[PATCH] D122895: [C89/C2x] Improve diagnostics around strict prototypes in C
Manoj Gupta via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Sat Apr 30 09:27:10 PDT 2022
manojgupta added a comment.
Tried locally but I still see the warning with -fno-knr-functions. It also says that the argument is unused.
clang version 15.0.0 (https://github.com/llvm/llvm-project.git a9d68a5524dea113cace5983697786599cbdce9a <https://reviews.llvm.org/rGa9d68a5524dea113cace5983697786599cbdce9a>)
$ cat pr.c
$ bin/clang -c pr.c -Wstrict-prototypes -fno-knr-functions
clang-14: warning: argument unused during compilation: '-fno-knr-functions' [-Wunused-command-line-argument]
pr.c:3:9: warning: a function declaration without a prototype is deprecated in all versions of C [-Wstrict-prototypes]
1 warning generated.
It works if -fno-knr-functions is passed with Xclang . Is it intentional that -fno-knr-functions is only a cc1 option? That makes it very hard for us to enable it.
$ bin/clang -c pr.c -Wstrict-prototypes -Xclang -fno-knr-functions (no warnings)
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