curl-curl/CMake
Viktor Szakats f4e23950c7
build: enable -Wcast-qual, fix or silence compiler warnings
The issues found fell into these categories, with the applied fixes:

- const was accidentally stripped.
  Adjust code to not cast or cast with const.

- const/volatile missing from arguments, local variables.
  Constify arguments or variables, adjust/delete casts. Small code
  changes in a few places.

- const must be stripped because an API dependency requires it.
  Strip `const` with `CURL_UNCONST()` macro to silence the warning out
  of our control. These happen at API boundaries. Sometimes they depend
  on dependency version, which this patch handles as necessary. Also
  enable const support for the zlib API, using `ZLIB_CONST`. Supported
  by zlib 1.2.5.2 and newer.

- const must be stripped because a curl API requires it.
  Strip `const` with `CURL_UNCONST()` macro to silence the warning out
  of our immediate control. For example we promise to send a non-const
  argument to a callback, though the data is const internally.

- other cases where we may avoid const stripping by code changes.
  Also silenced with `CURL_UNCONST()`.

- there are 3 places where `CURL_UNCONST()` is cast again to const.
  To silence this type of warning:
  ```
  lib/vquic/curl_osslq.c:1015:29: error: to be safe all intermediate
    pointers in cast from 'unsigned char **' to 'const unsigned char **'
    must be 'const' qualified [-Werror=cast-qual]
  lib/cf-socket.c:734:32: error: to be safe all intermediate pointers in
    cast from 'char **' to 'const char **' must be 'const' qualified
    [-Werror=cast-qual]
  ```
  There may be a better solution, but I couldn't find it.

These cases are handled in separate subcommits, but without further
markup.

If you see a `-Wcast-qual` warning in curl, we appreciate your report
about it.

Closes #16142
2025-03-10 22:30:15 +01:00
..
cmake_uninstall.cmake.in cmake: more small tidy-ups and fixes 2024-08-08 13:48:28 +02:00
CMakeConfigurableFile.in copyright: update all copyright lines and remove year ranges 2023-01-03 09:19:21 +01:00
curl-config.cmake.in cmake: drop CURL_USE_PKGCONFIG from curl-config.cmake.in 2025-01-25 15:21:17 +01:00
CurlSymbolHiding.cmake build: add Windows CE / CeGCC support, with CI jobs 2025-02-21 13:56:34 +01:00
CurlTests.c cmake: avoid -Wnonnull warning in HAVE_FSETXATTR_5 detection 2025-02-21 20:53:56 +01:00
FindBearSSL.cmake cmake: document -D and env build options 2024-10-24 23:06:40 +02:00
FindBrotli.cmake build: cmake multi-pkg-config detection improvements (brotli, ldap, mbedtls) 2025-03-07 13:48:07 +01:00
FindCares.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindGSS.cmake cmake: drop redundant opening/closing .* from MATCH expressions 2024-12-20 11:38:59 +01:00
FindLDAP.cmake build: cmake multi-pkg-config detection improvements (brotli, ldap, mbedtls) 2025-03-07 13:48:07 +01:00
FindLibgsasl.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibidn2.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibpsl.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibrtmp.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibssh2.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibssh.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindLibuv.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindMbedTLS.cmake build: cmake multi-pkg-config detection improvements (brotli, ldap, mbedtls) 2025-03-07 13:48:07 +01:00
FindMSH3.cmake cmake: move pkg-config names to Find modules 2024-12-26 12:59:59 +01:00
FindNettle.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindNGHTTP2.cmake cmake: move pkg-config names to Find modules 2024-12-26 12:59:59 +01:00
FindNGHTTP3.cmake cmake: move pkg-config names to Find modules 2024-12-26 12:59:59 +01:00
FindNGTCP2.cmake cmake: move pkg-config names to Find modules 2024-12-26 12:59:59 +01:00
FindQuiche.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindRustls.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindWolfSSH.cmake cmake: clear package version after pkg-config detection 2024-10-25 15:04:35 +02:00
FindWolfSSL.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
FindZstd.cmake cmake/Find: set <Modulename>_FOUND for compatibility when found via pkg-config 2025-02-07 00:07:38 +01:00
Macros.cmake cmake: pre-fill known type sizes for Windows OSes 2025-02-25 16:57:13 +01:00
OtherTests.cmake build: fix compiler warnings in feature detections 2025-02-16 02:39:35 +01:00
PickyWarnings.cmake build: enable -Wcast-qual, fix or silence compiler warnings 2025-03-10 22:30:15 +01:00
unix-cache.cmake cmake: fix detection pre-fills for iOS 2025-03-06 14:01:28 +01:00
Utilities.cmake cmake: add integration tests, run them in CI 2025-02-07 00:15:48 +01:00
win32-cache.cmake windows: do not use winsock2 inet_ntop()/inet_pton() 2025-03-06 20:09:25 +01:00