[U-Boot] [PATCH 3/3] arm: Warn that starting with v2018.01 gcc-6 or later is required

[Tom Rini]

There are more and more cases where if we do not use gcc-6.0 or later we
run into problems where our binaries are too large for the targets.
Given the prevalence of gcc-6.0 or later toolchains at this point in
time, we give notice now that starting with v2018.01 we will require
gcc-6 (or later) for ARM.

Signed-off-by: Tom Rini <trini at konsulko.com>
---
 arch/arm/config.mk | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm/config.mk b/arch/arm/config.mk
index 907c69371b94..9d305e1f4448 100644
--- a/arch/arm/config.mk
+++ b/arch/arm/config.mk
@@ -45,7 +45,14 @@ endif
 
 # Only test once
 ifeq ($(CONFIG_$(SPL_)SYS_THUMB_BUILD),y)
-archprepare: checkthumb
+archprepare: checkthumb checkgcc6
+
+checkgcc6:
+	@if test "$(call cc-name)" = "gcc" -a \
+			"$(call cc-version)" -lt "0600"; then \
+		echo -n '*** Your GCC is older than 6.0 and will not be '; \
+		echo 'supported starting with v2018.01.'; \
+	fi
 
 checkthumb:
 	@if test "$(call cc-name)" = "gcc" -a \
-- 
1.9.1