https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100618
Bug ID: 100618
Summary: Add a -fno-semantic-interposition variant which allows
variable interposition
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: i at maskray dot me
Target Milestone: ---
Extracted from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100483
The documentation says -fno-semantic-interposition applies to variables.
Having an option which only apply to external linkage function definitions will
be useful. Assuming no-variable-interposition is unfortunately incompatible
with the plethora of copy relocations: -fno-pic emits direct access relocations
referencing a global variable. If the global variable turns out to be defined
in a shared object, there will be a copy relocation in the executable. The
object the shared object sees and the executable sees will be different.
See
https://maskray.me/blog/2021-05-16-elf-interposition-and-bsymbolic#the-last-alliance-of-elf-and-men
for more context.
