[PATCH] D36238: Use "foo-12345.o" instead of "foo.o-12345" as temporary file name.

[Nico Weber via Phabricator via cfe-commits]

thakis created this revision.

This helps some tools that do things based on the output's extension.

For example, we got reports from users on Windows that have a tool that scan a build output dir (but skip .obj files). The tool would keep the "foo.obj-12345" file open, and then when clang tried to rename the temp file to the final output filename, that would fail. By making the tempfile end in ".obj", tools like this will now skip the temp files as well.


https://reviews.llvm.org/D36238

Files:
  lib/Frontend/CompilerInstance.cpp


Index: lib/Frontend/CompilerInstance.cpp
===================================================================
--- lib/Frontend/CompilerInstance.cpp
+++ lib/Frontend/CompilerInstance.cpp
@@ -759,9 +759,13 @@
 
   if (UseTemporary) {
     // Create a temporary file.
-    SmallString<128> TempPath;
-    TempPath = OutFile;
+    // Insert -%%%%%%%% before the extension (if any), so that tools doing
+    // things based on the file extension do the right thing.
+    StringRef OutputExtension = llvm::sys::path::extension(OutFile);
+    SmallString<128> TempPath =
+        StringRef(OutFile).drop_back(OutputExtension.size());
     TempPath += "-%%%%%%%%";
+    TempPath += OutputExtension;
     int fd;
     std::error_code EC =
         llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);


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