[Bug lto/63242] New: memory starvation caused by flatten attribute

[wbrana at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63242

            Bug ID: 63242
           Summary: memory starvation caused by flatten attribute
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: wbrana at gmail dot com

forwarded from https://bugs.freedesktop.org/show_bug.cgi?id=77580

Hello,
    I've been testing GCC 4.9 for a virtual gentoo machine and I noticed that
you us flatten attribute in source code. In case of src/sna/sna_glyphs.c
flatten functions, inliner inlines about 3.3M functions and crashes because of
no free memory (I have 8GB memory).

Please notice that LTO has ability to optimize whole program. As a result, it
sees almost all function bodies and that leads to enormous inlining.

Suggested patch removes these flatten attributes for selected functions.

Thank you,
MArtin