- silence false positive picky warnings.
- avoid "possible noreturn" warnings for standalone tests and examples.
- fix to compile without `#pragma GCC diagnostic push` support.
- fix "#pragma GCC diagnostic not allowed inside functions".
Prerequisite for #15975 that needs GCC 4.4 for the latest pre-built
CeGCC/mingw32ce toolchain for Windows CE.
Cherry-picked from #15975Closes#16062
Dedupe and migrate MSVC-specific warning suppressions to `curl_setup.h`.
Make cmake set `_CRT_SECURE_NO_DEPRECATE` for examples and standalone
tests, and stop setting `_CRT_NONSTDC_NO_DEPRECATE` for them.
Details:
- drop version guards. On ancient MSVC version these macro are a no-op.
- move to `curl_setup.h` from `config-win32*.h`.
- sync macro values with CMake.
- cmake: stop setting them globally in favour of `curl_setup.h`.
- cmake: re-add these macros to `docs/examples` and `tests/http/clients`,
which do not use `curl_setup.h`.
- cmake: drop `_CRT_NONSTDC_NO_DEPRECATE` for examples and tests.
They build fine without.
- update comments.
Closes#15960
This isn't needed anymore after https://github.com/curl/curl/pull/15835,
since banned functions are just allowed in general in
`docs/examples/.checksrc`, and emits a warning when running make
checksrc:
`invalid warning specified in .checksrc: "SNPRINTF"`
Closes#15916
Use 'banfunc' and 'allowfunc' in .checksrc to specify which functions to
ban or allow to be used. This saves us from having to edit the script
going forward when we want to ban or allow specific functions.
This replaces a set of previous rules and all banned functions are now
checked with the BANNEDFUNC rule.
There is a set of default banned functions, shown by invoking
./checksrc.
Also, -a and -b options are added to specify allowed or banned functions
on the command line.
Closes#15835
build:
- autotools: fix to build generated sources for the `tidy` target.
- autotools: allow passing custom clang-tidy options via
`CURL_CLANG_TIDYFLAGS` env.
- cmake: add `CURL_CLANG_TIDY` option to configure for `clang-tidy`.
Also add:
- `CLANG_TIDY` variable to customize the `clang-tidy` tool.
- `CURL_CLANG_TIDYFLAGS` to pass custom options to `clang-tidy`.
- apply `--enable-werror` and `-DCURL_WERROR=ON` to `clang-tidy`.
CI/GHA:
- add clang-tidy job for Linux, using autotools and clang-tidy v18.
This one needs to disable `clang-analyzer-valist.Uninitialized`
to avoid false positives:
https://github.com/llvm/llvm-project/issues/40656
Duration: 5.5 minutes
- add clang-tidy job for macOS, using cmake and clang-tidy v19.
This one also covers tests and examples, and doesn't hit the false
positives seen with llvm v18 and earlier.
Duration: 4.5 minutes
- Linux/macOS: skip installing test dependencies when not building or
running tests.
fix fallouts reported by `clang-tidy`:
- lib:
- cf-h2-proxy: unused assignment in non-debug builds.
- cf-socket: silence warning.
FIXME: https://github.com/curl/curl/pull/15825#issuecomment-2561867769
- ftp: NULL passed to `strncmp()`.
- http2: NULL-ptr deref.
- mprintf: silence warning.
- src/tool_writeout: NULL passed to `fputs()`.
- examples:
- invalid file pointers.
- missing `fclose()`.
- tests:
- http/clients/hx-download: memory leaks on error.
- http/clients/hx-download: memory leak on repeat `-r` option.
- server: double `fclose()`.
https://www.man7.org/linux/man-pages/man3/fclose.3.html
- server: invalid file pointer/handle.
- server/getpart: unused assignments.
- server/mqttd: leak on failed `realloc()`.
- server/tftpd: NULL passed to `strcmp()`.
Closes#15825
For MinGW this is `-DNO_OLDNAMES`, with MSVC it is
`-D_CRT_DECLARE_NONSTDC_NAMES=0`.
There have been some support for this before this patch.
After this patch this is extended to all examples.
(And also the standalone http/client programs, if here.)
Cherry-picked from #15652Closes#15789
This example can use the Date: header of any server so there is no point
in linking to ancient URLs describeing a setup at NIST that no longer
exists.
Closes#15786
`Makefile.mk` supported MS-DOS and Amiga, but `./configure` also
supported them in a better tested and more flexible way.
