[PATCH] D36413: Use "foo-12345.o.tmp" 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.tmp", tools like this could now have a rule to ignore .tmp files.

This is a less ambitious reland of https://reviews.llvm.org/D36238


https://reviews.llvm.org/D36413

Files:
  lib/Frontend/CompilerInstance.cpp


Index: lib/Frontend/CompilerInstance.cpp
===================================================================
--- lib/Frontend/CompilerInstance.cpp
+++ lib/Frontend/CompilerInstance.cpp
@@ -759,9 +759,15 @@
 
   if (UseTemporary) {
     // Create a temporary file.
-    SmallString<128> TempPath;
-    TempPath = OutFile;
+    // Insert -%%%%%%%% before the extension (if any), and because some tools
+    // (noticeable, clang's own GlobalModuleIndex.cpp) glob for build
+    // artifacts, also append .tmp.
+    StringRef OutputExtension = llvm::sys::path::extension(OutFile);
+    SmallString<128> TempPath =
+        StringRef(OutFile).drop_back(OutputExtension.size());
     TempPath += "-%%%%%%%%";
+    TempPath += OutputExtension;
+    TempPath += ".tmp";
     int fd;
     std::error_code EC =
         llvm::sys::fs::createUniqueFile(TempPath, fd, TempPath);


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