pawosm-arm wrote: > @pawosm-arm See also > https://wiki.gentoo.org/wiki/Project:Quality_Assurance/As-needed#Importance_of_linking_order. > It is common for distributions to enable `-Wl,--as-needed` via patches to > the compiler or configuration files.
Indeed, the distributions couldn't avoid this annoying behavior of clang (spitting `undefined reference to `main'`) when started without any command line params: ``` $ clang /usr/bin/x86_64-pc-linux-gnu-ld.bfd: /usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../lib64/Scrt1.o: in function `_start': (.text+0x17): undefined reference to `main' clang: error: linker command failed with exit code 1 (use -v to see invocation) $ clang --no-default-config clang: error: no input files $ clang -### clang version 18.1.8 Target: x86_64-pc-linux-gnu Thread model: posix InstalledDir: /usr/lib/llvm/18/bin Configuration file: /etc/clang/x86_64-pc-linux-gnu-clang.cfg "/usr/bin/x86_64-pc-linux-gnu-ld.bfd" "--hash-style=gnu" "--eh-frame-hdr" "-m" "elf_x86_64" "-pie" "-dynamic-linker" "/lib64/ld-linux-x86-64.so.2" "-o" "a.out" "/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../lib64/Scrt1.o" "/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../lib64/crti.o" "/usr/lib/gcc/x86_64-pc-linux-gnu/14/crtbeginS.o" "-L/usr/lib/gcc/x86_64-pc-linux-gnu/14" "-L/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../lib64" "-L/lib/../lib64" "-L/usr/lib/../lib64" "-L/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../x86_64-pc-linux-gnu/lib" "-L/lib" "-L/usr/lib" "-z" "relro" "-z" "now" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "-lc" "-lgcc" "--as-needed" "-lgcc_s" "--no-as-needed" "/usr/lib/gcc/x86_64-pc-linux-gnu/14/crtendS.o" "/usr/lib/gcc/x86_64-pc-linux-gnu/14/../../../../lib64/crtn.o" $ cat /etc/clang/x86_64-pc-linux-gnu-clang.cfg # This configuration file is used by x86_64-pc-linux-gnu-clang driver. @gentoo-common.cfg @gentoo-common-ld.cfg @gentoo-cet.cfg` ``` https://github.com/llvm/llvm-project/pull/117573 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
