build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch ma

build: prefer `USE_IPV6` macro internally (was: `ENABLE_IPV6`)

Before this patch, two macros were used to guard IPv6 features in curl
sources: `ENABLE_IPV6` and `USE_IPV6`. This patch makes the source use
the latter for consistency with other similar switches.

`-DENABLE_IPV6` remains accepted for compatibility as a synonym for
`-DUSE_IPV6`, when passed to the compiler.

`ENABLE_IPV6` also remains the name of the CMake and `Makefile.vc`
options to control this feature.

Closes #13349

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Makefile.mk: drop Windows support

And DLL-support with it. This leaves `Makefile.mk` for MS-DOS and Amiga.

We recommend CMake instead. With unity mode it's much faster, and about

Makefile.mk: drop Windows support

And DLL-support with it. This leaves `Makefile.mk` for MS-DOS and Amiga.

We recommend CMake instead. With unity mode it's much faster, and about
the same without.

Ref: https://github.com/curl/curl/pull/12221#issuecomment-1783761806
Reviewed-by: Daniel Stenberg
Closes #12224

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Makefile.mk: fix `-rtmp` option for non-Windows [ci skip]

Makefile.mk: always set `CURL_STATICLIB` for lib (Windows)

Also fix to export all symbols in Windows debug builds, making
`-debug-dyn` builds work with `-DCURL_STATICLIB` set.

R

Makefile.mk: always set `CURL_STATICLIB` for lib (Windows)

Also fix to export all symbols in Windows debug builds, making
`-debug-dyn` builds work with `-DCURL_STATICLIB` set.

Ref: https://github.com/curl/curl/pull/11914 (same for CMake)

Closes #11924

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cmake: add support for single libcurl compilation pass

Before this patch CMake builds used two separate compilation passes to
build the shared and static libcurl respectively. This patch

cmake: add support for single libcurl compilation pass

Before this patch CMake builds used two separate compilation passes to
build the shared and static libcurl respectively. This patch allows to
reduce that to a single pass if the target platform and build settings
allow it.

This reduces CMake build times when building both static and shared
libcurl at the same time, making these dual builds an almost zero-cost
option.

Enable this feature for Windows builds, where the difference between the
two passes was the use of `__declspec(dllexport)` attribute for exported
API functions for the shared builds. This patch replaces this method
with the use of `libcurl.def` at DLL link time.

Also update `Makefile.mk` to use `libcurl.def` to export libcurl API
symbols on Windows. This simplifies (or fixes) this build method (e.g.
in curl-for-win, which generated a `libcurl.def` from `.h` files using
an elaborate set of transformations).

`libcurl.def` has the maintenance cost of keeping the list of public
libcurl API symbols up-to-date. This list seldom changes, so the cost
is low.

Closes #11546

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ngtcp2: build with 0.17.0 and nghttp3 0.13.0

- ngtcp2_crypto_openssl was renamed to ngtcp2_crypto_quictls.

Closes #11428

Makefile.mk: fix -g option in debug mode [ci skip]

Add it to `CFLAGS` (was: `LDFLAGS`).

Closes #10747

Makefile.mk: delete redundant `HAVE_LDAP_SSL` macro [ci skip]

Since abebb2b8939c6b3e0f951eb2d9ec3729b569aa2c, we set this macro for
all Windows `wldap32` builds using `Makefile.mk`.

Makefile.mk: delete redundant `HAVE_LDAP_SSL` macro [ci skip]

Since abebb2b8939c6b3e0f951eb2d9ec3729b569aa2c, we set this macro for
all Windows `wldap32` builds using `Makefile.mk`.

For OpenLDAP builds this macro is not enough to enable LDAPS, and
OpenLDAP is not an option in `Makefile.mk`. For Novell LDAP it might
have helped, but it's also not an option anymore in `Makefile.mk`.

The future for LDAPS is that we should enable it by default without
extra build knobs.

Reviewed-by: Marcel Raad
Closes #10681

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tls: fixes for wolfssl + openssl combo builds

1. Add `USE_WOLFSSL` to the TLS backend priority list in
`lib/curl_ntlm_core.c`.

2. Fix `lib/curl_ntlm_core.h` to respect TLS ba

tls: fixes for wolfssl + openssl combo builds

1. Add `USE_WOLFSSL` to the TLS backend priority list in
`lib/curl_ntlm_core.c`.

2. Fix `lib/curl_ntlm_core.h` to respect TLS backend priority, bringing
it in sync with the above list and `lib/curl_ntlm_core.c` itself.

Reported-by: Mark Roszko
Ref: https://github.com/curl/curl/issues/10321

3. Allow enabling both wolfSSL and OpenSSL at the same time in
`lib/Makefile.mk` bringing this in line with cmake/autotools builds.
Update logic to select the crypto-specific lib for `ngtcp2`, which
supports a single TLS backend at the same time.

