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System library build of Julia master fails on ARM macOS #44435

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@fxcoudert

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We're trying to build Julia 1.7.2 in Homebrew (Homebrew/homebrew-core#96194) but it has several failures. The first one is this:

System library symlink failure: Unable to locate libgcc_s.1.dylib on your system!

On ARM macOS, using the GCC branch from Iain Sandoe (https://github.com/iains/gcc-darwin-arm64), the name for the libgcc_s library should be libgcc_s.1.1.dylib: version is 1.1, not 1, and not 2, as is in master:

julia/Make.inc

Line 1477 in fb4118a

LIBGCC_NAME := libgcc_s.2.$(SHLIB_EXT)

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    system:apple siliconAffects Apple Silicon only (Darwin/ARM64) - e.g. M1 and other M-series chips

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