This patch also adds CMake support for MS-DOS/DJGPP and Amiga OS 3.
`Makefile.mk` was not maintained. Delete it in favour of first-tier
build methods.
Also include some non-MS-DOS/AmigaOS-specific tidy-up, see details at
the end of this message.
Details:
- fix/silence all MS-DOS/DJGPP build warnings and issues.
- add MS-DOS support to cmake.
- default to `ENABLE_THREADED_RESOLVER=OFF` for MS-DOS.
- add support for `WATT_ROOT`.
- use static libcurl with MS-DOS.
- fixup default CMake suffixes/prefixes for DJGPP.
- disable hidden symbols for MS-DOS. Not supported on MS-DOS.
- opt-in MS-DOS into `USE_UNIX_SOCKETS`.
- improve MS-DOS support in autotools.
- default to `--disable-threaded-resolver` for MS-DOS.
- make sure to use `close_s()` (from Watt-32) with autotools and cmake.
`Makefile.mk` used it before this patch.
- GHA: add DJGPP cmake (~30s) and autotools (~60s) build jobs.
Also build tests and examples with cmake.
- improve AmigaOS support in autotools:
- configure: detect `CloseSocket()` when it's a macro.
- configure: fix `IoctlSocket` detection on AmigaOS.
- curl-amissl.m4: pass AmiSSL libs to tests/servers.
- add AmigaOS3 support to cmake:
- cmake: fix `HAVE_IOCTLSOCKET_CAMEL` and
`HAVE_IOCTLSOCKET_CAMEL_FIONBIO` detections.
- set necessary system libs.
- add AmiSSL support.
- inet_ntop, inet_pton: fix using it for AmigaOS. cmake detects them,
and they did not compile with AmigaOS.
- cmake: better sync `gethostname` detection with autotools.
Fixes detection for AmigaOS, where `gethostname` is a macro.
- cmake: fix `sys/utime.h` detection on AmigaOS.
- cmake: force-disable `getaddrinfo` for AmigaOS.
- cmake: tweak threading and static/shared default for AmigaOS.
- cmake: rely on manual variable `AMIGA` to enable the platform.
- GHA: add AmigaOS cmake and autotools (~45s) jobs.
Also build tests and examples with cmake.
- INSTALL: update MS-DOS and AmigaOS build instructions.
- amigaos: fix `-Wpointer-sign` and
`zero or negative size array '_args'` in `Printf()`.
- amigaos: fix `-Wpointer-sign`
- amigaos: fix `-Wredundant-decls` `errno` and `h_errno`.
- amigaos: brute-force silence `lseek()` size warnings.
- amigaos: server/resolve: silence `-Wdiscarded-qualifiers`.
- amigaos: server/resolve: fix `-Wpointer-sign`.
- amigaos: fix `CURL_SA_FAMILY_T` type.
- nonblock: prefer `HAVE_IOCTLSOCKET_CAMEL_FIONBIO` for AmigaOS.
`ioctl` is also detected, but fails when used. Make the above override
it for a successful build.
Authored-by: Darren Banfi
Fixes#15537Closes#15603
- tftpd: prefer `HAVE_IOCTLSOCKET_CAMEL_FIONBIO` for AmigaOS.
- tftpd: tidy-up conditional code.
- curl: set stack size to 16384 for AmigaOS3/4
Overriding the default 4096.
Suggested-by: Darren Banfi
Ref: https://github.com/curl/curl/pull/15543#issuecomment-2498783123
Ref: https://wiki.amigaos.net/wiki/Controlling_Application_Stack
- functypes.h: fix `SEND_QUAL_ARG2` for AmigaOS.
- tftp: add missing cast in sendto() call for AmigaOS.
- getinfo: fix warning with AmigaOS.
- tool_operate: silence warning with AmigaOS
- amigaos: fix building libtests due to missing `RLIMIT_NOFILE`.
- curl_gethostname: silence warning for AmigaOS.
- ftp: silence `-Wtype-limits` for AmigaOS.
- libtest: fix timeval initialization for AmigaOS.
- examples: fix `timeval` initialization for AmigaOS.
- examples: silence warning for AmigaOS.
- configure: fix IPv6 detection for cross-builds.
- netrc: fix to build with AmigaOS cleanly.
- buildinfo: detect and add `DOS` tag for MS-DOS builds.
