我使用预编译头和CCACHE来加速编译（GCC 5.3.1）
两个分开工作（我预先编译了x2加速，第二次运行时加速了CC25E x25），但是我很难让它们一起工作（我在查看CCACHE统计信息时只有缓存未命中）。
您是否看到ccache无法使用预编译标头的原因？
以下是CCACHE统计信息
cache directory /work1/heyho/cache/ccache
primary config /work1/heyho/cache/ccache/ccache.conf
secondary config (readonly) /etc/ccache.conf
cache hit (direct) 1
cache hit (preprocessed) 0
cache miss 1016
called for link 12
compile failed 1
files in cache 1490
cache size 627.1 MB
max cache size 5.0 GB
以下是CCACHE日志（第二次运行）的示例
[x] === CCACHE 3.2.1 STARTED =========================================
[x] Config: (default) base_dir =
[x] Config: (environment) cache_dir = /work1/gwen/cache/ccache
[x] Config: (default) cache_dir_levels = 2
[x] Config: (default) compiler =
[x] Config: (default) compiler_check = mtime
[x] Config: (default) compression = false
[x] Config: (default) compression_level = 6
[x] Config: (default) cpp_extension =
[x] Config: (default) direct_mode = true
[x] Config: (default) disable = false
[x] Config: (default) extra_files_to_hash =
[x] Config: (default) hard_link = false
[x] Config: (environment) hash_dir = true
[x] Config: (environment) log_file = /tmp/cache.debug
[x] Config: (default) max_files = 0
[x] Config: (/work1/gwen/cache/ccache/ccache.conf) max_size = 5.0G
[x] Config: (default) path =
[x] Config: (environment) prefix_command =
[x] Config: (default) read_only = false
[x] Config: (default) read_only_direct = false
[x] Config: (default) recache = false
[x] Config: (default) run_second_cpp = false
[x] Config: (/work1/gwen/cache/ccache/ccache.conf) sloppiness = time_macros
[x] Config: (default) stats = true
[x] Config: (default) temporary_dir =
[x] Config: (default) umask =
[x] Config: (default) unify = false
[x] Command line: ccache /usr/bin/c++ -DUSE_PRECOMPILED -Dbluevision_EXPORTS -fPIC -I/usr/local/include/opencv -I/usr/local/include -I/work-crypt/gwen/workspace/bluecime/bluevision/src -I/work-crypt/gwen/workspace/bluecime/bluevision/build/None_Linux-4.4.14-200.fc22.x86_64/src -std=c++11 -fPIC -Werror -Wall -march=corei7-avx -mavx -msse4.1 -msse4.2 -fabi-version=6 -mavx2 -Winvalid-pch -include precompiled_header.hpp -o CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o -c /work-crypt/gwen/workspace/bluecime/bluevision/src/descriptor/histogram/integral_image.cpp
[x] Hostname: kernavo.com
[x] Working directory: /work-crypt/gwen/workspace/bluecime/bluevision/build/None_Linux-4.4.14-200.fc22.x86_64/src
[x] Detected use of precompiled header: precompiled_header.hpp.gch
[x] Source file: /work-crypt/gwen/workspace/bluecime/bluevision/src/descriptor/histogram/integral_image.cpp
[x] Object file: CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o
[x] Trying direct lookup
[x] Looking for object file hash in /work1/gwen/cache/ccache/3/9/67544dd3c9bebe61712bf8bcc68c23-10829.manifest
[x] Did not find object file hash in manifest
[x] Running preprocessor
[x] Executing /usr/bin/c++ -fPIC -std=c++11 -fPIC -Werror -Wall -march=corei7-avx -mavx -msse4.1 -msse4.2 -fabi-version=6 -mavx2 -Winvalid-pch -DUSE_PRECOMPILED -Dbluevision_EXPORTS -I/usr/local/include/opencv -I/usr/local/include -I/work-crypt/gwen/workspace/bluecime/bluevision/src -I/work-crypt/gwen/workspace/bluecime/bluevision/build/None_Linux-4.4.14-200.fc22.x86_64/src -include precompiled_header.hpp -fpch-preprocess -E /work-crypt/gwen/workspace/bluecime/bluevision/src/descriptor/histogram/integral_image.cpp
[x] Got object file hash from preprocessor
[x] Object file /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o not in cache
