Commit de1da442 authored Jan 04, 2018 by Marc-André Lureau Committed by Paolo Bonzini Jan 12, 2018

build-sys: add a rule to print a variable

$ make print-CFLAGS
CFLAGS=-fsanitize=address -Og -g

Trick from various sources:
https://stackoverflow.com/questions/16467718/how-to-print-out-a-variable-in-makefile
https://www.cmcrossroads.com/article/printing-value-makefile-variable



Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20180104160523.22995-4-marcandre.lureau@redhat.com>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent 42a77f1c

Makefile

+4 −1

Original line number	Diff line number	Diff line
		@@ -8,9 +8,12 @@ SRC_PATH=.

		UNCHECKED_GOALS := %clean TAGS cscope ctags dist \
		html info pdf txt \
		help check-help \
		help check-help print-% \
		docker docker-% vm-test vm-build-%

		print-%:
		@echo '$=$($)'

		# All following code might depend on configuration variables
		ifneq ($(wildcard config-host.mak),)
		# Put the all: rule here so that config-host.mak can contain dependencies.

docs/devel/build-system.txt

+13 −0

Original line number	Diff line number	Diff line
		@@ -510,3 +510,16 @@ default-configs/$TARGET-NAME file as input.
		This is the entrypoint used when make recurses to build a single system
		or userspace emulator target. It is merely a symlink back to the
		Makefile.target in the top level.


		Useful make targets
		===================

		- help

		Print a help message for the most common build targets.

		- print-VAR

		Print the value of the variable VAR. Useful for debugging the build
		system.