Bug 173202

Summary: CONFIG_DEBUG_INFO=y by default
Product: Red Hat Enterprise Linux 4 Reporter: Jean Blouin <blouin>
Component: kernelAssignee: Dave Jones <davej>
Status: CLOSED NOTABUG QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.0CC: davej, pfrields
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Hardware: x86_64   
OS: Linux   
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Last Closed: 2005-11-15 04:17:06 UTC Type: ---
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Description Jean Blouin 2005-11-14 22:02:30 UTC
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Description of problem:
The default config file sets

the following config options:

CONFIG_DEBUG_INFO=y
and 
CONFIG_CC_OPTIMIZE_FOR_SIZE=y

this ends up compiling most of the files with 
-g -Os

wouldn't it be preferable for performance to compile with both this options unsetted? Than the code would be compiled with -O2?


Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-22.EL

How reproducible:
Always

Steps to Reproduce:
1.compile the kernel with make bzImage V=1
2.see that most files are compiled with -g -Os
3.
  

Actual Results:  most kernel files are compiled with -g -Os

Expected Results:  if you unsetted the CONFIG_DEBUG_INFO and the CONFIG_CC_OPTIMIZE_FOR_SIZE
then most file will be compile with -O2

Additional info:

Comment 1 Dave Jones 2005-11-15 04:17:06 UTC
debug info is set so that the debugging info can get stripped out to the
-debuginfo rpms.

-Os is used because cache footprint is more important on modern processors than
microoptimisations.