[Issue 23011] New: importC: asm label to set symbol name doesn't work with externs

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=23011

          Issue ID: 23011
           Summary: importC: asm label to set symbol name doesn't work
                    with externs
           Product: D
           Version: D2
          Hardware: All
                OS: Linux
            Status: NEW
          Keywords: ImportC
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: duser at neet.fi
                CC: duser at neet.fi

runnable example (that currently fails):

extern char **myenviron asm("environ");
int myprintf(char *, ...) asm("printf");
int main()
{ 
        void *p = &myenviron;
        myprintf("%p\n", p);
        return 0;
}

works with gcc/clang, gives a link error with dmd

/usr/bin/ld: test.o: in function `main':
test.c:(.text.main[main]+0x7): undefined reference to `myenviron'
/usr/bin/ld: test.c:(.text.main[main]+0x18): undefined reference to `myprintf'
collect2: error: ld returned 1 exit status
Error: linker exited with status 1

it should be linking with the names given in asm()

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