depends: Remove ccache

.travis.yml

@@ -3,6 +3,7 @@ dist: trusty
 os: linux
 language: minimal
 cache:
+  ccache: true
   directories:
   - depends/built
   - depends/sdk-sources
@@ -68,7 +69,7 @@ script:
     - if [ -n "$USE_SHELL" ]; then export CONFIG_SHELL="$USE_SHELL"; fi
     - OUTDIR=$BASE_OUTDIR/$TRAVIS_PULL_REQUEST/$TRAVIS_JOB_NUMBER-$HOST
     - BITCOIN_CONFIG_ALL="--disable-dependency-tracking --prefix=$TRAVIS_BUILD_DIR/depends/$HOST --bindir=$OUTDIR/bin --libdir=$OUTDIR/lib"
-    - if [ -z "$NO_DEPENDS" ]; then depends/$HOST/native/bin/ccache --max-size=$CCACHE_SIZE; fi
+    - if [ -z "$NO_DEPENDS" ]; then ccache --max-size=$CCACHE_SIZE; fi
     - test -n "$USE_SHELL" && eval '"$USE_SHELL" -c "./autogen.sh"' || ./autogen.sh
     - mkdir build && cd build
     - ../configure --cache-file=config.cache $BITCOIN_CONFIG_ALL $BITCOIN_CONFIG || ( cat config.log && false)

depends/config.site.in

@@ -64,7 +64,6 @@ LDFLAGS="-L$depends_prefix/lib $LDFLAGS"
 CC="@CC@"
 CXX="@CXX@"
 OBJC="${CC}"
-CCACHE=$depends_prefix/native/bin/ccache
 PYTHONPATH=$depends_prefix/native/lib/python/dist-packages:$PYTHONPATH
 
 if test -n "@AR@"; then

depends/packages/packages.mk

@@ -1,5 +1,4 @@
 packages:=boost openssl libevent zeromq
-native_packages := native_ccache
 
 qt_native_packages = native_protobuf
 qt_packages = qrencode protobuf zlib

doc/dependencies.md

@@ -7,7 +7,6 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | --- | --- | --- | --- | --- | --- |
 | Berkeley DB | [4.8.30](http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html) | 4.8.x | No |  |  |
 | Boost | [1.64.0](http://www.boost.org/users/download/) | [1.47.0](https://github.com/bitcoin/bitcoin/pull/8920) | No |  |  |
-| ccache | [3.3.6](https://ccache.samba.org/download.html) |  | No |  |  |
 | Clang |  | [3.3+](http://llvm.org/releases/download.html) (C++11 support) |  |  |  |
 | D-Bus | [1.10.18](https://cgit.freedesktop.org/dbus/dbus/tree/NEWS?h=dbus-1.10) |  | No | Yes |  |
 | Expat | [2.2.5](https://libexpat.github.io/) |  | No | Yes |  |