# Illegal CPU instructions when testing GDAL.jl?

**URL:** <https://discourse.julialang.org/t/illegal-cpu-instructions-when-testing-gdal-jl/41922>\
**Category:** Geo\
**Created:** [June 23, 2020, 9:30am UTC](https://discourse.julialang.org/t/illegal-cpu-instructions-when-testing-gdal-jl/41922 "2020-06-23T09:30:50Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![visr](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/visr/32/17204_2.png) [@visr](https://discourse.julialang.org/u/visr)\
**Post date:** [June 26, 2020, 2:01pm UTC](https://discourse.julialang.org/t/illegal-cpu-instructions-when-testing-gdal-jl/41922/18 "2020-06-26T14:01:48Z")

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Too bad it seems to be hard to get this working. I’m not sure, but looking at the error you shared:

```julia
_ZNK5osgeo4proj2io21IPROJStringExportable18exportToPROJStringB5cxx11EPNS1_19PROJStringFormatterE at /home/c/.julia-usr/lib/libproj.so (unknown line)
proj_create_conversion at /home/c/.julia-usr/lib/libproj.so (unknown line)
_ZN19OGRSpatialReference9SetProjCSEPKc at /home/c/.julia-usr/lib/libgdal.so (unknown line)

```

My first guess was a mismatching CXX string ABI, that could still be something to try, see also [Error in building julia](https://discourse.julialang.org/t/error-in-building-julia/33272).

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