rust: run rust-is-available on build

This should make the warnings more visible without having to
run `rustavailable` manually.

If it turns out to be too annoying, we can remove it later on.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

Makefile

@@ -1269,6 +1269,7 @@ prepare0: archprepare
 	$(Q)$(MAKE) $(build)=scripts/mod
 	$(Q)$(MAKE) $(build)=.
 ifdef CONFIG_RUST
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust-is-available.sh -v
 	$(Q)$(MAKE) $(build)=rust
 endif
 
@@ -1786,7 +1787,7 @@ $(DOC_TARGETS):
 # "Is Rust available?" target
 PHONY += rustavailable
 rustavailable:
-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust-is-available.sh -v
+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust-is-available.sh -v && echo >&2 "Rust is available!"
 
 # Documentation target
 #

scripts/rust-is-available.sh

@@ -157,8 +157,3 @@ if [ ! -e "$rustc_src_core" ]; then
 	fi
 	exit 1
 fi
-
-# Success!
-if [ "$1" = -v ]; then
-	echo >&2 "Rust is available!"
-fi