- buildinfo: add `AMIGA` to buildinfo.txt in auttools.
- build: move `USE_WATT32` macro definition to cmake/configure.
Non-MS-DOS/AmigeOS-specific tidy-ups:
- configure: sync `sa_family_t` detection with cmake.
- configure: sync `ADDRESS_FAMILY` detection signals with cmake.
- doh: use `CURL_SA_FAMILY_T`.
- lib: drop mingw-specific `CURL_SA_FAMILY_T` workaround.
- cmake: extend instead of override check-specific
configurations/requirements.
This allows to honor global requirements added earlier.
Necessary for AmigaOS for example.
- cmake: omit warning on disabled IPv6 for MS-DOS and AmigaOS.
No IPv6 support on these platforms. Also sync with autotools.
- lib1960: use libcurl `inet_pton()` wrapper.
- cmake: detect LibreSSL (to match autotools).
- cmake: say the specific OpenSSL flavour detected.
- hostip: add missing `HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID` guard.
- lib: simplify classic mac feature guards.
Follow-up to a8861b6ccd#9764Closes#15543
Prefix (or suffix) curl-defined macro and function names with `curl`.
To avoid collisions with non-curl CMake and to make them recognizable
as curl-specific calls.
Closes#15498
Using sscanf() is not a (security) problem in itself, but we strongly
discorage using it for parsing input since it is hard to use right, easy
to mess up and often makes for sloppy error checking.
Allow it in examples and tests
Closes#15687
The MSVC UWP job in CI did not actually enable UWP. Fix this and
the fallouts discovered after enabling it.
- GHA/windows: make sure to enable UWP in MSVC vcpkg UWP job.
Use the CMake options and C flags already used for mingw-w64, but use
`WINAPI_FAMILY_PC_APP` instead of the deprecated `WINAPI_FAMILY_APP`.
(The former is not supported by mingw-w64, so leave it there as-is.)
Follow-up to cb22cfca69#14077
- GHA/windows: by default the MSVC UWP job became 2x-3x slower than
others after actually enabling UWP. Most of it is caused by
CMake/MSBuild automatically building full APPX containers for each
`.exe` target. This includes 21 CMake feature detections. Each
detection app is built into a 15MB APPX project, with code signing,
logos, etc. Example:
https://github.com/curl/curl/actions/runs/12056968170/job/33620610958
Disable this overhead for curl build targets via custom
`CMAKE_VS_GLOBALS` options. I've found no way to apply them to feature
detection targets, so those remain slow.
- cmake: automatically enable Unicode for UWP builds. It's required.
Also stop enabling it manually in the existing CI job.
- tests: fix `getpid()` use for Windows UWP:
```
tests\server\util.c(281,21): warning C4013: 'getpid' undefined; assuming extern returning int
```
Ref: https://github.com/curl/curl/actions/runs/12061215311/job/33632904249#step:11:38
- src/tool_doswin: disable `GetLoadedModulePaths()` for UWP.
mingw-w64 UWP was okay with this, but MS SDK headers are not.
This makes `--dump-module-paths` return empty for UWP builds.
```
src\tool_doswin.c(620,3): error C2065: 'MODULEENTRY32': undeclared identifier
src\tool_doswin.c(626,11): warning C4013: 'CreateToolhelp32Snapshot' undefined; assuming extern returning int
src\tool_doswin.c(626,36): error C2065: 'TH32CS_SNAPMODULE': undeclared identifier
src\tool_doswin.c(632,7): warning C4013: 'Module32First' undefined; assuming extern returning int
```
Ref: https://github.com/curl/curl/actions/runs/12055081933/job/33614629930#step:9:35
- examples: fix `websocket.c` to include `winsock2.h` before `windows.h`
to make it build with MSVC UWP:
```
include\curl\curl.h(143,16): error C2061: syntax error: identifier 'curl_socket_t'
include\curl\curl.h(143,16): error C2059: syntax error: ';'
include\curl\curl.h(417,52): error C2146: syntax error: missing ')' before identifier 'curlfd'
include\curl\curl.h(417,38): error C2081: 'curl_socket_t': name in formal parameter list illegal
```
Ref: https://github.com/curl/curl/actions/runs/12055317910/job/33615644427#step:14:126
- GHA/windows: silence linker warning with MSVC UWP builds:
```
LINK : warning LNK4075: ignoring '/INCREMENTAL' due to '/OPT:ICF' specification
```
Ref: https://github.com/curl/curl/actions/runs/12055696808/job/33616629610#step:11:38
- GHA/windows: set `/INCREMENTAL:NO` for all MSVC jobs to improve
performance a little.
