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`-Weverything` is not enabled by curl, and not recommended by LLVM, because it may enable experimental options, and will result in new fallouts after toolchain upgrades. This patch aims to fix/silence as much as possible as found with llvm/clang 21.1.0. It also permanently enables warnings that were fixed in source and deemed manageable in the future. `-Wformat` warnings are addressed separately via #18343. Fix/silence warnings in the source: - typecheck-gcc.h: fix `-Wreserved-identifier`. - lib: silence `-Wcast-function-type-strict`. For llvm 16+ or Apple clang 16+. - asyn-ares: limit `HAPPY_EYEBALLS_DNS_TIMEOUT` to old c-ares versions. - curl_trc: fix `-Wc++-hidden-decl`. - doh: fix `-Wc++-keyword`. - ftp: fix `-Wreserved-identifier`. - ldap: fix `-Wreserved-identifier`. - mqtt: comment unused macro to avoid warning. - multi_ev: drop unused macros to avoid warnings. - setopt: fix useless `break;` after `return;`. - gtls, mbedtls, rustls: silence `-Wconditional-uninitialized`. - socks_sspi, schannel, x509asn1: fix `-Wimplicit-int-enum-cast`. - x509asn1: fix `-Wc++-keyword`. - openssl: scope `OSSL_UI_METHOD_CAST` to avoid unused macro warning. - libssh2, wolfssl: drop unused macros. - curl_ngtcp2, curl_quiche, httpsrr, urlapi: drop/limit unused macros. - tool_getparam: fix useless `break;` after `return;` or `break;`. Not normally enabled because it doesn't work with unity. https://github.com/llvm/llvm-project/issues/71046 - tool_operate: fix `-Wc++-keyword`. - curlinfo: fix a `-Wunsafe-buffer-usage`. - tests: silence `-Wformat-non-iso`. - lib557: fix `-Wreserved-identifier`. - lib1565: silence `-Wconditional-uninitialized`. Enable the above clang warnings permanently in picky mode: - `-Wc++-hidden-decl` - `-Wc++-keyword` (except for Windows, where it collides with `wchar_t`) - `-Wcast-function-type-strict` - `-Wcast-function-type` - `-Wconditional-uninitialized` - `-Wformat-non-iso` (except for clang-cl) - `-Wreserved-identifier` - `-Wtentative-definition-compat` Silence problematic `-Weverything` warnings globally (in picky mode): - `-Wused-but-marked-unused` (88000+ hits) and `-Wdisabled-macro-expansion` (2600+ hits). Triggered by `typecheck-gcc.h` when building with clang 14+. Maybe there exists a way to fix within that header? Ref: https://discourse.llvm.org/t/removing-wused-but-marked-unused/55310 - `-Wunsafe-buffer-usage`. clang 16+. 7000+ hits. May be useful in theory, but such high volume of hits makes it impractical to review and possibly address. Meant for C++. Ref: https://clang.llvm.org/docs/SafeBuffers.html Ref: https://stackoverflow.com/questions/77017567/how-to-fix-code-to-avoid-warning-wunsafe-buffer-usage Ref: https://discourse.llvm.org/t/rfc-c-buffer-hardening/65734 Ref: https://github.com/llvm/llvm-project/pull/111624 - `-Wimplicit-void-ptr-cast`. clang 21+. 1700+ hits. C++ warning, deemed pure noise. Ref: https://github.com/curl/curl/issues/18470#issuecomment-3253506266 - `-Wswitch-default` (180+ hits), `-Wswitch-enum` (190+ hits), `-Wcovered-switch-default` (20+ hits). Next to impossible to fix cleanly, esp. when the covered `case` branches depend on compile-time options. - `-Wdocumentation-unknown-command` (8+ hits). Triggered in a few sources. Seems arbitrary and bogus. - `-Wpadded` (550+ hits). - `-Wc++-keyword` on Windows, where it collides with `wchar_t`. (100+ hits) Ref: https://github.com/llvm/llvm-project/issues/155988 - `-Wreserved-macro-identifier`. clang 13+. 5+ hits. Sometimes it's necessary to set external macros that use the reserved namespace. E.g. `_CRT_NONSTDC_NO_DEPRECATE`, `__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__`, `__NO_NET_API`, possibly `_REENTRANT`, and more. It's not worth trying to silence them individually. - `-Wnonportable-system-include-path` with `clang-cl`. It'd be broken by doing what the warning suggests. - `-Wformat-non-iso` for clang-cl. CMake `PICKY_COMPILER=ON` (the default) or `./configure` `--enable-warnings` (not the default) is required to enable these silencing rules. Also: - autotools, cmake: fix Apple clang and mainline llvm version translations. Ref: https://en.wikipedia.org/wiki/Xcode#Toolchain_versions - autotools, cmake: enable `-Warray-compare` for clang 20+. Follow-up to |
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| .. | ||
| curl.h | ||
| curlver.h | ||
| easy.h | ||
| header.h | ||
| Makefile.am | ||
| mprintf.h | ||
| multi.h | ||
| options.h | ||
| stdcheaders.h | ||
| system.h | ||
| typecheck-gcc.h | ||
| urlapi.h | ||
| websockets.h | ||