[gentoo-user] Re: matplotlib build fails: link using /usr/lib instead of /usr/lib64

[Grant Edwards]

On 2020-05-27, Grant Edwards <grant.b.edwards@×××××.com> wrote:

> I tried to emerge matplotlib today, and it failed because it's linking
> in 32-bit libraries instead of 64 bit ones:
>
>     x86_64-pc-linux-gnu-g++ -shared -Wl,-O1 -Wl,--as-needed -march=native -O2 -pipe -fno-strict-aliasing -DNDEBUG /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/src/mplutils.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/src/py_converters.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/src/_backend_agg.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/src/_backend_agg_wrapper.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_bezier_arc.o /var/tmp/portage/dev-python
>  /matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_curves.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/bui
>  ld/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_image_filters.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_trans_affine.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_vcgen_contour.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_vcgen_dash.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_vcgen_stroke.o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/temp.linux-x86_64-3.7/extern/agg24-svn/src/agg_vpgen_seg
>  mentator.o -L/usr/lib -L/usr/lib64 -L/usr/lib64 -lfreetype -lpython3.7m -o /var/tmp/portage/dev-python/matplotlib-2.2.2-r1/work/matplotlib-2.2.2-python3_7/build/lib/matplotlib/backends/_backend_agg.
>  cpython-37m-x86_64-linux-gnu.so
>     /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libm.so when searching for -lm
>     /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libm.a when searching for -lm
>     /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libc.so when searching for -lc
>     /usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/../../../../x86_64-pc-linux-gnu/bin/ld: skipping incompatible /usr/lib/libc.a when searching for -lc
>     error: command 'x86_64-pc-linux-gnu-g++' failed with exit status 1

I think the linker warnings above are normal.

When I change MAKEOPTS from -j4 to -j1, it built OK.

I still saw a bunch of the "skipping incompatble <library>" messages.

--
Grant