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-rw-r--r--Makefile14
1 files changed, 12 insertions, 2 deletions
diff --git a/Makefile b/Makefile
index 185ce47d6734..a0376430da20 100644
--- a/Makefile
+++ b/Makefile
@@ -581,7 +581,7 @@ endif
# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
# and from include/config/auto.conf.cmd to detect the compiler upgrade.
-CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
+CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
ifneq ($(CROSS_COMPILE),)
@@ -1739,6 +1739,16 @@ clean-dirs := $(KBUILD_EXTMOD)
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
$(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
+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)" != $(CONFIG_CC_VERSION_TEXT) ]; then \
+ echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
+ echo >&2 " The kernel was built by: "$(CONFIG_CC_VERSION_TEXT); \
+ echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
+ fi
+
PHONY += help
help:
@echo ' Building external modules.'
@@ -1750,7 +1760,7 @@ help:
@echo ''
# no-op for external module builds
-PHONY += prepare modules_prepare
+PHONY += modules_prepare
endif # KBUILD_EXTMOD