Making Rust binaries smaller by default(kobzol.github.io)

    #include <stdio.h>
    #include <stdlib.h>
    #include <execinfo.h>
    #include <errno.h>
    
    void print_backtrace(void) {
        void *traces[50];
        char **symbols;
        int num_traces, i;
    
        num_traces = backtrace(traces, sizeof(traces) / sizeof(*traces));
        strings = backtrace_symbols(traces, num_traces);
        if (!strings) return;
        for (i = 0; i < num_traces; ++i) {
            fprintf("%d: %s\n", i + 1, strings[i]);
        }
        free(strings);
    }
    
    int main(void) {
        static const char FMT[] = "Hello, World!\n";
        static int EXPECTED = (int) (sizeof(FMT) - 1);
        int ret = printf(FMT);
        if (ret < 0) {
            fprintf(stderr, "printf failed: %s\n", strerror(errno));
            print_backtrace();
            return 1;
        }
        if (ret != EXPECTED) {
            fprintf(stderr, "printf failed: only %d characters were written\n", ret);
            print_backtrace();
            return 1;
        }
        return 0;
    }

    $ gcc -Os a.c && ls -al a.out && size
    -rwxr-xr-x 1 user user 15952 Jan 24 17:49 a.out
       text    data     bss     dec     hex filename
       1316     584       8    1908     774 a.out
    $ gcc -s -Os a.c && ls -al a.out && size
    -rwxr-xr-x 1 user user 14472 Jan 24 17:50 a.out
       text    data     bss     dec     hex filename
       1316     584       8    1908     774 a.out
    $ gcc -s -Os -fuse-ld=lld a.c && ls -al a.out && size
    -rwxr-xr-x 1 user user 4552 Jan 24 17:50 a.out
       text    data     bss     dec     hex filename
       1199     528       1    1728     6c0 a.out

    zig cc -Os -target x86_64-linux-musl hello.c -o hello