[Buildroot] [PATCH 1/1] package/swupdate: fix static build without lua

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello Fabrice,

On Mon,  4 Mar 2019 22:47:20 +0100
Fabrice Fontaine <fontaine.fabrice@gmail.com> wrote:

> diff --git a/package/swupdate/0001-Makefile-fix-static-build.patch b/package/swupdate/0001-Makefile-fix-static-build.patch
> new file mode 100644
> index 0000000000..56901f9871
> --- /dev/null
> +++ b/package/swupdate/0001-Makefile-fix-static-build.patch
> @@ -0,0 +1,62 @@
> +From 15a324f8c67548f219256a5a75ba8123cc5bdac6 Mon Sep 17 00:00:00 2001
> +From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> +Date: Mon, 4 Mar 2019 21:51:36 +0100
> +Subject: [PATCH] Makefile: fix static build
> +
> +Don't build and install lua_swupdate.so if HAVE_LUA isn't set to y
> +otherwise build will fail if the toolchain only suports building static
> +libraries
> +
> +Fixes:
> + - http://autobuild.buildroot.org/results/c11c4d26983e0347d96f3dda62e6d72b031967bb
> +
> +Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
> +[Upstream status: https://github.com/sbabic/swupdate/pull/49]
> +---
> + Makefile | 12 +++++++++---
> + 1 file changed, 9 insertions(+), 3 deletions(-)
> +
> +diff --git a/Makefile b/Makefile
> +index cfeb9a6..cac99b5 100644
> +--- a/Makefile
> ++++ b/Makefile
> +@@ -369,11 +369,15 @@ tools-bins	:= $(patsubst $(tools-y)/%.c,$(tools-y)/%,$(wildcard $(tools-y)/*.c))
> + tools-bins-unstr:= $(patsubst %,%_unstripped,$(tools-bins))
> + tools-all	:= $(tools-objs)
> + 
> ++ifeq ($(HAVE_LUA),y)
> ++lua_swupdate	:= lua_swupdate.so
> ++endif

I am a bit confused. How could lua_swupdate.so build at all (even in
shared library configurations) when HAVE_LUA is not enabled ?

I see the patch has been applied upstream, so I guess it is correct,
but still that confuses me a bit. Or maybe lua_swupdate.so doesn't link
with Lua ? 

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com