[PATCH] D82733: [clang][docs] Add note about using `-flto` with `-g` on macOS
Jonas Devlieghere via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Tue Jun 30 09:45:27 PDT 2020
This revision was automatically updated to reflect the committed changes.
Closed by commit rGa1f4e48c4aca: [clang][docs] Add note about using `-flto` with `-g` on macOS (authored by phil-blain, committed by JDevlieghere).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D82733/new/
https://reviews.llvm.org/D82733
Files:
clang/docs/CommandGuide/clang.rst
Index: clang/docs/CommandGuide/clang.rst
===================================================================
--- clang/docs/CommandGuide/clang.rst
+++ clang/docs/CommandGuide/clang.rst
@@ -474,6 +474,16 @@
optimization. With "thin", :doc:`ThinLTO <../ThinLTO>`
compilation is invoked instead.
+ .. note::
+
+ On Darwin, when using :option:`-flto` along with :option:`-g` and
+ compiling and linking in separate steps, you also need to pass
+ ``-Wl,-object_path_lto,<lto-filename>.o`` at the linking step to instruct the
+ ld64 linker not to delete the temporary object file generated during Link
+ Time Optimization (this flag is automatically passed to the linker by Clang
+ if compilation and linking are done in a single step). This allows debugging
+ the executable as well as generating the ``.dSYM`` bundle using :manpage:`dsymutil(1)`.
+
Driver Options
~~~~~~~~~~~~~~
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