Release 3.8, 2020-11-16

New features

Support _Static_assert from ISO C11.
Support __builtin_constant_p from GCC and Clang.
New port: x86 64 bits Windows with the Cygwin 64 environment. (configure with target x86_64-cygwin).
The following built-in functions are now available for all ports: __builtin_sqrt, __builtin_fabsf, and all variants of __builtin_clz and __builtin_ctz.
Added __builtin_fmin and __builtin_fmax for AArch64.

Simpler translation of CompCert C casts used for their effects but not for their values.
Known builtins whose results are unused are eliminated earlier.
Improved error reporting for ++ and -- applied to pointers to incomplete types.
Improved error reporting for redefinitions and implicit definitions of built-in functions.
Added formal semantics for some PowerPC built-ins.

New -canonical-idents mode, selected by default, to change the way C identifiers are encoded as CompCert idents (positive numbers). In -canonical-idents mode, a fixed one-to-one encoding is used so that the same identifier occurring in different compilation units encodes to the same number.
The -short-idents flag restores the previous encoding where C identifiers are consecutively numbered in order of appearance, causing the same identifier to have different numbers in different compilation units.
Removed the automatic translation of annotation builtins to Coq logical assertions, which was never used and possibly confusing.

Compatibility with Coq 8.12.1, 8.12.0, 8.11.2, 8.11.1.
Can use already-installed Flocq and MenhirLib libraries instead of their local copies (options -use-external-Flocq and -use-external-MenhirLib to the configure script).
Automatically build to OCaml bytecode on platforms where OCaml native-code compilation is not available.
Install the compcert.config summary of configuration choices in the same directory as the Coq development.
Updated the list of dual-licensed source files.