- cmake: show `UWP` platform flag.
Ref: #15652Closes#15657
- appveyor: add build-only job for clang-cl.
- cmake: `-pedantic-errors` enables `-Werror,-Wlanguage-extension-token`
automatically, which makes `__int64` detection fail.
Explictly disable this compiler warning for clang-cl to make the
feature detection work and to accept `__int64` in the source code.
- cmake: disable `-Wlanguage-extension-token` warning for clang-cl
to fix these when encountering `__int64`:
```
lib/formdata.c(797,29): error : extension used [-Werror,-Wlanguage-extension-token]
lib/warnless.c(117,33): error : extension used [-Werror,-Wlanguage-extension-token]
lib/warnless.c(60,28): message : expanded from macro 'CURL_MASK_SCOFFT'
lib/warnless.c(59,38): message : expanded from macro 'CURL_MASK_UCOFFT'
include\curl/system.h(352,40): message : expanded from macro 'CURL_TYPEOF_CURL_OFF_T'
```
- make `__GNUC__` warning suppressions apply to `__clang__` too.
Necessary for clang-cl, which defines the latter, but not the former.
(Regular clang defines both.)
- examples: fix clang-cl compiler warning in `http2-upload.c`.
```
docs\examples\http2-upload.c(56,5): error : no previous prototype for function 'my_gettimeofday' [-Werror,-Wmissing-prototypes]
docs\examples\http2-upload.c(56,1): message : declare 'static' if the function is not intended to be used outside of this translation unit
```
- unit2604: add missing `#pragma GCC diagnostic pop`.
Follow-up to e53523fef0#14859
- unit1652: limit compiler warning suppression to GCC.
They do not affect clang builds.
Follow-up to 71cf0d1fca#14772Closes#15449
Fix new issues found by `proselint`.
Also:
- silence this technical warning:
```
:0: DeprecationWarning: /home/runner/.proselintrc was found instead of a JSON file. Rename to /home/runner/.proselintrc.json.
```
- fix an input filename.
`proselints` fails now if an input file is missing.
Reported-by: Jay Satiro
Bug: https://github.com/curl/curl/pull/15291#issuecomment-2410505100Closes#15293
Suppress deprecation warnings the closest to the deprecated code, using
`CURL_IGNORE_DEPRECATION()`. Then drop build-specific suppressions, and
file-wide ones. The latter is not compatible with Unity mode. Also
replace manual suppressions with a macro to apply to all compilers with
deprecation warning support. Also enable deprecation warnings for clang.
- curl/curl.h: enable deprecation warnings for clang.
- docs/examples: stop setting `CURL_DISABLE_DEPRECATION` with autotools.
Suppression moved to C-level earlier. Syncs with cmake.
Follow-up to 5fc61a37c1#14123
- tests/http/clients: stop setting `CURL_DISABLE_DEPRECATION` in
autotools. If it becomes necessary in the future, it can be done in
C via the macro. Syncs with cmake.
- lib1545: stop setting `CURL_DISABLE_DEPRECATION` in autotools.
Drop guard from test source.
Follow-up to 0f10360073#12444
- libtest, unit: replace `CURL_DISABLE_DEPRECATION` with
`CURL_IGNORE_DEPRECATION()`.
- docs/examples: replace pragmas with `CURL_IGNORE_DEPRECATION()`.
Closes#14789
- Move `docs/examples` builds under a separate target.
- Make `BUILD_EXAMPLES` default to `ON`. It means to generate the rules
for `docs/examples` by default, but not build them. To build them,
an explicit `make curl-examples` (or ninja, etc) command is necessary.
This syncs behaviour with autotools, and also how both cmake and
autotools are building tests.
- GHA: update cmake jobs to use the new way of building examples.
- GHA: move examples build step at the end of the job, after building
and running tests. This allows to have build and test run results
faster, and leave the seldom-changing examples build to the end.
Building examples is the slowest build step with no practical way to
make them fast.
- appveyor: enable building examples in two old-MSVC jobs.
- examples: fix examples to build cleanly with old MSVC versions.
- GHA/non-native: move example build log under a GHA foldable section.
- GHA/windows: move building examples into separate step for Linux cross
jobs.
