hello, I wanted to try to learn a little bit more about these builtins ( https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Constructing-Calls.html#index-_005f_005fbuiltin_005fva_005farg_005fpack ) I tried to compile a small example, embedding the one from the documentation: #include <stdio.h> extern int myprintf(FILE *f, const char *format, ...); extern inline __attribute__((__gnu_inline__)) int myprintf(FILE *f, const char *format, ...) { int r = fprintf(f, "myprintf: "); if (r < 0) return r; int s = fprintf(f, format, __builtin_va_arg_pack()); if (s < 0) return s; return r + s; } int main() { myprintf(stdout, "ciao %d\n", 10); return 0; } I try to build with: $ gcc -std=gnu2x -Wall test1.c -o test1 /usr/bin/ld: /tmp/ccrAlevM.o: in function `main': test1.c:(.text+0x27): undefined reference to `myprintf' collect2: error: ld returned 1 exit status make: *** [makefile:88: test1] Error 1 Where am I going wrong? regards Max -- Et nunc, auxilium solis, vincam! Oppugnatio solaris! VIS! Massimiliano Cialdi
