configure: do not echo most inherited `LDFLAGS` to config files

`libcurl.pc` `Libs.private` (since 8.11.0, and in `Libs` before 7.20.0)
and `curl-config` `--static-libs` (since 7.17.1, a

configure: do not echo most inherited `LDFLAGS` to config files

`libcurl.pc` `Libs.private` (since 8.11.0, and in `Libs` before 7.20.0)
and `curl-config` `--static-libs` (since 7.17.1, and in `Libs` between
7.7.2-7.25.0). This included all flags inherited from the environment,
in addition to those coming from dependency detections.

To avoid spilling all linker flags inherited from the environment to
the libcurl config files, this patch omits them all, except `-L`, `-F`,
`--library-path=` and `-framework` options, which are still passed.
The rationale for the exceptions is that `LIBS` is passed as-is, and
`LDFLAGS`, `LIBS` are the canonical way to pass custom libs options
to a build. `LIBS` may not work without a matching custom libpath.

This brings autotools behaviour closer to cmake, and `curl-config`
closer to `libcurl.pc`.

Follow-up to 9f56bb608ecfbb8978c6cb72a04d9e8b23162d82 #14681
Follow-up to 4c8adc8fee5e55754da3d8f8d982733a7bf3dece
Reported-by: Peter Marko
Fixes #15533
Closes #15550

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GHA/configure-vs-cmake: check `libcurl.pc`/`curl-config`, fix issues

Add CI checker to compare `libcurl.pc` and `curl-config` files
generated by autotools and cmake builds.

Fix

GHA/configure-vs-cmake: check `libcurl.pc`/`curl-config`, fix issues

Add CI checker to compare `libcurl.pc` and `curl-config` files
generated by autotools and cmake builds.

Fix differences and apply tiny cleanups:
- curl-config: use single-quotes for literals.
- curl-config: quote all variables.
- curl-config: replace double with single quotes in a substituted value
that's always literal (`@prefix@`).
- libcurl.pc: spelling in `Description:`.
- libcurl.pc: avoid substitution in a comment.
- cmake: fill `libdir` with `${exec_prefix}` instead of a literal.
To sync with './configure'.
- configure: fix `CURL_CA_BUNDLE` value to not generate nested quotes
in `curl-config`.
- configure: add missing `LDFLAGS` to `Libs.private` in `libcurl.pc`.
To sync with CMake.
- cmake: skip adding `CMAKE_C_IMPLICIT_LINK_LIBRARIES` for MINGW and
UNIX. They added these values as seen in CI:
MINGW: `-lmingw32 -lgcc -lmoldname -lmingwex -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc -lmoldname -lmingwex`
Linux: `-lgcc -lgcc_s -lc -lgcc -lgcc_s`
- cmake: delete FIXME about enabling libssh2 by default.
`./configure` has special defaults for these packages (called: "off"):
brotli, zstd, libpsl, libssh2, libssh, wolfssl, librtmp
It looks for them, but only at system locations, which makes them
never detected e.g. on macOS. CMake doesn't offer such default mode
for now.
- GHA/macos: drop now redundant `-DCURL_DISABLE_LDAPS=ON`.
- cmake: use `CMAKE_INSTALL_INCLUDEDIR` and `CMAKE_INSTALL_LIBDIR`
instead of hardcoded `include`/`lib` when generating `libcurl.pc`.

Updates to the GHA workflow:
- move autotools out-of-tree and rename cmake out-of-tree directory
to `bld_cm` to tell it's cmake.
- disable static libcurl for `./configure` to match cmake.
- enable `pkg-config` debug output with `./configure`.
- dump list of Homebrew packages on macOS.
- dump `./configure` detailed logs.
- disable zstd and brotli for Linux, to match cmake.

There remain differences, mostly due to detection order and method. Also
some values are inherently different when using CMake and autotools,
such as `--cc`, `--configure`. autotools also generates duplicates for
`-lssl` and `-lcrypto`. macOS LDAP wants to link `-lber` while autotools
doesn't. Some build defaults are also different in autotools and cmake.
These differences are smoothened out for now by the checker script, or
via build options. Notice that lib order (a dupes) _can_ be significant
in some cases. E.g. the binutils linker is infamous for that on Windows.

Closes #14681

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build: tidy up internal macro names for `libcurl.pc`

Rename internal macros to match their `libcurl.pc` metadata counterpart.
Also apply these to the `curl-config.in` template.

build: tidy up internal macro names for `libcurl.pc`

Rename internal macros to match their `libcurl.pc` metadata counterpart.
Also apply these to the `curl-config.in` template.

