For a default visibility external linkage definition, dso_local is set for ELF
-fno-pic/-fpie and COFF and Mach-O. Since default clang -cc1 for ELF is similar
to -fpic ("PIC Level" is not set), this nuance causes unneeded binary format differences.
To make emitted IR similar, ELF -cc1 -fpic will default to -fno-semantic-interposition,
which sets dso_local for default visibility external linkage definitions.
To make this flip smooth and enable future (dso_local as definition default),
this patch replaces (function) `define ` with `define{{.*}} `,
(variable/constant/alias) `= ` with `={{.*}} `, or inserts appropriate `{{.*}} `.
AMDGPU currently relies on global properties being set before
setTargetProperties is called. Existing targets like MIPS which rely on
setTargetProperties do not rely on the current behavior, so this patch
moves the call later in SetFunctionAttributes.
Differential Revision: https://reviews.llvm.org/D60967
llvm-svn: 359039
This allows the global visibility controls to be restrictive while still
populating the dynamic symbol table where required.
Differential Revision: https://reviews.llvm.org/D56871
llvm-svn: 353870
Fangrui Song