Use correct TMP dir on macOS (#513)

IB-7606

Signed-off-by: Raul Metsma <raul@metsma.ee>

Signed-off-by: Raul Metsma <raul@metsma.ee>

README.md

@@ -117,7 +117,7 @@
 
 6. Alternative to steps 4. and 5. -
 
-        powershell -ExecutionPolicy ByPass -File build.ps1 -toolset 141
+        powershell -ExecutionPolicy ByPass -File build.ps1 -toolset 142
 
     The build script builds executables and installation media for all
     platforms (x86 and x64 / Debug and Release with debug symbols)

src/util/File.cpp

@@ -362,15 +362,19 @@ string File::tempFileName()
 #ifdef _WIN32
     // requires TMP environment variable to be set
     wchar_t *fileName = _wtempnam(nullptr, nullptr); // TODO: static buffer, not thread-safe
-    if ( !fileName )
+    if(!fileName)
         THROW("Failed to create a temporary file name.");
+    string path = decodeName(fileName);
+    free(fileName);
+#else
+#ifdef __APPLE__
+    string path = env("TMPDIR") + "/XXXXXX";
 #else
-    char *fileName = strdup("/tmp/XXXXXX");
-    if (mkstemp(fileName) == -1)
+    string path = "/tmp/XXXXXX";
+#endif
+    if(mkstemp(path.data()) == -1)
         THROW("Failed to create a temporary file name.");
 #endif
-    string path = decodeName(fileName);
-    free(fileName);
     tempFiles.push(path);
     return path;
 }