[x] Running real compiler
[x] Executing /usr/bin/c++ -fPIC -std=c++11 -fPIC -Werror -Wall -march=corei7-avx -mavx -msse4.1 -msse4.2 -fabi-version=6 -mavx2 -Winvalid-pch -c -o CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o /work1/gwen/cache/ccache/tmp/integral_i.stdout.kernavo.com.27724.BLT8ks.ii
[x] Unlink /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o.tmp.stdout.kernavo.com.27724.x1URnV
[x] Unlink /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o.tmp.stderr.kernavo.com.27724.rxhBqo.2
[x] Unlink /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o.tmp.stderr.kernavo.com.27724.rxhBqo
[x] Copying CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o to /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o via /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o.kernavo.com.27724.vTjTiS (uncompressed)
[x] Stored in cache: CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o -> /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o
[x] Copying /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o to CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o via CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o.kernavo.com.27724.BJzcbm (uncompressed)
[x] Created from cache: /work1/gwen/cache/ccache/c/b/960271b46a4eb133ebec4407f8b799-193981.o -> CMakeFiles/bluevision.dir/descriptor/histogram/integral_image.cpp.o
[x] Added object file hash to /work1/gwen/cache/ccache/3/9/67544dd3c9bebe61712bf8bcc68c23-10829.manifest
[x] Unlink /work1/gwen/cache/ccache/tmp/integral_i.stdout.kernavo.com.27724.BLT8ks.ii
[x] Unlink /work1/gwen/cache/ccache/tmp/integral_i.stdout.kernavo.com.27724.BLT8ks
[x] Unlink /work1/gwen/cache/ccache/tmp/tmp.cpp_stderr.kernavo.com.27724.jae35Z
[x] Acquired lock /work1/gwen/cache/ccache/c/stats.lock
[x] Releasing lock /work1/gwen/cache/ccache/c/stats.lock
[x] Unlink /work1/gwen/cache/ccache/c/stats.lock
[x] Result: cache miss
[x] Unlink /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o.tmp.stdout.kernavo.com.27876.eFOVH2
[x] Unlink /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o.tmp.stderr.kernavo.com.27876.a4kQ4O.2
[x] Unlink /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o.tmp.stderr.kernavo.com.27876.a4kQ4O
[x] Copying CMakeFiles/bluevision.dir/descriptor/descriptor_spatio.cpp.o to /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o via /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o.kernavo.com.27876.sLSNVB (uncompressed)
[x] Stored in cache: CMakeFiles/bluevision.dir/descriptor/descriptor_spatio.cpp.o -> /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o
[x] Copying /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o to CMakeFiles/bluevision.dir/descriptor/descriptor_spatio.cpp.o via CMakeFiles/bluevision.dir/descriptor/descriptor_spatio.cpp.o.kernavo.com.27876.CBXLMo (uncompressed)
[x] Created from cache: /work1/gwen/cache/ccache/a/3/7ac45e9e75fedfd804f2aeb01e5ed0-126212.o -> CMakeFiles/bluevision.dir/descriptor/descriptor_spatio.cpp.o
[x] Added object file hash to /work1/gwen/cache/ccache/0/c/677d29d2a852e11bc8ea97fdc27fda-9012.manifest
[x] Unlink /work1/gwen/cache/ccache/tmp/descriptor.stdout.kernavo.com.27876.4mA1kg.ii
[x] Unlink /work1/gwen/cache/ccache/tmp/descriptor.stdout.kernavo.com.27876.4mA1kg
[x] Unlink /work1/gwen/cache/ccache/tmp/tmp.cpp_stderr.kernavo.com.27876.4r9fHu
[x] Acquired lock /work1/gwen/cache/ccache/a/stats.lock
[x] Releasing lock /work1/gwen/cache/ccache/a/stats.lock
[x] Unlink /work1/gwen/cache/ccache/a/stats.lock
[x] Result: cache miss