[Buildroot] [PATCH 1/2] package/irrlicht: fix libraries linking

[Yann E. MORIN]

Bartosz, All,

On 2020-06-21 15:10 +0200, Bartosz Bilas spake thusly:
> Fixes:
>  /home/bartekk/buildroot/output/host/opt/ext-toolchain/bin/../lib/gcc/arm-buildroot-linux-gnueabihf/9.2.0/../../../../arm-buildroot-linux-gnueabihf/bin/ld: /home/bartekk/buildroot/output/host/arm-buildroot-linux-gnueabihf/sysroot/usr/lib/libIrrlicht.so: undefined reference to `XSetSelectionOwner'
[--SNIP--]
> Signed-off-by: Bartosz Bilas <b.bilas at grinn-global.com>
[--SNIP--]
> +diff --git a/source/Irrlicht/Makefile b/source/Irrlicht/Makefile
> +index 9a1bdbc..85eb264 100644
> +--- a/source/Irrlicht/Makefile
> ++++ b/source/Irrlicht/Makefile
> +@@ -88,7 +88,7 @@ STATIC_LIB = libIrrlicht.a
> + LIB_PATH = ../../lib/$(SYSTEM)
> + INSTALL_DIR = /usr/local/lib
> + sharedlib install: SHARED_LIB = libIrrlicht.so
> +-sharedlib: LDFLAGS += -L/usr/X11R6/lib$(LIBSELECT) -lGL -lXxf86vm
> ++sharedlib: override LDFLAGS += -L/usr/X11R6/lib$(LIBSELECT) -lGL -lXxf86vm

That's definitely incorrect: we do not want to use a library path that
points to the host system libraries.

I wonder why our paranoid wrapper does not catches that... :-/
So far, it would not catch it, because the LDFLAGS are from the command
line, so the -L/usr/X11R6/lib is not used. But with your patch, it would
be used now...

> + staticlib sharedlib: CXXINCS += -I/usr/X11R6/include

Ditto, we do not want to use include paths that points to the host
system headers.

Ah, I got it now: the wrapper only checks for a select list of known
host paths, but neither /usr/X11R6/include nor /usr/X11R6/lib are in
that list...

But now I see that your second patch does fix that for the linker, but
that's not our paranoid wrapper doing the check, but really the
cross linker ld.

Sigh... We need to expand our wrapper with those two paths...

Anyway: you should merge the two patches together into a single one, and
explain the above in thecommit log.

Also, could you investigate removing the CXXINCS += -I/usr/X11R6/include
line too? Normally, we should have the proper search paths already.

Oh, and one last point: in a post-commit message (after the --- line),
add a note that irrlicht uses CRLF line endings, and that the patch
will have to be fixed when applying, because patchwork drops all the
CR and keeps on LF.

Care to respin, please?

In the meantime, I'll send a patch to extend the list of unsafe paths in
our toolchain wrapper...

Thanks! :-)

Regards,
Yann E. MORIN.

> + #OSX specific options
> +-- 
> +2.27.0
> +
> diff --git a/package/irrlicht/irrlicht.mk b/package/irrlicht/irrlicht.mk
> index bd82815cde..e12d802ee7 100644
> --- a/package/irrlicht/irrlicht.mk
> +++ b/package/irrlicht/irrlicht.mk
> @@ -38,12 +38,14 @@ ifeq ($(BR2_STATIC_LIBS),)
>  IRRLICHT_CONF_OPTS += sharedlib
>  endif
>  
> +# set correct path for libraries linking
> +IRRLICHT_CONF_OPTS += LDFLAGS="$(TARGET_LDFLAGS) -L$(STAGING_DIR)/usr/lib"
>  # Irrlicht fail to detect properly the NEON support on aarch64 or ARM with NEON FPU support.
>  # While linking an application with libIrrlicht.so, we get an undefined reference to
>  # png_init_filter_functions_neon.
>  # Some files are missing in the libpng bundled in Irrlicht, in particular arm/arm_init.c,
>  # so disable NEON support completely.
> -IRRLICHT_CONF_OPTS += CPPFLAGS="$(TARGET_CPPFLAGS) -DPNG_ARM_NEON_OPT=0"
> +IRRLICHT_CONF_OPTS += CPPFLAGS="$(TARGET_CPPFLAGS) -DPNG_ARM_NEON_OPT=0 -I$(STAGING_DIR)/usr/include/X11"
>  
>  define IRRLICHT_BUILD_CMDS
>  	$(TARGET_MAKE_ENV)
> -- 
> 2.27.0
> 
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