[Bug 264949] lang/gcc11: Needs build time warning for /tmp consumption

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264949

            Bug ID: 264949
           Summary: lang/gcc11: Needs build time warning for /tmp
                    consumption
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: toolchain@FreeBSD.org
          Reporter: junchoon@dec.sakura.ne.jp
          Assignee: toolchain@FreeBSD.org
             Flags: maintainer-feedback?(toolchain@FreeBSD.org)

lang/gcc11 is now the default version of gcc at ports git
cad2f66a384d74cffa870d978722e6fd579c7d2f.

On updating, build exhausted by insufficient capacity of /tmp.
At the moment, I had 2GiB of tmpfs for /tmp, backed with 32GiB swap.

stable13 at git dac438a9b599cfec13b463a1a8d90283f7ed830f, amd64.


By increasing /tmp with 1GiB step (with reboots), finally build finished
successfully with 5GiB of/tmp. (4GiB was insufficient.)

I'm not sure this is really reasonable for just a toolchain though, at least,
this SHALL be warned like www/chromium does on pre-everything:: target does.

Is this because of LTO_BOOTSTRAP option (default of amd64)?


Note that /tmp was used only 1.7MiB after building lang/gcc11 finished
and lang/gcc10 with default option was OK with 2GiB of /tmp.

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