Here you can download the latest public release of MLton, version 20210117.
Changes since MLton 20201002
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Compiler.
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Fix bug in SimplifyTypes SSA optimization pass.
 
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Libraries.
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Other libraries.
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Updated: ckit library, MLLPT library, MLRISC library, SML/NJ library
 
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Other.
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Preliminary support for arm64-darwin.
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Fix bug in Makefile.binary detecting default position-independent style.
 
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For a complete list of changes and bug fixes since Release20201002, see the CHANGELOG.adoc and Bugs20201002.
20210117 binary packages
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AMD64 (aka "x86-64" or "x64")
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Darwin (.tgz) 19.6 (Mac OS X Catalina), dynamically linked against GMP in /usr/local/lib (suitable for Homebrew install of GMP)
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Darwin (.tgz) 19.6 (Mac OS X Catalina), statically linked against GMP (but requires GMP for generated executables)
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Linux (.tgz), glibc 2.31 (Ubuntu 20.04)
 
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20210117 source packages
Also see
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A snapshot of the MLton website at the time of release.