It's out of date so I don't really want to spend long looking into this one. app-arch/dpkg-1.21.1/clang15.log:184:error: call to undeclared library function 'printf' with type 'int (const char *, ...)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration] Please build it with CC=clang-15 and check config.log for "error.*implicit" and investigate the issue.
while bumping I noticed that's it's actual check we want failing: configure:25516: checking for clang-15 options needed to detect all undeclared functions configure:25538: clang-15 -c -O2 -mcpu=power9 -ftree-vectorize -pipe -frecord-gcc-switches -fdiagnostics-show-option -fdiagnostics-color=always conftest.c >&5 ^[[1mconftest.c:73:8: ^[[0m^[[0;1;35mwarning: ^[[0m^[[1mcall to undeclared library function 'strchr' with type 'char *(const char *, int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]^[[0m (void) strchr; ^[[0;1;32m ^ ^[[0m^[[1mconftest.c:73:8: ^[[0m^[[0;1;30mnote: ^[[0minclude the header <string.h> or explicitly provide a declaration for 'strchr'^[[0m > { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CC options needed to detect all undeclared functions" >&5 printf %s "checking for $CC options needed to detect all undeclared functions... " >&6; } if test ${ac_cv_c_undeclared_builtin_options+y} then : printf %s "(cached) " >&6 else $as_nop ac_save_CFLAGS=$CFLAGS ac_cv_c_undeclared_builtin_options='cannot detect' for ac_arg in '' -fno-builtin; do CFLAGS="$ac_save_CFLAGS $ac_arg" # This test program should *not* compile successfully. cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ it fails the same with CFLAGS='-Werror=implicit-function-declaration', yet compiles fine.
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=c3ae0b29591523de6da75104d72fe4bbdb367acb commit c3ae0b29591523de6da75104d72fe4bbdb367acb Author: Georgy Yakovlev <gyakovlev@gentoo.org> AuthorDate: 2022-11-22 06:49:13 +0000 Commit: Georgy Yakovlev <gyakovlev@gentoo.org> CommitDate: 2022-11-22 07:18:56 +0000 app-arch/dpkg: add 1.20.12 fix printf conftest missing include Bug: https://bugs.gentoo.org/869884 Signed-off-by: Georgy Yakovlev <gyakovlev@gentoo.org> app-arch/dpkg/Manifest | 1 + app-arch/dpkg/dpkg-1.20.12.ebuild | 97 +++++++++++++++++++++++++ app-arch/dpkg/files/dpkg-1.20.12-m4-stdio.patch | 25 +++++++ 3 files changed, 123 insertions(+)
as Sam pointed out printf warning was legit. added patch, it should probably work with older versions if needed.
https://github.com/guillemj/dpkg/commit/6ccac302cd1867ece3bf5b0f6da522d326268c1e
