Split [CC|CXX]_WRAPPER from [TARGET|HOST]_[CC|CXX]

- Don't overwrite [TARGET|HOST]_[CC|CXX] with the [CC|CXX]_WRAPPER prefix,
  so that we can disable the wrapper per module.
- Disable ccache on a module when FDO is enabled.

Bug: 22612634
Change-Id: Ibc04a4742d589955066c7eceb43a0da9a2b893bc

1 files changed, 57 insertions, 0 deletions

diff --git a/core/ccache.mk b/core/ccache.mk
new file mode 100644
index 0000000..34e5e1c
--- /dev/null
+++ b/core/ccache.mk
@@ -0,0 +1,57 @@
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+ifneq ($(USE_CCACHE),)
+  # The default check uses size and modification time, causing false misses
+  # since the mtime depends when the repo was checked out
+  export CCACHE_COMPILERCHECK := content
+
+  # See man page, optimizations to get more cache hits
+  # implies that __DATE__ and __TIME__ are not critical for functionality.
+  # Ignore include file modification time since it will depend on when
+  # the repo was checked out
+  export CCACHE_SLOPPINESS := time_macros,include_file_mtime,file_macro
+
+  # Turn all preprocessor absolute paths into relative paths.
+  # Fixes absolute paths in preprocessed source due to use of -g.
+  # We don't really use system headers much so the rootdir is
+  # fine; ensures these paths are relative for all Android trees
+  # on a workstation.
+  export CCACHE_BASEDIR := /
+
+  # Workaround for ccache with clang.
+  # See http://petereisentraut.blogspot.com/2011/09/ccache-and-clang-part-2.html
+  export CCACHE_CPP2 := true
+
+  CCACHE_HOST_TAG := $(HOST_PREBUILT_TAG)
+  # If we are cross-compiling Windows binaries on Linux
+  # then use the linux ccache binary instead.
+  ifeq ($(HOST_OS)-$(BUILD_OS),windows-linux)
+    CCACHE_HOST_TAG := linux-$(HOST_PREBUILT_ARCH)
+  endif
+  ccache := prebuilts/misc/$(CCACHE_HOST_TAG)/ccache/ccache
+  # Check that the executable is here.
+  ccache := $(strip $(wildcard $(ccache)))
+  ifdef ccache
+    ifndef CC_WRAPPER
+      CC_WRAPPER := $(ccache)
+    endif
+    ifndef CXX_WRAPPER
+      CXX_WRAPPER := $(ccache)
+    endif
+    ccache =
+  endif
+endif