tree 0a39f6297260ae103309687ba61969ed2b6ea246
parent 4619125bd337d259c0dc9f958d0102adc99d2543
author XiaoPeng Li <sweeper1203@gmail.com> 1763131240 +0800
committer GN LUCI <gn-scoped@luci-project-accounts.iam.gserviceaccount.com> 1764081792 -0800

Support weak_libraries

Sometimes we need to link to libraries that are only supported in newer versions of macOS,
or symbols that only exist in newer versions of macOS. The `-weak_library` linking parameter
can help us achieve this. When a library file or symbol is missing, dyld will bind the symbol
to NULL (instead of immediately exiting the program), allowing the application to determine
at runtime whether to use the new feature.

Related to https://gn-review.googlesource.com/c/gn/+/6660

Unlike -weak_framework, -weak_library requires a library file path, not
a name.

Reference: https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html
Change-Id: I6fa09f798108a805456b2def6d2edc56d36d100b
Reviewed-on: https://gn-review.googlesource.com/c/gn/+/20320
Commit-Queue: Takuto Ikuta <tikuta@google.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@google.com>