6.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miguel Ojeda ojeda@kernel.org
commit 1c4494c14b4124f3a13a7f4912b84b633ff4f9ba upstream.
GNU Make 4.3 changed the behavior of `#` inside commands in commit c6966b323811 ("[SV 20513] Un-escaped # are not comments in function invocations"):
* WARNING: Backward-incompatibility! Number signs (#) appearing inside a macro reference or function invocation no longer introduce comments and should not be escaped with backslashes: thus a call such as: foo := $(shell echo '#') is legal. Previously the number sign needed to be escaped, for example: foo := $(shell echo '#') Now this latter will resolve to "#". If you want to write makefiles portable to both versions, assign the number sign to a variable: H := # foo := $(shell echo '$H') This was claimed to be fixed in 3.81, but wasn't, for some reason. To detect this change search for 'nocomment' in the .FEATURES variable.
Unlike other commits in the kernel about this issue, such as commit 633174a7046e ("lib/raid6/test/Makefile: Use $(pound) instead of # for Make 4.3"), that fixed the issue for newer GNU Makes, in our case it was the opposite, i.e. we need to fix it for the older ones: someone building with e.g. 4.2.1 gets the following error:
scripts/Makefile.compiler:81: *** unterminated call to function 'call': missing ')'. Stop.
Thus use the existing variable to fix it.
Reported-by: moyi geek 1441339168@qq.com Closes: https://rust-for-linux.zulipchat.com/#narrow/channel/291565/topic/x/near/512... Cc: stable@vger.kernel.org Fixes: e72a076c620f ("kbuild: fix issues with rustc-option") Reviewed-by: Nicolas Schier nicolas@fjasle.eu Reviewed-by: Alice Ryhl aliceryhl@google.com Link: https://lore.kernel.org/r/20250414171241.2126137-1-ojeda@kernel.org Signed-off-by: Miguel Ojeda ojeda@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- scripts/Makefile.compiler | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/scripts/Makefile.compiler +++ b/scripts/Makefile.compiler @@ -75,7 +75,7 @@ ld-option = $(call try-run, $(LD) $(KBUI # Usage: MY_RUSTFLAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage) # TODO: remove RUSTC_BOOTSTRAP=1 when we raise the minimum GNU Make version to 4.4 __rustc-option = $(call try-run,\ - echo '#![allow(missing_docs)]#![feature(no_core)]#![no_core]' | RUSTC_BOOTSTRAP=1\ + echo '$(pound)![allow(missing_docs)]$(pound)![feature(no_core)]$(pound)![no_core]' | RUSTC_BOOTSTRAP=1\ $(1) --sysroot=/dev/null $(filter-out --sysroot=/dev/null --target=%,$(2)) $(3)\ --crate-type=rlib --out-dir=$(TMPOUT) --emit=obj=- - >/dev/null,$(3),$(4))