[Buildroot] [PATCH] toolchain/helpers: make sure we bail out when kernel headers check fails

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

In commit 6136765b23abd9faba610dd54ed276a777811575 ("toolchain:
generate check-headers program under $(BUILD_DIR)"), the
check_kernel_headers_version function was simplified to not check the
return value of the check-kernel-headers.sh script, assuming that
"make" does bail out on the first failing command.

However, check_kernel_headers_version when used in $(2)_CONFIGURE_CMDS
from pkg-toolchain-external.mk, is called in a sequence of commands,
where the return value of each command is not checked. Therefore, a
failure of check-kernel-headers.sh no longer aborts the build.

Since all other macros are using this principle of calling "exit 1",
we revert back to the same for check_kernel_headers_version, as it was
done prior to 6136765b23abd9faba610dd54ed276a777811575.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Carlos Santos <unixmania@gmail.com>
---
 toolchain/helpers.mk | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/toolchain/helpers.mk b/toolchain/helpers.mk
index 42e5522060..996cc70d44 100644
--- a/toolchain/helpers.mk
+++ b/toolchain/helpers.mk
@@ -163,7 +163,9 @@ copy_toolchain_sysroot = \
 # $3: kernel version string, in the form: X.Y
 #
 check_kernel_headers_version = \
-	support/scripts/check-kernel-headers.sh $(1) $(2) $(3)
+	if ! support/scripts/check-kernel-headers.sh $(1) $(2) $(3); then \
+		exit 1; \
+	fi
 
 #
 # Check the specific gcc version actually matches the version in the
-- 
2.23.0