Hi,
After compiling a package with GCC 6, I noticed the following error,
which is a known issue:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70129
The problem is caused by adding -isystem /usr/include, which breaks the
GCC 6's #include_next. I see that Khem Raj already removed this for the
nativesdk [1], but it seems we need a similar fix for other packages, as
we are still adding -isystem in meta/conf/bitbake.conf:
[snip]
BUILDSDK_CPPFLAGS = "-isystem${STAGING_INCDIR}"
[snip]
I experimented with a few options:
- Changing this to "-I${STAGING_INCDIR}". Although this works (and the
poky repo will recompile with it), I believe it will break when a recipe
does -Wall -Werror and hits an error in the standard include files
(-isystem specifically ignores warnings for this reason.)
- Changing this to just "". This breaks at least pbzip2-native, which
can no longer find bzlib.h, since it uses the system g++ to do so and
bzlib-dev is not installed.
I'm guessing the right solution involves passing a --sysroot option to
the native build instead of -isystem so that the builtin gcc/g++
/usr/include will find the right files.
Does this sound right, or do you have other ideas?
Thanks,
Martin
[1] poky 54d06c080393785270313878bc4a15a9915571ba
https://patchwork.openembedded.org/patch/122285/
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