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From: Ben Hutchings <benh@debian.org>
Date: Thu, 15 Sep 2022 02:14:03 +0200
Subject: Makefile: Make compiler version comparison optional
Forwarded: not-needed
Bug-Debian: https://bugs.debian.org/1019749
The top-level Makefile warns if the compiler version string changes at
all between the kernel build and an out-of-tree module build.
We expect that major compiler version changes could introduce ABI
changes, and override the CC variable in out-of-tree module builds to
ensure that the same major compiler version is used. But minor
version changes should not make a difference, so this exact version
comparison produces false warnings.
Since custom kernel packages don't have that, don't remove the version
comparison. Instead, skip it if $(DEBIAN_KERNEL_NO_CC_VERSION_CHECK)
is non-empty.
---
--- a/Makefile
+++ b/Makefile
@@ -1753,7 +1753,7 @@ PHONY += prepare
# now expand this into a simple variable to reduce the cost of shell evaluations
prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
prepare:
- @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
+ @if [ -z "$(DEBIAN_KERNEL_NO_CC_VERSION_CHECK)" ] && [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
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