svn commit: r364924 - head/stand

[Warner Losh]

Author: imp
Date: Fri Aug 28 17:36:14 2020
New Revision: 364924
URL: https://svnweb.freebsd.org/changeset/base/364924

Log:
  Create CFLAGS_EARLY.file for boot loader.
  
  Some external code requires a specific set of include paths to work
  properly since it emulates the typical environment the code is used
  in. Enable this by creating a CFLAGS_EARLY.file variable that can be
  used to build this stack. Otherwise the include stack we build for
  stand programs may get in the way. Code that uses this feature has to
  tolerate the normal stack of inclues being last on the list (and
  presumably unused), though.
  
  Generally, it it should only be used for the specific include
  directories. Defines and that sort of thing should be done in the
  normal CFLAGS variable. There is a global CFLAGS_EARY hook as well for
  everything in a Makefile.

Modified:
  head/stand/defs.mk

Modified: head/stand/defs.mk
==============================================================================
--- head/stand/defs.mk	Fri Aug 28 17:06:35 2020	(r364923)
+++ head/stand/defs.mk	Fri Aug 28 17:36:14 2020	(r364924)
@@ -55,6 +55,11 @@ LIBSA32=	${BOOTOBJ}/libsa32/libsa32.a
 
 # Standard options:
 CFLAGS+=	-nostdinc
+# Allow CFLAGS_EARLY.file/target so that code that needs specific stack
+# of include paths can set them up before our include paths. Normally
+# the only thing that should be there are -I directives, and as few of
+# those as possible.
+CFLAGS+=	${CFLAGS_EARLY} ${CFLAGS_EARLY.${.IMPSRC:T}} ${CFLAGS_EARLY.${.TARGET:T}}
 .if ${MACHINE_ARCH} == "amd64" && ${DO32:U0} == 1
 CFLAGS+=	-I${BOOTOBJ}/libsa32
 .else