[llvm-bugs] [Bug 46050] New: Output files are fragmented

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46050

            Bug ID: 46050
           Summary: Output files are fragmented
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: lev-sch at mail.ru
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 23525
  --> https://bugs.llvm.org/attachment.cgi?id=23525&action=edit
files to reproduce

Hello.

I've found that clang++.exe produces fragmented output files.
Average fragmentation is 3 fragments per file.

Please make output without fragmentation. It helps to get high compilation
speed.

Steps to reproduce on windows platform:
1. unpack attachment
2. fill configuration area in run.cmd
3. start run.cmd
4. wait for all clang processes are created and wait for they exit
5. use "getFileFragmentation.cmd path_to_out" command to get fragmentation info
for output folder. (getFileFragmentation.cmd can be added to
%APPDATA%\Microsoft\Windows\SendTo)

Solution described is here
https://sourceforge.net/p/sevenzip/feature-requests/981/

> D:\temp\clangFragmentation\out\f1.dep is in 4 fragments
> D:\temp\clangFragmentation\out\f1.o is in 2 fragments
> (...)
> 
> Summary:
>      Number of files processed:      48
>      Number unsuccessfully procesed: 0
>      Average fragmentation       : 3 frags/file

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