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loader: make sure CPUTYPE is ignored when building

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CPUTYPE?=native causes -march=native to be added to the command
line. When the host machine is haswell, this causes some versions of
clang to generate code that can't execute in the efi boot loader
environment. Set _CPUCFLAGS= to undo what's done bsd.cpu.mk. bsd.cpu.mk
is included too early to control with NO_CPU_CFLAGS here. The only other
option is to put that in all the Makefiles, and this is less tedious and
error prone.

PR:			194641
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D31187
MFC After:		1 week
This commit is contained in:
Warner Losh 2021-07-14 21:06:08 -06:00
parent 4211457e40
commit 7a0c0ff7ee
1 changed files with 8 additions and 0 deletions
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8
stand/defs.mk
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@ -15,6 +15,14 @@ MAN=
NO_PIC=
INTERNALLIB=
.endif
# Should be NO_CPU_FLAGS, but bsd.cpu.mk is included too early in bsd.init.mk
# via the early include of bsd.opts.mk. Moving Makefile.inc include earlier in
# that file causes weirdness, so this is the next best thing. We need to do this
# because the loader needs very specific flags to work right, and things like
# CPUTYPE?=native prevent that, and introduce an endless game of whack-a-mole
# to disable more and more features. Boot loader performance is never improved
# enough to make that hassle worth chasing.
_CPUCFLAGS=
.include <src.opts.mk>
.include <bsd.linker.mk>