Closes #10322

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copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- save

copyright: update all copyright lines and remove year ranges

- they are mostly pointless in all major jurisdictions
- many big corporations and projects already don't use them
- saves us from pointless churn
- git keeps history for us
- the year range is kept in COPYING

checksrc is updated to allow non-year using copyright statements

Closes #10205

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Makefile.mk: fix wolfssl and mbedtls default paths

Fix the defaults for `WOLFSSL_PATH` and `MBEDTLS_PATH` to have
meaningful values instead of the copy-pasted wrong ones.

Ref: h

Makefile.mk: fix wolfssl and mbedtls default paths

Fix the defaults for `WOLFSSL_PATH` and `MBEDTLS_PATH` to have
meaningful values instead of the copy-pasted wrong ones.

Ref: https://github.com/curl/curl/commit/66e68ca47f7fd00dff2cb7c45ba6725d40099585#r94275172

Reported-by: Ryan Schmidt
Closes #10164

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Makefile.mk: improve a GNU Make hack [ci skip]

Replace the hack of using `$() ` to represent a single space. The new
method silences the `--warn-undefined-variables` debug warning and it

Makefile.mk: improve a GNU Make hack [ci skip]

Replace the hack of using `$() ` to represent a single space. The new
method silences the `--warn-undefined-variables` debug warning and it's
also a better-known form of solving this problem.

Reviewed-by: Jay Satiro
Closes #10031

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Makefile.mk: address minor issues

- Fix `NROFF` auto-detection with certain shell/make-build combinations:

When a non-MSYS2 GNU Make runs inside an MSYS2 shell, Make executes

Makefile.mk: address minor issues

- Fix `NROFF` auto-detection with certain shell/make-build combinations:

When a non-MSYS2 GNU Make runs inside an MSYS2 shell, Make executes
the detection command as-is via `CreateProcess()`. It fails because
`command` is an `sh` built-in. Ensure to explicitly invoke the shell.

- Initialize user-customizable variables:

Silences a list of warnings when running GNU Make with the option
`--warn-undefined-variables`. Another benefit is that it's now easy
to look up all user-customizable `Makefile.mk` variables by grepping
for ` ?=` in the curl source tree.

Suggested-by: Gisle Vanem
Ref: https://github.com/curl/curl/pull/9764#issuecomment-1330674433

- Fix `MKDIR` invocation:

Avoid a warning and potential issue in envs without forward-slash
support.

Closes #10000

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Makefile.mk: portable Makefile.m32

Update bare GNU Make `Makefile.m32` to:

- Move objects into a subdirectory.
- Add support for MS-DOS. Tested with DJGPP.
- Add support for

Makefile.mk: portable Makefile.m32

Update bare GNU Make `Makefile.m32` to:

- Move objects into a subdirectory.
- Add support for MS-DOS. Tested with DJGPP.
- Add support for Watt-32 (on MS-DOS).
- Add support for AmigaOS.
- Rename `Makefile.m32` to `Makefile.mk`
- Replace `ARCH` with `TRIPLET`.
- Build `tool_hugehelp.c` proper (when tools are available).
- Drop MS-DOS compatibility macro `USE_ZLIB` (replaced by `HAVE_LIBZ`)
- Add support for `ZLIB_LIBS` to override `-lz`.
- Omit object files when building examples.
- Default `CC` to `gcc` once again, for convenience. (Caveat: compiler
name `cc` cannot be set now.)
- Set `-DCURL_NO_OLDIES` for examples, like autotools does.
- Delete `makefile.dj` files. Notice the configuration details and
defaults are not retained with the new method.
- Delete `makefile.amiga` files. A successful build needs a few custom
options. We're also not retaining all build details from the existing
Amiga make files.
- Rename `Makefile.m32` to `Makefile.mk` to reflect that they are not
Windows/MinGW32-specific anymore.
- Add support for new `CFG` options: `-map`, `-debug`, `-trackmem`
- Set `-DNDEBUG` by default.
- Allow using `-DOS=...` in all `lib/config-*.h` headers, syncing this
with `config-win32.h`.
- Look for zlib parts in `ZLIB_PATH/include` and `ZLIB_PATH/lib`
instead of bare `ZLIB_PATH`.

Note that existing build configurations for MS-DOS and AmigaOS likely
become incompatible with this change.

Example AmigaOS configuration:
```
export CROSSPREFIX=/opt/amiga/bin/m68k-amigaos-
export CC=gcc
export CPPFLAGS='-DHAVE_PROTO_BSDSOCKET_H'
export CFLAGS='-mcrt=clib2'
export LDFLAGS="${CFLAGS}"
export LIBS='-lnet -lm'
make -C lib -f Makefile.mk
make -C src -f Makefile.mk
```

Example MS-DOS configuration:
```
export CROSSPREFIX=/opt/djgpp/bin/i586-pc-msdosdjgpp-
export WATT_PATH=/opt/djgpp/net/watt
export ZLIB_PATH=/opt/djgpp
export OPENSSL_PATH=/opt/djgpp
export OPENSSL_LIBS='-lssl -lcrypt'
export CFG=-zlib-ssl
make -C lib -f Makefile.mk
make -C src -f Makefile.mk
```

Closes #9764

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