[bug #30328] Fast echo (with code proposal)

[anonymous]

URL:
  <http://savannah.gnu.org/bugs/?30328>

                 Summary: Fast echo (with code proposal)
                 Project: make
            Submitted by: None
            Submitted on: Fri 02 Jul 2010 04:41:09 PM UTC
                Severity: 3 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: CVS
        Operating System: Any
           Fixed Release: None
           Triage Status: None

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Details:

Hi,

Elaborated build systems based on GNU make tend to employ many 'echo'
commands in their receipes for logging/tracing purposes.

These 'echo' commands (each and every creating a child process)introduce
noticeable delay in those type of builds.

This can very easily be avoided by handling "those" 'echo' commands
internally. Fortunately construct_command_argv() already differentiates
between "those" simple logging/tracing 'echo' commands and 'echo' commands
i.e. redirecting their output into files: If construct_command_argv() comes to
the conclusion that 'echo' can be called directly without a shell then it is
save to go one step further and avoid a child process altogether.

Please find attached the code to accomplish this. It is supposed to be
inserted right after the (sort of similiar) optimization of empty commands in
job.c.

Oliver Schmidt - oliv.schmidt(at)sap.com



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File Attachments:


-------------------------------------------------------
Date: Fri 02 Jul 2010 04:41:09 PM UTC  Name: echo.c  Size: 439B   By: None

<http://savannah.gnu.org/bugs/download.php?file_id=20881>

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