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build-sys: add a rule to print a variable

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$ 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>
This commit is contained in:
Marc-André Lureau 2018-01-04 17:05:08 +01:00 • committed by Paolo Bonzini
parent 42a77f1ce4
commit de1da442ea
2 changed files with 17 additions and 1 deletions
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13
docs/devel/build-system.txt
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@ -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.