http://llvm.org/bugs/show_bug.cgi?id=2826
Summary: google-perftools GetStackTrace fails under LLVM
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=2038)
--> (http://llvm.org/bugs/attachment.cgi?id=2038)
GetStackTrace extracted testcase
google-perftools includes a heap checker which works by a malloc replacement.
The attached testcase is an extraction from the larger code, which tries to
retrieve a stack trace. For some reason, this program doesn't work under LLVM:
$ g++ -Wall -pedantic reduced.cpp -o reduced -g -O0
$ ./reduced
0x80483f1
0xf7cea455
0x80485be
$ llvm-g++ -Wall -pedantic reduced.cpp -o reduced -g -O0
$ ./reduced
$
I realize that 'stack' isn't entirely defined in the C standard, but I don't
think this program is invoking undefined behaviour in a way that LLVM is
allowed to optimize away. Changing optz'n levels and debugging on/off has no
effect. The program is valgrind clean, no matter how it's compiled.
I'm seeing this problem on i386. I haven't tried x86_64.
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