[Qemu-devel] [PATCH v2 03/13] build-sys: add a rule to print a variable

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

$ 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>
---
 Makefile                    |  5 ++++-
 docs/devel/build-system.txt | 13 +++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 199f39fde1..46bc61004d 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,10 @@ BUILD_DIR=$(CURDIR)
 # Before including a proper config-host.mak, assume we are in the source tree
 SRC_PATH=.
 
-UNCHECKED_GOALS := %clean TAGS cscope ctags docker docker-% help
+UNCHECKED_GOALS := %clean TAGS cscope ctags docker docker-% help print-%
+
+print-%:
+	@echo '$*=$($*)'
 
 # All following code might depend on configuration variables
 ifneq ($(wildcard config-host.mak),)
diff --git a/docs/devel/build-system.txt b/docs/devel/build-system.txt
index 386ef36ee3..52501f2ad9 100644
--- a/docs/devel/build-system.txt
+++ b/docs/devel/build-system.txt
@@ -510,3 +510,16 @@ default-configs/$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.
-- 
2.15.1.355.g36791d7216