src/ld ChangeLog ldmisc.c

[vapier at sourceware dot org]

CVSROOT:	/cvs/src
Module name:	src
Changes by:	vapier@sourceware.org	2012-04-03 03:37:26

Modified files:
	ld             : ChangeLog ldmisc.c 

Log message:
	ld: optimize vfinfo output slightly
	
	ld atm ends up calling the write() syscall on every char when displaying
	an error message.  For example:
	$ echo 'main(){foo();}' | strace -f -ewrite gcc -x c -o /dev/null -
	...
	[pid 13035] write(2, ":", 1)            = 1
	[pid 13035] write(2, " ", 1)            = 1
	[pid 13035] write(2, "I", 1)            = 1
	[pid 13035] write(2, "n", 1)            = 1
	[pid 13035] write(2, " ", 1)            = 1
	[pid 13035] write(2, "f", 1)            = 1
	[pid 13035] write(2, "u", 1)            = 1
	[pid 13035] write(2, "n", 1)            = 1
	[pid 13035] write(2, "c", 1)            = 1
	[pid 13035] write(2, "t", 1)            = 1
	[pid 13035] write(2, "i", 1)            = 1
	[pid 13035] write(2, "o", 1)            = 1
	[pid 13035] write(2, "n", 1)            = 1
	[pid 13035] write(2, " ", 1)            = 1
	[pid 13035] write(2, "`", 1)            = 1
	...
	
	That's just to write ": In function `main':".  A slight optimization in
	the vfinfo() func gives a much more reasonable syscall footprint:
	...
	write(2, ": In function `", 15)         = 15
	...
	
	Signed-off-by: Mike Frysinger <vapier@gentoo.org>

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/ld/ChangeLog.diff?cvsroot=src&r1=1.2425&r2=1.2426
http://sourceware.org/cgi-bin/cvsweb.cgi/src/ld/ldmisc.c.diff?cvsroot=src&r1=1.42&r2=1.43