Compiling C++ bindings with buildroot fails: ERROR: unsafe header/library path used in cross-compilation: '-L/usr/lib' about libgpiod

[brgl]

This isn't part of any release yet, it's still WIP. I will surely address any build issues before releasing 1.1.

[jktjkt]

Yeah, sure, I understand that. I just wanted to make myself known as an interested user, and to report back what I have. I'm very interested in C++ bindings because that would help me nuke some of my code :).

[brgl]

Cool, please don't hesitate to let me know should you find a solution before I do.

[jktjkt]

A small update -- at first, I was running ./autogen.sh, which also runs ./configure. That is obviously wrong. However, even just initializing the dir by running git clean -dxf; autoreconf --force --install --verbose doesn't change anything.

[brgl]

For buildroot, I'd advise to first run make dist from the repo, unpack the tarball somewhere and then use the local SITE_METHOD to fetch the packaged source.

[brgl]

@jktjkt interesting - I can't build the C++ bindings in buildroot either and am getting the same error, but the yocto SDK builds it fine. I guess there's something in the buildroot environment.

[heinemml]

Just a observation by me. In my Buildroot it compiles.

By comparison of the failing command I see that I'm not using the -fstack-protector-strong parameter.
So your ERROR is a WARNING in my build and runs through. Maybe this is the same reason why it works with yocto?

[heinemml]

Found this Buildroot issue, which pretty much resembles this problem: http://lists.busybox.net/pipermail/buildroot/2016-September/172127.html

In short: Buildroot requires a patched libtool to handle the different path for crosscompilation.
So with this libgpiod.mk I can build from the local git clone. (running autoreconf --force --install --verbose before building).

Note, this also adds the dependency on autoconf-archive for the host toolchain which is in the git version.

################################################################################
#
# libgpiod
#
################################################################################

LIBGPIOD_VERSION = 0.3.2
LIBGPIOD_SOURCE = libgpiod-$(LIBGPIOD_VERSION).tar.xz
LIBGPIOD_SITE = https://www.kernel.org/pub/software/libs/libgpiod
LIBGPIOD_LICENSE = LGPL-2.1+
LIBGPIOD_LICENSE_FILES = COPYING
LIBGPIOD_INSTALL_STAGING = YES
LIBGPIOD_AUTORECONF = YES
LIBGPIOD_AUTORECONF_OPTS += -I $(HOST_DIR)/usr/share/autoconf-archive

LIBGPIOD_DEPENDENCIES = host-pkgconf \
                        host-autoconf-archive

ifeq ($(BR2_PACKAGE_LIBGPIOD_TOOLS),y)
LIBGPIOD_CONF_OPTS += --enable-tools
else
LIBGPIOD_CONF_OPTS += --disable-tools
endif

ifeq ($(BR2_INSTALL_LIBSTDCPP),y)
LIBGPIOD_CONF_OPTS += --enable-bindings-cxx
endif

$(eval $(autotools-package))

[brgl]

@heinemml thanks! Can confirm - it builds for me with the two AUTORECONF options set.

[brgl]

Bindings are now built properly in buildroot and yocto.