llvm-project/llvm/tools/llvm-lto
Steven Wu 476ca33089 [LTO] Don't apply LTOPostLink module flag during writeMergedModule
For `ld64` which uses legacy LTOCodeGenerator, it relies on
writeMergedModule to perform `ld -r` (generates a linked object file).
If all the inputs to `ld -r` is fullLTO bitcode, `ld64` will linked the
bitcode module, internalize all the symbols and write out another
fullLTO bitcode object file. This bitcode file doesn't have all the
bitcode inputs and it should not have LTOPostLink module flag. It will
also cause error when this bitcode object file is linked with other LTO
object file.
Fix the issue by not applying LTOPostLink flag during writeMergedModule
function. The flag should only be added when all the bitcode are linked
and ready to be optimized.

rdar://problem/58462798

Reviewed By: tejohnson

Differential Revision: https://reviews.llvm.org/D84789
2020-08-26 11:17:45 -07:00
..
CMakeLists.txt Replace MCTargetOptionsCommandFlags.inc and CommandFlags.inc by runtime registration 2020-03-17 14:01:30 +01:00
LLVMBuild.txt
llvm-lto.cpp [LTO] Don't apply LTOPostLink module flag during writeMergedModule 2020-08-26 11:17:45 -07:00