Enable parallel compilation with MinGW and fix gmtime_s detection (#1185)

* Enable parallel compilation with MinGW

* Fix gmtime_s detection in kms_request.c

* Default to C++11 for testing to address MinGW compilation errors

Author: eramongodb

.evergreen/compile-windows-mingw.bat

@@ -8,7 +8,7 @@ set CC=C:\mingw-w64\x86_64-4.9.1-posix-seh-rt_v3-rev1\mingw64\bin\gcc.exe
 
 %CMAKE% -G "MinGW Makefiles" -DCMAKE_MAKE_PROGRAM=%CMAKE_MAKE_PROGRAM% -DCMAKE_PREFIX_PATH=%INSTALL_DIR%\lib\cmake  %CONFIGURE_FLAGS%
 
-%CMAKE_MAKE_PROGRAM%
+%CMAKE_MAKE_PROGRAM% -j
 
 set MONGOC_TEST_SKIP_LIVE=on
 .\src\libmongoc\test-libmongoc.exe --no-fork -d -F test-results.json --skip-tests .evergreen\skip-tests.txt

CMakeLists.txt

@@ -59,6 +59,10 @@ include (CheckLanguage)
 check_language (CXX)
 if (CMAKE_CXX_COMPILER)
    enable_language (CXX)
+   if (NOT CMAKE_CXX_STANDARD)
+      # Default to C++11 for purposes of testing.
+      set (CMAKE_CXX_STANDARD 11)
+   endif ()
 else ()
    message (STATUS "No CXX support")
 endif ()

src/kms-message/src/kms_request.c

@@ -153,10 +153,12 @@ kms_request_set_date (kms_request_t *request, const struct tm *tm)
       /* use current time */
       time_t t;
       time (&t);
-#ifdef _WIN32
+#if defined(BSON_HAVE_GMTIME_R)
+      gmtime_r (&t, &tmp_tm);
+#elif defined(_MSC_VER)
       gmtime_s (&tmp_tm, &t);
 #else
-      gmtime_r (&t, &tmp_tm);
+      tmp_tm = *gmtime (&t);
 #endif
       tm = &tmp_tm;
    }