[Openmp-commits] [PATCH] D112809: [OpenMP][OMPT] Introduce VERBOSE_INIT in ompt-multiplex.h

Joachim Protze via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Fri Oct 29 05:13:39 PDT 2021

protze.joachim created this revision.
protze.joachim added a reviewer: hbae.
protze.joachim added a project: OpenMP.
Herald added subscribers: guansong, yaxunl.
protze.joachim requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added a subscriber: sstefan1.

OpenMP 5.1 added OMP_TOOL_VERBOSE_INIT. This env variable is
extremely helpful to understand the issue when loading a tool fails
unexpectedly (e.g., errors from dlopen, when the libc available at
runtime is older than libc used at compile time of the tool -> missed
to load the right gcc module).

This patch replicates the verbose init code from libomp watching
out for a different env variable. Similar to 
`CLIENT_TOOL_LIBRARIES_VAR`, a tool can define the name of 
the env var by defining `CLIENT_TOOL_VERBOSE_INIT_VAR` 
before including ompt-multiplex.h.
Alternatively, a tool can define `OMPT_MULTIPLEX_TOOL_NAME`
to specify the tool name which will be the prefix for both 
Finally, if none of the two macros is defined, the header will 
print a compiler warning and look at `OMP_TOOL_VERBOSE_INIT`.

Patch prepared by Semih Burak

  rG LLVM Github Monorepo



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