Follow-up to dfdd978f7c#13491Closes#14906
Change mingw-w64 printf format checks in public curl headers to use
`__MINGW_PRINTF_FORMAT` instead of `gnu_printf`. This syncs the format
checker with format string macros published via `curl/system.h`. (Also
disable format checks for mingw-w64 older than 3.0.0 (2013-09-20) and
classic-mingw, which do not support this macro.)
This fixes bogus format checker `-Wformat` warnings in 3rd party code
using curl format strings with the curl printf functions, when using
mingw-w64 7.0.0 (2019-11-10) and older (with GCC, MSVCRT).
It also allows to delete two workaounds for this within curl itself:
- setting `-D__USE_MINGW_ANSI_STDIO=1` for mingw-w64 via cmake and
configure for `docs/examples` and `tests/http/clients`.
Ref: c730c8549b#14640
The format check macro is incompatible (depending on mingw-w64 version
and configuration) with the C99 `%z` (`size_t`) format string used
internally by curl.
To work around this problem, override the format check style in curl
public headers to use `gnu_printf`. This is compatible with `%z` in all
mingw-w64 versions and allows keeping the C99 format strings internally.
Also:
- lib/ws.c: add missing space to an error message.
- docs/examples/ftpgetinfo.c: fix to use standard printf.
Ref: #14643 (take 1)
Follow-up to 3829759bd0#12489Closes#14703
- reuse local variable names.
- sync `PROJECT_LABEL`, add where missing.
- namespace all target names.
- bind header directories to each target.
- tests/server: limit `CURL_STATICLIB` to Windows (as in autotools.)
- drop functions with a single caller.
Closes#14660
Add tweak for mingw-w64 when building tests/http/client programs to
avoid a bogus `-Wformat` warning when using mingw-w64 v7.0.0 or older.
The warning is bogus because these programs use curl's `printf()`
implementation that is guaranteed to support that format spec.
Add this for both CMake and autotools. (But only CMake is CI tested with
an old toolchain.)
Apply the workaround to `docs/examples`, and fix an example to use
curl's `printf()` with `CURL_FORMAT_CURL_OFF_T`.
Reintroduce curl `printf()` calls into `tests/http/client`, via #14625.
Also restore large number masks to a printf, changed earlier in #14382.
Follow-up to 232302f88a#14382
Ref: https://github.com/curl/curl/pull/14625#issuecomment-2302361737Closes#14640
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
- quote string literals.
In the hope it improves syntax-highlighting and readability.
- use lowercase, underscore-prefixed local var names.
As a hint for scope, to help readability.
- prefer `pkg_search_module` (over `pkg_check_modules`).
They are the same, but `pkg_search_module` stops searching
at the first hit.
- more `IN LISTS` in `foreach()`.
- OtherTests.cmake: clear `CMAKE_EXTRA_INCLUDE_FILES` after use.
- add `PROJECT_LABEL` for http/client and unit test targets.
- sync `Find*` module comments and formatting.
- drop a few local variables.
- drop bogus `CARES_LIBRARIES` from comment.
- unquote numeric literal.
Follow-up to acbc6b703f#14197Closes#14388
- sync build-dir/source-dir header path order with autotools, by
including build-dir first, then source-dir.
This prevents out-of-tree builds breaking due to leftover generated
headers in the source tree.
- tests/unit: move `src` ahead of `libtest` in header path, syncing with
autotools.
- stop adding non-existing generated `include` dir to header path.
There are no generated `include` headers and this directory is either
missing in out-of-tree builds or the same as the one already added
globally via the root `CMakeLists.txt`.
- lib: stop adding a duplicate source include directory to the header
path.
It's already added globally via the root `CMakeLists.txt`.
- lib: stop adding the project root to the header path.
- docs/examples: drop internal header paths.
Examples do not and should not use internal headers.
- replace `curl_setup_once.h` in comments with `curl_setup.h`,
the header actually used, and also referred to in autotools comments.
- add comment why we need `src` in include path for `tests/server`.
- add quotes around header directories.
Closes#14416
Use these words and casing more consistently across text, comments and
one curl tool output:
AIX, ALPN, ANSI, BSD, Cygwin, Darwin, FreeBSD, GitHub, HP-UX, Linux,
macOS, MS-DOS, MSYS, MinGW, NTLM, POSIX, Solaris, UNIX, Unix, Unicode,
WINE, WebDAV, Win32, winbind, WinIDN, Windows, Windows CE, Winsock.
