Cross compilation issues Qt + libmatrix_creator_hal

[X-Krys]

Hi,

I'm trying to cross compile an application that use both Qt and matrix_creator_hal libs.

My environment is:

• Qt 5.12
• host: Intel (x86_64) on Ubuntu 17.10
• target: Raspberry Pi (armv7l) on Raspbian Stretch 9.6
• IDE: Qt Creator 4.8

I did setup my toolchain on Qt Creator along with a Kit with sysroot set.

I can successfully cross compile Qt only apps but when I link to matrix_creator_hal lib I get theses errors during link:

[...]/sysroot/usr/lib/libmatrix_creator_hal.so: undefined reference to `typeinfo for std::thread::_State@GLIBCXX_3.4.22'

My pro file contain this line:

LIBS += -lmatrix_creator_hal

Any ideas how to fix this?

Thanks

[kshegunov]

@X-Krys said in Cross compilation issues Qt + libmatrix_creator_hal:

I can successfully cross compile Qt only apps but when I link to matrix_creator_hal lib I get theses errors during link:

libmatrix_creator_hal.so comes from? The package manager? This looks like a version/compiler mismatch error. Make sure the standard library (libstdc++) used for libmatrix_creator_hal.so is the same as the one you have when linking. Compilers must be producing binary compatible code, naturally.

[X-Krys]

@kshegunov Yes libmatrix_creator_hal comes from the package manager

Ok so ldd on libmatrix_creator_hal gives me:

libstdc++.so.6 => /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 (0x76bc3000)

On the other side my compiler is gcc version 4.8.3 20140303 (prerelease) (crosstool-NG linaro-1.13.1+bzr2650 - Linaro GCC 2014.03)

So it means I should use GCC 6 to match the compiler that lib has been built with ?

[kshegunov]

@X-Krys said in Cross compilation issues Qt + libmatrix_creator_hal:

So it means I should use GCC 6 to match the compiler that lib has been built with ?

6 is the library version, so you should use the same major version of the stdc++ (assuming they keep binary compatibility, which I'm not sure about). Also you need to use a compiler that produces code that is binary compatible with the compiler used to build that library, unfortunately I have no clue which version is that exactly, but I really doubt it's as old as gcc 4.8.3.