Bug 239152

Summary:	strange debuging messages with g++ (gcc 4.1.2) & gdb 6.7.1
Product:	Gentoo Linux	Reporter:	pavel sanda <ps>
Component:	[OLD] Core system	Assignee:	Gentoo Linux bug wranglers <bug-wranglers>
Status:	RESOLVED INVALID
Severity:	normal	CC:	SebastianLuther
Priority:	High
Version:	unspecified
Hardware:	x86
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Attachments:	file.c

Description pavel sanda 2008-09-30 14:18:14 UTC

i got some strange bugs on my system and when i've tried to find out whats the problem i arrive to the attached small example.
when i compile it this way:
g++ pom.c -Wall -g -Wextra

then i launch gdb(6.7.1-r3) and set arguments this way:
set args 0.7 0 10000 10
when i come to the lines:
double alpha=0.1;
alpha=atof(argv[1]);

variable doesn't change its value at all.

can anybody reproduce it?

Reproducible: Always

Steps to Reproduce:

Comment 1 pavel sanda 2008-09-30 14:19:37 UTC

Created attachment 166829 [details]
file.c

Comment 2 pavel sanda 2008-09-30 14:39:59 UTC

perhaps there is nothing wrong with the gcc, only gdb does not recognize it has been compiled via g++. gcc compilation is ok, and printf of alpha works also ok.

Comment 3 Sebastian Luther (few) 2008-09-30 21:01:30 UTC

The reason for this is that your program contains the variable "alpha" twice. If you are not lucky enough gdb prints the wrong one with "print alpha". You can see them both with "info locals". Rename one of your alpha's and you get what you expect.

Comment 4 pavel sanda 2008-09-30 21:06:32 UTC

aha, so this is not a bug; i will close it then.