Mostly OS names and a few more.
Also a couple of other minor text fixups.
Closes#14360
- tidy-up comments.
- use lowercase, underscore prefixed names for internal variables.
- use `IN LISTS` and `IN ITEMS` in `foreach()` loops.
- rename variable name `OUTPUT` to a more distinctive one.
- tidy-up `STREQUAL` syntax.
- delete commented code.
- indent/whitespace.
Closes#14197
- shows how to pass on local variables (better)
- start the transfers nicer (with curl_multi_socket_action)
- consistent and helpful function naming - to better show what functions
and callbacks that are used for what
- build warning-free with gcc -W -Wall -pedantic
Closes#14287
Simplify making clean builds by silencing deprecation warnings inside
the example code where these may occur.
Drop related build tweaks/comments from GHA jobs.
Example warning:
```
curl/docs/examples/postit2-formadd.c:65:16: error: 'CURLFORM_COPYNAME' is deprecated: since 7.56.0. Use curl_mime_name() [-Werror=deprecated-declarations]
65 | CURLFORM_COPYNAME, "sendfile",
| ^~~~~~~~~~~~~~~~~
```
Ref: https://github.com/curl/curl/actions/runs/9841099503/job/27166970904#step:10:829Closes#14123
- Remove the locking callback code that demonstrates how to meet
requirements of threading libraries (mainly OpenSSL).
Locking callback code has not been needed for many years. According to
the documentation for OpenSSL and GnuTLS they are thread-safe by design,
assuming support for the underlying OS threading API is built-in.
Ref: https://github.com/curl/curl/pull/13850#issuecomment-2143538458
Closes https://github.com/curl/curl/pull/13851
Delete a bunch of unnecessary-looking headers from some examples. This
is known to be tricky on AIX (perhaps also in other less-tested envs).
Let me know if any of this looks incorrect or outright fails on some
systems.
Follow-up to d4b8589055#13771Closes#13785
- `websocket.c`: use `Sleep()` on Windows.
`sleep()` and `unistd.h` are not available in MSVC.
- `http2-upload.c`: use local `gettimeofday()` implementation when
compiled with MSVC.
(Alternate solution is to disable the trace function for MSVC.)
Public domain code copied and adapted from libssh2:
e973493f99/src/misc.c (L719-L743)
- silence compiler warning for deprecated `inet_addr()`.
Also drop duplicate winsock2 include.
```
curl\docs\examples\externalsocket.c(125,32): error C2220: the following warning is treated as an error [curl\bld\docs\examples\curl-example-externalsocket.vcxproj]
curl\docs\examples\externalsocket.c(125,32): warning C4996: 'inet_addr': Use inet_pton() or InetPton() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings [curl\bld\docs\examples\curl-example-e
```
Ref: https://github.com/curl/curl/actions/runs/9227337318/job/25389073450#step:4:95
- silence an MSVC compiler warning. This is in conflict with `checksrc`
rules, so silence the rule in favour of the warning-free C syntax.
```
curl\docs\examples\multi-legacy.c(152,1): error C2220: the following warning is treated as an error [curl\bld\docs\examples\curl-example-multi-legacy.vcxproj]
curl\docs\examples\multi-legacy.c(152,1): warning C4706: assignment within conditional expression [curl\bld\docs\examples\curl-example-multi-legacy.vcxproj]
```
Ref: https://github.com/curl/curl/actions/runs/9227337318/job/25389073450#step:4:226
- do not use `sys/time.h` and `unistd.h` in Windows builds.
Some of these includes look unnecessary. Subject to another PR.
Cherry-picked from #13766Closes#13771
You can enable it with `-DBUILD_EXAMPLES=ON`.
To match autotools' `make examples` feature.
Windows (static) builds not tested.
Also enable examples in a pair of CI jobs.
Apply related updates to the macOS CI workflow:
- drop unused `CXX` envs.
- drop no longer needed `-Wno-error=undef -Wno-error=conversion` flags.
- pass `-Wno-deprecated-declarations` to GCC too (for `BUILD_EXAMPLES`).
- document why `-Wno-deprecated-declarations` is necessary.
Closes#13491
This fixes miscellaneous typos and duplicated words in the docs, lib
and test comments and a few user facing errorstrings.
Author: RainRat on Github
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Reviewed-by: Dan Fandrich <dan@coneharvesters.com>
Closes: #13019
