最近一直嘗試使用TensorFlow源碼進行編譯，在編譯過程中遇到一個Status 4的錯誤碼。 github問題鏈接
其完整錯誤日志如下：
ERROR: /home/wangbing/Git/tensorflow/tensorflow/core/kernels/BUILD:297:1: C++ compilation of rule '//tensorflow/core/kernels:mirror_pad_op' failed: crosstool_wrapper_driver_is_not_gcc failed: error executing command
(cd /home/wangbing/.cache/bazel/_bazel_wangbing/ab8decc7da56ae5392500261af1cc855/tensorflow && \
exec env - \
PATH=/home/wangbing/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/home/wangbing/bin \
third_party/gpus/crosstool/clang/bin/crosstool_wrapper_driver_is_not_gcc -U_FORTIFY_SOURCE '-D_FORTIFY_SOURCE=1' -fstack-protector -fPIE -Wall -Wunused-but-set-parameter -Wno-free-nonheap-object -fno-omit-frame-pointer -g0 -O2 -DNDEBUG -ffunction-sections -fdata-sections '-std=c++11' -iquote . -iquote bazel-out/local_linux-opt/genfiles -iquote external/bazel_tools -iquote bazel-out/local_linux-opt/genfiles/external/bazel_tools -iquote external/farmhash_archive -iquote bazel-out/local_linux-opt/genfiles/external/farmhash_archive -iquote external/jpeg_archive -iquote bazel-out/local_linux-opt/genfiles/external/jpeg_archive -iquote external/png_archive -iquote bazel-out/local_linux-opt/genfiles/external/png_archive -iquote external/re2 -iquote bazel-out/local_linux-opt/genfiles/external/re2 -iquote external/eigen_archive -iquote bazel-out/local_linux-opt/genfiles/external/eigen_archive -isystem google/protobuf/src -isystem bazel-out/local_linux-opt/genfiles/google/protobuf/src -isystem external/bazel_tools/tools/cpp/gcc3 -isystem external/farmhash_archive/farmhash-34c13ddfab0e35422f4c3979f360635a8c050260 -isystem bazel-out/local_linux-opt/genfiles/external/farmhash_archive/farmhash-34c13ddfab0e35422f4c3979f360635a8c050260 -isystem external/jpeg_archive/jpeg-9a -isystem bazel-out/local_linux-opt/genfiles/external/jpeg_archive/jpeg-9a -isystem external/png_archive/libpng-1.2.53 -isystem bazel-out/local_linux-opt/genfiles/external/png_archive/libpng-1.2.53 -isystem external/re2 -isystem bazel-out/local_linux-opt/genfiles/external/re2 -isystem third_party/eigen3 -isystem bazel-out/local_linux-opt/genfiles/third_party/eigen3 -isystem external/eigen_archive/eigen-eigen-a5e9085a94e8 -isystem bazel-out/local_linux-opt/genfiles/external/eigen_archive/eigen-eigen-a5e9085a94e8 -isystem third_party/gpus/cuda/include -isystem bazel-out/local_linux-opt/genfiles/third_party/gpus/cuda/include -isystem third_party/gpus/cuda -isystem bazel-out/local_linux-opt/genfiles/third_party/gpus/cuda -fno-exceptions -DEIGEN_AVOID_STL_ARRAY -DTENSORFLOW_USE_EIGEN_THREADPOOL '-DGOOGLE_CUDA=1' -pthread '-DGOOGLE_CUDA=1' -no-canonical-prefixes -Wno-builtin-macro-redefined '-D__DATE__="redacted"' '-D__TIMESTAMP__="redacted"' '-D__TIME__="redacted"' -fno-canonical-system-headers '-frandom-seed=bazel-out/local_linux-opt/bin/tensorflow/core/kernels/_objs/mirror_pad_op/tensorflow/core/kernels/mirror_pad_op.o' -MD -MF bazel-out/local_linux-opt/bin/tensorflow/core/kernels/_objs/mirror_pad_op/tensorflow/core/kernels/mirror_pad_op.d -c tensorflow/core/kernels/mirror_pad_op.cc -o bazel-out/local_linux-opt/bin/tensorflow/core/kernels/_objs/mirror_pad_op/tensorflow/core/kernels/mirror_pad_op.o): com.google.devtools.build.lib.shell.BadExitStatusException: Process exited with status 4.
gcc: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.8/README.Bugs> for instructions.看到該錯誤的第一眼一直以為是由exec env - 導致的終端退出，在研究exec 命令上卡了半天，後來手動執行該命令是可以成功運行的，說明命令本身沒有什麼問題。
後來在GitHub上偶然發現了項目本身的成員提到status 4 是內存不足的問題，只需要增加swap空間即可。
該問題順利解決。
Ubuntu下增加swap空間的命令如下：
# 生成swap鏡像文件
sudo dd if=/dev/zero of=/mnt/512Mb.swap bs=1M count=512
# 對該鏡像文件格式化
sudo mkswap /mnt/512Mb.swap
# 掛載該鏡像文件
sudo swapon /mnt/512Mb.swap至此，使用free -m 即可查看到swap空間已經增加成功。
