[llvm-bugs] [Bug 38390] New: Subprocesses cannot open input files created by bugpoint

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38390

            Bug ID: 38390
           Summary: Subprocesses cannot open input files created by
                    bugpoint
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: bugpoint
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm at meinersbur.de
                CC: llvm-bugs at lists.llvm.org

Commit r334630 ("LTO: Keep file handles open for memory mapped files.") broke
bugpoint on Windows. The launched opt process cannot access the input file
created by bugpoint:

$ (cd 'C:\Users\MEINER~1\AppData\Local\Temp\reproduce-bruxta1h' &&
'C:\Users\meinersbur\build\llvm\release\bin\bugpoint.exe'
'-opt-command=C:\Users\meinersbur\build\llvm\release\bin\opt.exe'
'C:\Users\MEINER~1\AppData\Local\Temp\reproduce-bruxta1h\pr3821817-precompute.ll'
-scoped-noalias -polly-codegen)
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-b43aded.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-6517e54.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-6575634.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-7dad9ae.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-81165ee.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-018d544.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-e88e95a.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-d37f5e8.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-29843f5.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-26d3c62.bc: error: Could not open input file:
permission denied
C:\Users\meinersbur\build\llvm\release\bin\opt.exe:
bugpoint-input-dc3b1bc.bc: error: Could not open input file:
permission denied
verify failed!

bugpoint-input-b43aded.bc is a strange file. I can see it in explorer,
but when trying to open it, Notepad claims it doesn't exist and offers
to create it (which will then fail).

Also see
https://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20180723/573040.html

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