travis: add Windows cross-compilation

Summary:
- downcase includes for case-sensitive filesystems
- give targets the same name (librocksdb) on all platforms

With this patch it is possible to cross-compile RocksDB for Windows
from a Linux host using mingw.

cc yuslepukhin orgads
Closes https://github.com/facebook/rocksdb/pull/2107

Differential Revision: D4849784

Pulled By: siying

fbshipit-source-id: ad26ed6b4d393851aa6551e6aa4201faba82ef60

.travis.yml

@@ -16,7 +16,7 @@ cache:
 addons:
    apt:
       sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-precise-3.6']
-      packages: ['clang-3.6' , 'g++-6', 'zlib1g-dev', 'libbz2-dev', 'libsnappy-dev', 'curl', 'libgflags-dev']
+      packages: ['clang-3.6' , 'g++-6', 'zlib1g-dev', 'libbz2-dev', 'libsnappy-dev', 'curl', 'libgflags-dev', 'mingw-w64']
 env:
   - TEST_GROUP=platform_dependent1
   - TEST_GROUP=platform_dependent2
@@ -30,6 +30,7 @@ env:
   # Build examples
   - JOB_NAME=examples
   - JOB_NAME=cmake
+  - JOB_NAME=cmake-mingw
 
 matrix:
   exclude:
@@ -39,6 +40,11 @@ matrix:
     env: TEST_GROUP=1
   - os: osx
     env: TEST_GROUP=2
+  - os : osx
+    env: JOB_NAME=cmake-mingw
+  - os: linux
+    env: JOB_NAME=cmake-mingw
+    compiler: clang
 
 before_script:
   - if [[ "${TRAVIS_OS_NAME}" == 'linux' && "${CXX}" == 'clang++' ]]; then CXX=clang++-3.6; fi
@@ -58,6 +64,7 @@ script:
   - if [[ "${JOB_NAME}" == 'lite_build' ]]; then OPT="-DTRAVIS -DROCKSDB_LITE" V=1 make -j4 static_lib; fi
   - if [[ "${JOB_NAME}" == 'examples' ]]; then OPT=-DTRAVIS V=1 make -j4 static_lib; cd examples; make -j4; fi
   - if [[ "${JOB_NAME}" == 'cmake' ]]; then mkdir build && cd build && cmake .. && make -j4 rocksdb; fi
+  - if [[ "${JOB_NAME}" == 'cmake-mingw' ]]; then mkdir build && cd build && cmake .. -DCMAKE_C_COMPILER=x86_64-w64-mingw32-gcc -DCMAKE_CXX_COMPILER=x86_64-w64-mingw32-g++ -DCMAKE_SYSTEM_NAME=Windows && make -j4 rocksdb; fi
 notifications:
     email:
       - leveldb@fb.com

CMakeLists.txt

@@ -506,16 +506,14 @@ else()
     env/io_posix.cc)
 endif()
 
+set(ROCKSDB_STATIC_LIB rocksdb${ARTIFACT_SUFFIX})
+set(ROCKSDB_SHARED_LIB rocksdb-shared${ARTIFACT_SUFFIX})
+set(ROCKSDB_IMPORT_LIB ${ROCKSDB_SHARED_LIB})
 if(WIN32)
   set(SYSTEM_LIBS ${SYSTEM_LIBS} Shlwapi.lib Rpcrt4.lib)
-  set(ROCKSDB_STATIC_LIB rocksdblib${ARTIFACT_SUFFIX})
-  set(ROCKSDB_IMPORT_LIB rocksdb${ARTIFACT_SUFFIX})
   set(LIBS ${ROCKSDB_STATIC_LIB} ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
 else()
   set(SYSTEM_LIBS ${CMAKE_THREAD_LIBS_INIT} rt)
-  set(ROCKSDB_STATIC_LIB rocksdb${ARTIFACT_SUFFIX})
-  set(ROCKSDB_SHARED_LIB rocksdb-shared)
-  set(ROCKSDB_IMPORT_LIB ${ROCKSDB_SHARED_LIB})
   set(LIBS ${ROCKSDB_SHARED_LIB} ${THIRDPARTY_LIBS} ${SYSTEM_LIBS})
 
   add_library(${ROCKSDB_SHARED_LIB} SHARED ${SOURCES})

db/c_test.c

@@ -20,7 +20,7 @@
 // Can not use port/port.h macros as this is a c file
 #ifdef OS_WIN
 
-#include <Windows.h>
+#include <windows.h>
 
 #define snprintf _snprintf
 

port/win/env_win.cc

@@ -35,8 +35,8 @@
 #include "monitoring/thread_status_updater.h"
 #include "monitoring/thread_status_util.h"
 
-#include <Rpc.h>  // For UUID generation
-#include <Windows.h>
+#include <rpc.h>  // for uuid generation
+#include <windows.h>
 
 namespace rocksdb {
 

port/win/env_win.h

@@ -21,7 +21,7 @@
 #include "util/threadpool_imp.h"
 
 #include <stdint.h>
-#include <Windows.h>
+#include <windows.h>
 
 #include <mutex>
 #include <vector>

port/win/io_win.h

@@ -14,11 +14,11 @@
 #include <mutex>
 #include <string>
 
-#include "rocksdb/Status.h"
+#include "rocksdb/status.h"
 #include "rocksdb/env.h"
 #include "util/aligned_buffer.h"
 
-#include <Windows.h>
+#include <windows.h>
 
 
 namespace rocksdb {
@@ -77,8 +77,8 @@ class WinFileData {
  public:
   // We want this class be usable both for inheritance (prive
   // or protected) and for containment so __ctor and __dtor public
-  WinFileData(const std::string& filename, HANDLE hFile, bool use_direct_io)
-      : filename_(filename), hFile_(hFile), use_direct_io_(use_direct_io) {}
+  WinFileData(const std::string& filename, HANDLE hFile, bool direct_io)
+      : filename_(filename), hFile_(hFile), use_direct_io_(direct_io) {}
 
   virtual ~WinFileData() { this->CloseFile(); }
 

port/win/win_logger.h

@@ -19,7 +19,7 @@
 #include "rocksdb/env.h"
 
 #include <stdint.h>
-#include <Windows.h>
+#include <windows.h>
 
 namespace rocksdb {
 

port/win/win_thread.cc

@@ -13,7 +13,7 @@
 
 #include <assert.h>
 #include <process.h> // __beginthreadex
-#include <Windows.h>
+#include <windows.h>
 
 #include <stdexcept>
 #include <system_error>

port/win/xpress_win.cc

@@ -10,7 +10,7 @@
 // found in the LICENSE file. See the AUTHORS file for names of contributors.
 
 #include "port/win/xpress_win.h"
-#include <Windows.h>
+#include <windows.h>
 
 #include <cassert>
 #include <memory>

util/log_buffer.cc

@@ -62,12 +62,13 @@ void LogBuffer::FlushBufferToLog() {
   for (BufferedLog* log : logs_) {
     const time_t seconds = log->now_tv.tv_sec;
     struct tm t;
-    localtime_r(&seconds, &t);
+    if (localtime_r(&seconds, &t) != nullptr) {
       Log(log_level_, info_log_,
           "(Original Log Time %04d/%02d/%02d-%02d:%02d:%02d.%06d) %s",
           t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,
           t.tm_sec, static_cast<int>(log->now_tv.tv_usec), log->message);
     }
+  }
   logs_.clear();
 }