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Rebuilding arm-gnu-toolchain-12.3.rel1 from sources

Where can I find the top-level build scripts used to produce the binary toolchains?

I cloned the latest ABE and downloaded the manifests and the script, but I can't build a 100% equivalent toolchain. In particular, the various newlib variants seem to be built with different cflags, leading to larger static binaries.

I found other minor differences caused by configure finding (or not finding) optional dependencies. Would be good to specify the exact build environment used by, for example by publishing a Dockerfile or a VM image.