[Bug bootstrap/84257] Extremely slow compilation from gcc source code under macOS 10.13

[191919 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84257

--- Comment #2 from 191919 <191919 at gmail dot com> ---
I tried with the combination of the following settings under macOS 10.13.3:

internal SSD / external HD
HFS+ / APFS
SIP enabled / SIP disabled

The only factor that affects is SIP status. Once I disable it,
DYLD_LIBRARY_PATH will be exported, then the scripts run slowly.

I have reported the problem to Apple, but since turning off SIP is not
recommended, I don't think they are going to fix it in short future.