[LLVMbugs] [Bug 9374] New: clang makes a lot of system calls for output files

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9374

           Summary: clang makes a lot of system calls for output files
           Product: clang
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: gohman at apple.com
                CC: llvmbugs at cs.uiuc.edu


Running clang -c testcase.c gets the following in a system call trace (which
I've manually filtered):

[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] access("testcase.o", W_OK)  = 0
[pid 17523] stat("testcase.o", {st_mode=S_IFREG|0600, st_size=1120, ...}) = 0
[pid 17523] open("testcase.o-rM0aoW", O_RDWR|O_CREAT|O_EXCL, 0600) = 3
[pid 17523] close(3)                    = 0
[pid 17523] open("testcase.o-rM0aoW", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
[pid 17523] close(3)                    = 0
[pid 17523] open("testcase.o-rM0aoW", O_WRONLY|O_CREAT|O_TRUNC, 0664) = 3
[pid 17523] fstat(3, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
[pid 17523] close(3)                    = 0
[pid 17523] rename("testcase.o-rM0aoW", "testcase.o") = 0

This is pretty excessive. A fair amount of it appears to have come from
r114187, which was apparently intended for AST/PCH files, but was implemented
to apply to all output files.

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