[ptxdist] [PATCH] tf-a: stop defining AS and other variables in cross make env

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

The MAKE_ENV incantation results in PTXdist defining variables like AS
and LD that point at the respective tools in the cross toolchain.

This was unneeded as we already supply the TF-A built with a
CROSS_COMPILE option, which is used to derive the correct tools, but it
didn't hurt.

This will expectedly change with TF-A v2.11, which should merge commit
cc277de81692 ("build: refactor toolchain detection"), currently sitting
in the integration branch.

This changes the default value of AS to be that of the C compiler and
leads to various issues when overriding it with an assembler as was
possible before, e.g.:

  - hang during tool discovery, because `as -v` keeps waiting for input,
    unlike gcc -v

  - Assembler errors during build, because GCC-specific options (e.g.
    -DMACRO=VAL) are now passed to as(1).

While TF-A changing the semantics of the AS option is arguably
strange[2], let's take the easy way out and stop setting AS, so the PTXdist
rule can build both old and new TF-A without problems.

[1]: https://github.com/ARM-software/arm-trusted-firmware/commit/cc277de8169
[2]: https://review.trustedfirmware.org/c/TF-A/trusted-firmware-a/+/27163

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 rules/tf-a.make | 2 --
 1 file changed, 2 deletions(-)

diff --git a/rules/tf-a.make b/rules/tf-a.make
index 54fe7d1e37d8..b8c477476c74 100644
--- a/rules/tf-a.make
+++ b/rules/tf-a.make
@@ -74,8 +74,6 @@ TF_A_CONF_TOOL	:= NO
 # Compile
 # ----------------------------------------------------------------------------
 
-TF_A_MAKE_ENV	:= $(CROSS_ENV)
-
 $(STATEDIR)/tf-a.compile:
 	@$(call targetinfo)
 
-- 
2.39.2