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
_______________________________________________________
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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