[LLVMbugs] [Bug 13511] New: clang is unable to make temporary file when a directory owned by another user with the same basename as the file being compiled exists in /tmp

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13511

             Bug #: 13511
           Summary: clang is unable to make temporary file when a
                    directory owned by another user with the same basename
                    as the file being compiled exists in /tmp
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: jordy.potman at recoresystems.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Steps to reproduce:
$ cat test.c
int main(void) {
}
$ sudo mkdir /tmp/test
$ clang test.c 
clang: error: unable to make temporary file: /tmp/test: can't make unique
filename: Permission denied
$ clang -v
clang version 3.2 (http://llvm.org/git/clang.git
207c408b14f0c29d65d6ad311456be94b812d5dd) (http://llvm.org/git/llvm.git
1c3781496081b47412fc70393bcdc5b67b440b02)
Target: x86_64-unknown-linux-gnu
Thread model: posix

It works fine if /tmp contains a file test owned by root instead of a directory
test:
$ sudo rmdir /tmp/test
$ sudo touch /tmp/test
$ clang test.c

This is caused by Path::makeUnique trying to make a unique directory *in* path
if path is a directory instead of making path unique (line 829 and further in
llvm/lib/Support/Unix/Path.inc).

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