https://sourceware.org/bugzilla/show_bug.cgi?id=32892
Bug ID: 32892
Summary: source line level informatiion not available with "-g
-O2"
Product: binutils
Version: 2.44
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gprofng
Assignee: vladimir.mezentsev at oracle dot com
Reporter: bruno at clisp dot org
Target Milestone: ---
The documentation of gprofng
https://sourceware.org/binutils/docs/gprofng.html#Main-Features says: "This
tool works with unmodified production level executables. There is no need to
recompile the code, but if the ‘-g’ option has been used when building the
application, source line level information is available."
So, it sounds like binaries built with the options '-g -O2' should be usable
with source line level information.
This is true for valgrind (see
https://gitlab.com/ghwiki/gnow-how/-/wikis/Profiling/with_sampling ), but not
for gprofng.
How to reproduce:
1. wget https://ftp.gnu.org/gnu/gperf/gperf-3.3.tar.gz
2. tar xfz gperf-3.3.tar.gz
3. cd gperf-3.3
4. export CC=gcc; export CXX=g++; unset CFLAGS; unset CXXFLAGS; export
CPPFLAGS=-Wall
5. ./configure
6. make
Observe that the C++ source code gets compiler with "g++ -g -O2".
7. cd src
8. gp-collect-app -o test.1.er -p on -S on ./gperf -m 10 ../tests/5000.gperf >
/dev/null
9. gprofng-display-text test.1.er
(gprofng-display-text) lines
...
13.259 91.63 14.210 98.20 <Function: Search::find_asso_values(),
instructions without line numbers>
...
(gprofng-display-text) source search.cc
Expected:
Lines search.cc 1396..1402 are highlighted as CPU-intensive.
Actual:
Lines search.cc 1396..1402 are not marked in any way.
This is on Linux/x86_64, with g++ 13.3.0.
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