docs: add AmigaOS release readme

docs/AMIGAOS.md

@@ -0,0 +1,124 @@
+<!--
+Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+
+SPDX-License-Identifier: curl
+-->
+
+# curl for AmigaOS
+
+This document describes the AmigaOS 3.x binary archive for curl 8.18.0-DEV
+and libcurl 8.18.0-DEV.
+
+```text
+curl 8.18.0-DEV
+-------------------------------------
+libcurl/8.18.0-DEV AmiSSL/5.x OpenSSL/3.6.0 zlib/1.3.1
+Protocols: dict file ftp ftps gopher gophers http https imap imaps
+           ipfs ipns mqtt pop3 pop3s rtsp smb smbs smtp smtps telnet
+           tftp ws wss
+Features:  alt-svc HSTS HTTPS-proxy libz NTLM SSL TLS-SRP threadsafe
+```
+
+curl is a command line tool for transferring data specified with URL syntax.
+The archive also includes libcurl, which allows Amiga developers to link curl
+functionality directly into their own applications.
+
+The AmigaOS archive is tested on multiple CPU targets and SSL workloads.
+
+## System requirements
+
+- AmiSSL v5.0 or newer (mandatory)
+- AmigaOS 3.x (3.2.2.1 tested, works on 3.0-3.1)
+- 68000, 68020, 68040, or 68060 CPU (no FPU required)
+- Minimum stack: 32768 bytes
+  - AmigaOS 3.1.4 and newer auto-select the correct stack
+  - Older versions: set it manually with `STACK 32768`
+- Roadshow TCP tested
+- WinUAE TCP tested
+- Real hardware and emulation tested
+
+## What's new in 8.18.0 (AmigaOS release)
+
+- Increased the default stack size from 16384 to 32768. This fixes crashes
+  during TLS handshakes, certificate validation, compressed downloads, and
+  large HTTPS transfers.
+- Retested all supported CPU targets: 68000, 68020, 68040, and 68060. All
+  binaries now pass TLS tests reliably.
+- Updated build system:
+  - GCC 15.2 m68k-amigaos toolchain
+  - clib2 runtime
+  - soft-float ABI
+  - dynamic AmiSSL linking
+  - `-O0` due to current GCC 15 m68k optimization issues
+- Updated protocol support, matching upstream curl 8.18.0 except for protocols
+  requiring unsupported libraries, such as HTTP/2, HTTP/3, SSH, LDAP, IDN,
+  PSL, Brotli, and Zstd.
+
+## Files included
+
+| File | Description |
+| ---- | ----------- |
+| `curl` | 68000 binary |
+| `curl.020` | 68020 binary |
+| `curl.040` | 68040 binary |
+| `curl.060` | 68060 binary |
+| `libcurl.a` | static library (68000) |
+| `libcurl.a.020` | static library (68020+) |
+| `libcurl.a.040` | static library (68040) |
+| `libcurl.a.060` | static library (68060) |
+
+Developers should use the matching libcurl library for their target CPU when
+building Amiga applications.
+
+## Developer information
+
+Used compiler:
+
+```text
+m68k-amigaos-gcc (GCC) 15.2.0
+```
+
+Example autotools configuration:
+
+```sh
+./buildconf &&
+PKG_CONFIG=true ./configure \
+  --host=m68k-amigaos \
+  CC=m68k-amigaos-gcc \
+  --disable-shared \
+  --disable-ipv6 \
+  --prefix=/opt/amiga15 \
+  --disable-netrc \
+  --without-libpsl \
+  --with-amissl \
+  --with-zlib \
+  --disable-threaded-resolver \
+  CFLAGS="-m68000 -O0 -msoft-float -mcrt=clib2" \
+  LIBS="-lnet -lm -lc -lz -lunix -latomic"
+```
+
+Source code for this AmigaOS port is available at:
+
+<https://github.com/boingball/curl>
+
+## Release notes
+
+### curl 8.18.0 - 2025-11-18
+
+- Increased stack cookie to 32768 for TLS stability
+- Updated to GCC 15.2 toolchain
+- Added CPU-specific libcurl libraries
+- Reviewed minor AmigaOS fixes upstream
+
+### curl 8.11.2 - 2024-11-26
+
+- Added stack cookie 16384
+- Improved TLS robustness
+
+### curl 8.11.1 - 2024-11-24
+
+- Initial modern port of curl 8.11 for AmigaOS 3.x
+
+## Distribution
+
+Study the `COPYING` file for distribution terms.

docs/INSTALL.md

@@ -342,6 +342,9 @@ Notes:
 
 ## AmigaOS
 
+See `docs/AMIGAOS.md` for AmigaOS binary archive notes, runtime
+requirements and CPU-specific libcurl library naming.
+
 You can use either autotools or cmake:
 
 ```sh

docs/Makefile.am

@@ -80,6 +80,7 @@ EXTRA_DIST =                                     \
   $(INTERNALDOCS)                                \
   $(TESTDOCS)                                    \
   ALTSVC.md                                      \
+  AMIGAOS.md                                     \
   BINDINGS.md                                    \
   BUG-BOUNTY.md                                  \
   BUGS.md                                        \