[Bug debug/86964] Too many debug symbols included, especially for extern globals

[patrickdepinguin at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86964

--- Comment #4 from Thomas De Schampheleire <patrickdepinguin at gmail dot com> ---
I am suffering from this same problem using gcc 7.3.0 on a Broadcom SDK.
Due to this, compiled object files increase from 90 KiB (using gcc 4.9.2) to 15
MiB (gcc 7.3.0). This size increase is enormous.

Aside from the fact that the disk space need becomes very large (don't know the
total number, but it is definitely larger than 32 GiB), the final link step
actually failed due to it.