curl/m4
Viktor Szakats c6988f9131
curlx: move Curl_gmtime(), use gmtime_s() on Windows
Move `Curl_gmtime()` to curlx and rename to `curlx_gmtime()`. Then call
the internal wrapper also from the curl tool, to avoid using the banned
`gmtime()` directly, and using better, thread-safe alternatives when
available.

Windows `gmtime_s()` requires mingw-w64 v4+ or MSVC. Use local
workaround to also support mingw-w64 v3. `gmtime_s()` also makes
defining `_CRT_SECURE_NO_WARNINGS` unnecessary.

Also:
- lib: drop unused `parsedate.h` includes.
- drop redundant cast from `gmtime_r()` result.
- autotools: reverse condition in the proto detection to avoid
  misleading readers. (the condition plays no role in detection.)
- note Windows XP's default `msvcrt.dll` doesn't offer secure CRT APIs.
  XP likely needs a newer version of this DLL, or may not run.

Refs:
https://learn.microsoft.com/cpp/c-runtime-library/reference/gmtime-gmtime32-gmtime64
https://learn.microsoft.com/cpp/c-runtime-library/reference/gmtime-s-gmtime32-s-gmtime64-s
https://pubs.opengroup.org/onlinepubs/9799919799/functions/gmtime.html
https://linux.die.net/man/3/gmtime_r

Ref: #19957 (for `localtime_r()`)
Follow-up to 54d9f060b4
Closes #19955
2025-12-16 14:30:05 +01:00
..
.gitignore tidy-up: .gitignore lines mostly 2025-01-27 20:59:46 +01:00
curl-amissl.m4 tidy-up: miscellaneous 2025-12-12 04:18:48 +01:00
curl-apple-sectrust.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-compilers.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-confopts.m4 autotools: drop reference to deleted CURL_CHECK_CURLDEBUG 2025-12-11 11:42:27 +01:00
curl-functions.m4 curlx: move Curl_gmtime(), use gmtime_s() on Windows 2025-12-16 14:30:05 +01:00
curl-gnutls.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-mbedtls.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-openssl.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-override.m4 badwords: add more contractions, fix fallouts 2025-11-17 19:29:15 +01:00
curl-reentrant.m4 badwords: add more contractions, fix fallouts 2025-11-17 19:29:15 +01:00
curl-rustls.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-schannel.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-sysconfig.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
curl-wolfssl.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
xc-am-iface.m4 misc: cleanup after removing years from copyright 2024-07-30 14:11:48 +02:00
xc-cc-check.m4 misc: cleanup after removing years from copyright 2024-07-30 14:11:48 +02:00
xc-lt-iface.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
xc-val-flgs.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
zz40-xc-ovr.m4 autotools: tidy-up if expressions 2025-12-10 22:29:19 +01:00
zz50-xc-ovr.m4 badwords: add more contractions, fix fallouts 2025-11-17 19:29:15 +01:00