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

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

--- Comment #12 from Mark Millard <marklmi26-fbsd@yahoo.com> ---
(In reply to Lorenzo Salvadore from comment #11)

FreeBSD's port build servers are not used for native
armv7 or armv6 build activity: qemu is used instead.
lang/gcc* have the issue that the after the system
clang built stage, the rest of the stages no longer
use system clang to cross compile: just qemu.

(armv7 and armv6 also have address space limitations
in contexts were the hardware can directly execute
the code, not that official builds use such hardware.)

LTO_BOOTSTRAP based builds targeting for armv7/armv6
never worked on those builders as I understand. The
disabling of LTO_BOOTSTRAP style for armv7/armv6 was to
allow the FreeBSD servers to finally manage to build
the lang/gcc* armv7/armv6 ports that had tried to use
LTO_BOOTSTRAP for armv7/armv6.

(There is more to the story for what alternative was
selected as I understand, but that is not relevant
here.)

As always, the default OPTIONS are the definition of
what the official port build servers build --and those
definitions are not based on what people who choose to
do their own builds select for OPTIONS. (Note: I
build my own.) The OPTIONS allow avoiding the LTO
bootstrap. (And I do avoid LTO_BOOTSTRAP .)

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