Change Details

``` Note that this does not _enable_ lto by default in any way, only hooks up the machinery for -flto to work correctly. enable-lto-support is explicitly used for pinned-clang because we know it works. It is neither enabled nor disabled in the external clang case so that it can be auto-detected. ``` Backport of core PR19530.

``` Note that this does not _enable_ lto by default in any way, only hooks up the machinery for -flto to work correctly. enable-lto-support is explicitly used for pinned-clang because we know it works. It is neither enabled nor disabled in the external clang case so that it can be auto-detected. ``` Backport of core [[https://github.com/bitcoin/bitcoin/pull/19530 | PR19530]].

``` Note that this does not _enable_ lto by default in any way, only hooks up the machinery for -flto to work correctly. enable-lto-support is explicitly used for pinned-clang because we know it works. It is neither enabled nor disabled in the external clang case so that it can be auto-detected. ``` Backport of core [[https://github.com/bitcoin/bitcoin/pull/19530 | PR19530]].