from using ccache -- you end up needing very
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# good locality and/or very large caches if you're building many different
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# configurations.
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#
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# Local no-change full rebuilds were showing better results, but why not just
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# use incremental builds at that point?
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#
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# So if you still want to use ccache, continue setting USE_CCACHE, but also set
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# the CCACHE_EXEC environment variable to the path to your ccache executable.
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ifneq ($(CCACHE_EXEC),)
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ifneq ($(filter-out false,$(USE_CCACHE)),)
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# The default check uses size and modification time, causing false misses
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# since the mtime depends when the repo was checked out
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export CCACHE_COMPILERCHECK ?= content
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# See man page, optimizations to get more cache hits
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# implies that __DATE__ and __TIME__ are not critical for functionality.
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# Ignore include file modification time since it will depend on when
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# the repo was checked out
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export CCACHE_SLOPPINESS := time_macros,include_file_mtime,file_macro
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# Turn all preprocessor absolute paths into relative paths.
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# Fixes absolute paths in preprocessed source due to use of -g.
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# We don't really use system headers much so the rootdir is
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# fine; ensures these paths are relative for all Android trees
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# on a workstation.
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export CCACHE_BASEDIR := /
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# Workaround for ccache with clang.
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# See http://petereisentraut.blogspot.com/2011/09/ccache-and-clang-part-2.html
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export CCACHE_CPP2 := true
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ifndef CC_WRAPPER
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CC_WRAPPER := $(CCACHE_EXEC)
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endif
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ifndef CXX_WRAPPER
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CXX_WRAPPER := $(CCACHE_EXEC)
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endif
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endif
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endif
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