[Caml-list] OCaml 4.13.0, first release candidate

[Florian Angeletti <florian.angeletti@inria.fr>]

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Dear OCaml users, 

The release of OCaml 4.13.0 is imminent. 
As a last test that everything is in order, we are publishing a first release 
candidate for OCaml 4.13.0. 

Compared to the last beta release, this release candidate includes one small fix 
for flambda, another for the compiler-libs, one regression fix when compiling C 
files with ocamlc or ocamlopt, and a handful of configuration and build system 
improvements (in particular on Windows). See the changelog below for more details. 

If you find any bugs, please report them here: 

https://github.com/ocaml/ocaml/issues 

The release of OCaml 4.13.0 is currently planned for mid-September. 
(An assembler generation bug was discovered this morning, we might release 
another release candidate next week once this bug is fixed.) 

Happy hacking, 
Florian Angeletti for the OCaml team. 

Installation instructions 
---------------------------- 
The base compiler can be installed as an opam switch with the following commands 

opam update 
opam switch create 4.13.0~rc1 --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git 

If you want to tweak the configuration of the compiler, you can switch to the option variant with: 

opam update 
opam switch create <switch_name> --packages=ocaml-variants.4.13.0~rc1+options,<option_list> --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git 

where <option_list> is a comma separated list of ocaml-option-* packages. For instance, for a flambda and no-flat-float-array switch: 

opam switch create 4.13.0~rc1+flambda+nffa --packages=ocaml-variants.4.13.0~rc1+options,ocaml-option-flambda,ocaml-option-no-flat-float-array --repositories=default,beta=git+https://github.com/ocaml/ocaml-beta-repository.git 

All available options can be listed with "opam search ocaml-option". 

The source code for the beta release is also available at these addresses: 

https://github.com/ocaml/ocaml/archive/4.13.0-rc1.tar.gz 
https://caml.inria.fr/pub/distrib/ocaml-4.13/ocaml-4.13.0~rc1.tar.gz 

Changes since the first beta 
---------------------------- 

## Bug fixes 

- #10593: Fix untyping of patterns without named existential quantifiers. This 
bug was only present in the beta version of OCaml 4.13.0. 
(Ulysse Gérard, review by Florian Angeletti) 

- #10603, #10611: Fix if condition marked as inconstant in flambda 
(Vincent Laviron and Pierre Chambart, report by Marcello Seri) 

## Regression fix 

+ #9960, #10619(new in rc1): extend ocamlc/ocamlopt's -o option to work when 
compiling C files 
(Sébastien Hinderer, reported by Daniel Bünzli, review by 
Florian Angeletti and Gabriel Scherer) 

## Internal configuration and build system 

- #10471: Fix detection of arm32 architectures with musl in configure. 
(Louis Gesbert, review by David Allsopp) 

- #10451: Replace the use of iconv with a C utility to convert $(LIBDIR) to a 
C string constant on Windows when building the runtime. Hardens the generation 
of the constant on Unix for paths with backslashes, double-quotes and 
newlines. 
(David Allsopp, review by Florian Angeletti and Sébastien Hinderer) 

- #10511: Cygwin ports now correctly configure when flexdll is not available. 
(David Allsopp, review by Florian Angeletti) 

- #10584, #10856: Standard Library documentation build no longer fails if 
optional libraries have been disabled. 
(David Allsopp, report by Yuri Victorovich review by Florian Angeletti) 

## Manual 

- #10605: manual, name few css classes to ease styling and maintainability. 
(Florian Angeletti, review by Wiktor Kuchta and Gabriel Scherer) 

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