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build: preserves symbols during LTO with macOS linker
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man ld -export_dynamic:

```
Preserves all global symbols in main executables during LTO.

Without this option, Link Time Optimization is allowed to inline
and remove global functions.

This option is used when a main executable may load a plug-in which
requires certain symbols from the main executable.
```

Bug: vercel/pkg#1155
Signed-off-by: Jesse Chan <jc@linux.com>

PR-URL: #39839
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
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jesec authored and richardlau committed Sep 10, 2021
1 parent 97f3072 commit 22a78a7
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'OTHER_LDFLAGS': [ '-Wl,-rpath,@loader_path', ],
},
}],
[ 'enable_lto=="true"', {
'xcode_settings': {
'OTHER_LDFLAGS': [
# man ld -export_dynamic:
# Preserves all global symbols in main executables during LTO.
# Without this option, Link Time Optimization is allowed to
# inline and remove global functions. This option is used when
# a main executable may load a plug-in which requires certain
# symbols from the main executable.
'-Wl,-export_dynamic',
],
},
}],
['OS=="win"', {
'libraries': [
'Dbghelp.lib',
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