https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93197
Bug ID: 93197
Summary: -fpatchable-function-entries :
__patchable_function_entries does not survive under
--gc-sections
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: i at maskray dot me
Target Milestone: ---
__patchable_function_entries is not a GC root, and not referenced by a retained
section. It will thus be garbage collected.
The only solution I can think of requires fixes to both GCC and GNU ld.
* GNU ld: implement interaction between SHF_LINK_ORDER and --gc-sections
https://sourceware.org/bugzilla/show_bug.cgi?id=24526
* GCC: Create one __patchable_function_entry section for each function. For
each function `foo`,
+ If foo needs to be placed in a comdat group, place
__patchable_function_entry in the comdat group
+ Otherwise, set the SHF_LINK_ORDER flag of __patchable_function_entry and
set its sh_link to reference the section containing `foo`
