Bug#972736: FTBFS Mesa 20.2.x fails to build on x32 (debian\rules issue)

[Witold Baryluk <witold.baryluk@gmail.com>]

Source: mesa
Followup-For: Bug #972736
X-Debbugs-Cc: witold.baryluk@gmail.com

I think a better approach, would be to use a trailing comms in the list

"-Dvulkan-drivers=['amd','swrast',]"

Does work. So doing:

VULKAN_DRIVERS += 'intel',

"-Dvulkan-drivers=[$(VULKAN_DRIVERS)]"

would probably work. It requires each element of the list to be single quotes.



Even nicer is just to use some Makefile magic, to convert list of words
into ones with single quotes, then to convert spaces into commas.

VULKAN_DRIVERS += amd
VULKAN_DRIVERS += intel
VULKAN_DRIVERS += swrast

empty:=
space := $(empty) $(empty)
comma := ,
VULKAN_DRIVERS := $(patsubst %,'%',$(VULKAN_DRIVERS))
VULKAN_DRIVERS_LIST := $(subst $(space),$(comma),$(VULKAN_DRIVERS))

test:
	echo "[$(VULKAN_DRIVERS_LIST)]"


$ make -s test
['amd','intel','swrast']
$

for empty list it give me this:
$ make -s test
[]
$

Sweet!

Maybe there is some shared function for Debian rules that already
implement this for reuse.


Cheers,
Witold