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

[Eric Blake]

On 12/15/2017 09:06 AM, Marc-André Lureau wrote:
> $ 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 <address@hidden>
> Reviewed-by: Eric Blake <address@hidden>
> ---
>  Makefile                    |  5 ++++-
>  docs/devel/build-system.txt | 13 +++++++++++++
>  2 files changed, 17 insertions(+), 1 deletion(-)

> +++ 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.

Except that this patch forgot to tweak 'make help' to mention 'make
print-VAR' ;)

> +
> +- print-VAR
> +
> +  Print the value of the variable VAR. Useful for debugging the build
> +  system.
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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