configure.ac: fix -Wimplicit-function-declaration in HAVE___FUNCTION_… #55
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…_ test (Clang 16) Clang 16 will make -Wimplicit-function-declaration errors by default. ``` error: call to undeclared library function 'printf' with type 'int (const char *, ...)'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] error: call to undeclared library function 'printf' with type 'int (const char *, ...)'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] ``` For more information, see LWN.net [0] or LLVM's Discourse [1], gentoo-dev@ [2], or the (new) c-std-porting mailing list [3]. [0] https://lwn.net/Articles/913505/ [1] https://discourse.llvm.org/t/configure-script-breakage-with-the-new-werror-implicit-function-declaration/65213 [2] https://archives.gentoo.org/gentoo-dev/message/dd9f2d3082b8b6f8dfbccb0639e6e240 [3] hosted at lists.linux.dev. Signed-off-by: Sam James <sam@gentoo.org>
In preparation for C23 which bans these. Signed-off-by: Sam James <sam@gentoo.org>
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…_ test
This breaks with Clang 16 which makes such errors fatal:
Signed-off-by: Sam James sam@gentoo.org