- `CPPFLAG_CURL_STATICLIB` -> `LIBCURL_PC_CFLAGS`
- `LIBCURL_LIBS` -> `LIBCURL_PC_LIBS_PRIVATE`
- `LIBCURL_NO_SHARED` -> `LIBCURL_PC_LIBS`

Closes #14476

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libcurl.pc: add `Cflags.private`

Ref: https://manpages.debian.org/bookworm/pkgconf/pc.5.en.html#PROPERTY_KEYWORDS
Ref: https://www.msys2.org/docs/pkgconfig/#cflagsprivate-static-librarie

libcurl.pc: add `Cflags.private`

Ref: https://manpages.debian.org/bookworm/pkgconf/pc.5.en.html#PROPERTY_KEYWORDS
Ref: https://www.msys2.org/docs/pkgconfig/#cflagsprivate-static-libraries

Closes #14321

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libcurl.pc: add `Requires.private`, `Requires` for static linking

- cmake: populate for dependencies.
- autotools: populate for dependencies.
(including mbedtls, though the script

libcurl.pc: add `Requires.private`, `Requires` for static linking

- cmake: populate for dependencies.
- autotools: populate for dependencies.
(including mbedtls, though the script does not detect
mbedtls through pkgconfig. mbedtls 3.6.0 now supports it.)

Skip dealing with gssapi in this patch.

Fixes #864
Closes #13911

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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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copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the

copyright: make repository REUSE compliant

Add licensing and copyright information for all files in this repository. This
either happens in the file itself as a comment header or in the file
`.reuse/dep5`.

This commit also adds a Github workflow to check pull requests and adapts
copyright.pl to the changes.

Closes #8869

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Revert "libcurl.pc: make it relocatable"

This reverts commit 3862c37b6373a55ca704171d45ba5ee91dec2c9f.

That fix should either be done differently or with an option.

Reporte

Revert "libcurl.pc: make it relocatable"

This reverts commit 3862c37b6373a55ca704171d45ba5ee91dec2c9f.

That fix should either be done differently or with an option.

Reported-by: asavah on github
Fixes #6157
Closes #6183

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curl.se: new home

Closes #6172

libcurl.pc: make it relocatable

It supposes when people specify the libdir/includedir they do it to
change where under prefix/exec_prefix it should be, not to make it
independent of

libcurl.pc: make it relocatable

It supposes when people specify the libdir/includedir they do it to
change where under prefix/exec_prefix it should be, not to make it
independent of prefix/exec_prefix.

Closes #6061

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libcurl.pc: Merge Libs.private into Libs for static-only builds

A project being built entirely statically will call pkg-config with
--static, which utilises the Libs.private field. Conve

libcurl.pc: Merge Libs.private into Libs for static-only builds

A project being built entirely statically will call pkg-config with
--static, which utilises the Libs.private field. Conversely it will
not use --static when not being built entirely statically, even if
there is only a static build of libcurl available. This will most
likely cause the build to fail due to underlinking unless we merge the
Libs fields.

Consider that this is what the Meson build system does when it
generates pkg-config files.

I have also reflected this in the --libs argument of curl-config even
though REQUIRE_LIB_DEPS always seems to be "yes" anyway.

Closes #5373

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copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyrigh

copyright: fix out-of-date copyright ranges and missing headers

Reported by the new script 'scripts/copyright.pl'. The script has a
regex whitelist for the files that don't need copyright headers.

Removed three (mostly usesless) README files from docs/

Closes #5141

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URLs: change all http:// URLs to https://

build: prevent global LIBS from influencing src and lib build targets

Currently, LIBS is already used through other macros.

Fix libcurl.pc and curl-config generation for static MingW* cross builds

libcurl.pc: version number fix

This hasn't show the version number correctly since the $VERSION change
in the configure, and now it works again.

remove the CVSish $Id$ lines

- Marc Kleine-Budde fixed: curl saved the LDFLAGS set during configure into
its pkg-config file. So -Wl stuff ended up in the .pc file, which is really
bad, and breaks if there are multi

- Marc Kleine-Budde fixed: curl saved the LDFLAGS set during configure into
its pkg-config file. So -Wl stuff ended up in the .pc file, which is really
bad, and breaks if there are multiple -Wl in our LDFLAGS (which are in
PTXdist). bug #2893592 (http://curl.haxx.se/bug/view.cgi?id=2893592)

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- Keith Mok added supported_protocols and supported_features to the pkg-config
file for libcurl, and while doing that fix he unified with curl-config.in
how the supported protocols and fe

- Keith Mok added supported_protocols and supported_features to the pkg-config
file for libcurl, and while doing that fix he unified with curl-config.in
how the supported protocols and features are extracted and used, so both those
tools should now always be synced.

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Use configure's new LIBCURL_LIBS variable

- Modified libcurl.pc.in to use Libs.private for the libs libcurl itself needs
to get built static. It has been mentioned before and was again brought to
our attention by Nathanael Nerode

- Modified libcurl.pc.in to use Libs.private for the libs libcurl itself needs
to get built static. It has been mentioned before and was again brought to
our attention by Nathanael Nerode who filed debian bug report #405226
(http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=405226).

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Dan F's initial pkg-config file (not installed yet)