** Description changed:
This bug was observed on multiple versions of Ubuntu and clang.
Versions:
Ubuntu: Ubuntu 18.04.5 LTS, Ubuntu 20.04.1 LTS
clang: 8.0.0-3~ubuntu18.04.2, 9.0.0-2~ubuntu18.04.2,
10.0.0-4ubuntu1~18.04.2,
9.0.1-12, 10.0.0-4ubuntu1
When trying to use OMPT (https://www.openmp.org/spec-
html/5.0/openmpch4.html) by defining the corresponding functions in an
shared object and loading it with LD_PRELOAD it gives no result. The
functions are not called, not even the first function: ompt_start_tool.
I have included a small code to reproduce the bug.
To run it just do:
make
make run
The expected output is (up to execution reordering):
ompt_start_tool was called
Hello from thread 0 of 4!
Hello from thread 3 of 4!
Hello from thread 2 of 4!
Hello from thread 1 of 4!
While Ubuntu outputs (up to execution reordering):
Hello from thread 0 of 4!
Hello from thread 3 of 4!
Hello from thread 2 of 4!
Hello from thread 1 of 4!
It does not call ompt_start_tool.
It works as expected on Fedora 32 with clang version 10.0.1-2. It also
works as expected on Debian GNU/Linux bullseye/sid with clang version
- 9.0.1-14. Thus, it's a bug.
+ 9.0.1-14.
+
+ The problem lies in libomp.so.5. When replacing it by the one from a
+ working Debian version the program runs as expected.
** Also affects: llvm-toolchain-8 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: llvm-toolchain-9 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: llvm-toolchain-10 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1899199
Title:
OMPT with LD_PRELOAD not working
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