Understanding and fixing cross-compilation requirements

" summary

Explains common cross-compilation problems that prevent FOSS projects from building for embedded GNU/Linux (ARM, MIPS, PowerPC) and shows concrete best practices to make build systems cross-compile friendly. Covers pitfalls in build scripts and dependency discovery used by projects written in statically compiled languages like C/C++, and offers fixes relevant to embedded build environments such as OpenEmbedded, OpenWRT and T2 SDE.

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