https://sourceware.org/bugzilla/show_bug.cgi?id=28032
Bug ID: 28032
Summary: eu-readelf --debug-dump=line stops after finding a
table without line number statements.
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: tools
Assignee: unassigned at sourceware dot org
Reporter: vifoxa2454 at advew dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
We use an ABI dumper (https://github.com/lvc/abi-dumper) to make sure we don't
accidentally release binary incompatible changes by mistake. This tool uses
"eu-readelf --debug-dump=line" to get some of the information it needs.
In version 0.180 this worked fine, but when we upgraded to 0.182 it stopped
working. After some digging I found that a change in 0.181 caused the issue.
I found this link describing the change:
https://www.mail-archive.com/search?l=elfutils-devel@sourceware.org&q=subject:%22%5C%5BPATCH%5C%5D+readelf%5C%3A+It+is+not+an+error+if+there+are+no+line+number+statements%22&o=newest&f=1
Running "eu-readelf --debug-dump=line" on one of our shared libraries I get 92
tables on version 0.180, but only 6 tables on version 0.182. The last line in
the output of the 0.182 version is "No line number statements". The
corresponding table in version 0.180 says only "Line number statements:" and
then nothing. That table is very small (length 317, prologue length 311).
I believe that the bug is that the tool stops at this point instead of
continuing with the next table.
The problematic code (in src/readelf.c taken from version 0.185):
if (linep == lineendp)
{
puts (_("\nNo line number statements."));
return;
}
If I comment out that block the tool work again for our use case.
Maybe some sort if if/else would be better?
I am not sure what would fit that code best as I have not done any deep diving
into it.
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