[Bug c++/89389] New: inlining failed in call to always_inline -- removing attribute leaves function inlined

[peter_foelsche at mentor dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89389

            Bug ID: 89389
           Summary: inlining failed in call to always_inline -- removing
                    attribute leaves function inlined
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: peter_foelsche at mentor dot com
  Target Milestone: ---

Some member function is labeled

__attribute__((always_inline)) inline

as are many others. This is generated code and has been working for many cases.
Today I had the first error of this kind.
When removing the attribute the code compiles fine AND does not generate a
function call.

The function itself is trivial (there are many functions for which
always_inline is successful, which are more complicated.


The same error happens with

g++ 5.3.0
g++ 5.5.0
g++ 7.3.0
g++ 8.2.0

compiler options are

-fPIC -I include -O3 -DNDEBUG -funroll-loops -march=native -ffast-math
-fwhole-program -ftemplate-depth=16384 -march=native -shared -std=c++11
-Wno-attributes -I $BOOST_DIR

I'm not certain if I can provide the source code (or any preprocessed file) --
I'll have to ask.