Note: This is a beta release of Red Hat Bugzilla 5.0. The data contained within is a snapshot of the live data so any changes you make will not be reflected in the production Bugzilla. Also email is disabled so feel free to test any aspect of the site that you want. File any problems you find or give feedback here.

Bug 452958

Summary: Line number info first line is behind the first instr
Product: [Fedora] Fedora Reporter: Jan Kratochvil <jan.kratochvil>
Component: gccAssignee: Jakub Jelinek <jakub>
Status: CLOSED UPSTREAM QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: 9CC: aoliva
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-07-01 15:35:08 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
The sample code whilemain.c none

Description Jan Kratochvil 2008-06-26 09:08:39 UTC
Description of problem:
So far -O0 code could be safely debugged.  In F9 if you `break func' the
breakpoint can be missed despite the function got executed.

Version-Release number of selected component (if applicable):
gcc-4.3.0-8.x86_64 (F-9, broken)
gcc-4.3.1-3.x86_64 (Rawhide, broken)
F-8 was correct: gcc-4.1.2-33.x86_64

How reproducible:
Always.

Steps to Reproduce:
1. gcc -o whilemain whilemain.c -Wall -ggdb2
2. gdb -ex 'file ./whilemain' -ex 'b func' -ex r 

Actual results:
Program exited normally.

Expected results:
Breakpoint 1, func () at whilemain.c:5
5	  while (i == 1)

Additional info:
Sure a better approach would be a prologue-end marker not being emitted now (Bug
185789).  Still the line number information is wrong.

F-9:
000000000040047c <func>:
int i;

void func (void)
{
  40047c:	55                   	push   %rbp
  40047d:	48 89 e5             	mov    %rsp,%rbp
  400480:	eb 0a                	jmp    40048c <func+0x10>
  while (i == 1)
    i = 0;
  400482:	c7 05 fc 03 20 00 00 	movl   $0x0,0x2003fc(%rip)        # 600888 <i>
  400489:	00 00 00 

F-8:
0000000000400468 <func>:
int i;

void func (void)
{
  400468:	55                   	push   %rbp
  400469:	48 89 e5             	mov    %rsp,%rbp
  while (i == 1)
  40046c:	eb 0a                	jmp    400478 <func+0x10>
    i = 0;
  40046e:	c7 05 fc 03 20 00 00 	movl   $0x0,0x2003fc(%rip)        # 600874 <i>
  400475:	00 00 00

Comment 1 Jan Kratochvil 2008-06-26 09:08:39 UTC
Created attachment 310316 [details]
The sample code whilemain.c