[Issue 10711] shared phobos library should not depend on _Dmain

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10711


Walter Bright <bugzilla at digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla at digitalmars.com


--- Comment #1 from Walter Bright <bugzilla at digitalmars.com> 2013-08-08 00:23:21 PDT ---
To reproduce:

main.c:

    #include <stdio.h>
    #include <stdlib.h>
    #include <dlfcn.h>

    int main()
    {
        printf("+main()\n");

        void *lh = dlopen("/home/walter/tmp/libdll.so", RTLD_LAZY);
        if (!lh)
        {
            fprintf(stderr, "dlopen error: %s\n", dlerror());
            exit(1);
        }
        printf("libdll.so is loaded\n");

        int (*fn)() = dlsym(lh, "dll");
        char *error = dlerror();
        if (error)
        {
            fprintf(stderr, "dlsym error: %s\n", error);
            exit(1);
        }
        printf("dll() function is found\n");

        (*fn)();

        printf("unloading libdll.so\n");
        dlclose(lh);

        printf("-main()\n");
        return 0;
    }

dll.d:

    import core.stdc.stdio;

    extern (C) int dll()
    {
        printf("dll()\n");
        return 0;
    }

    static this()
    {
        printf("libdll.so construction\n");
    }

    static ~this()
    {
        printf("libdll.so destruction\n");
    }

Build:

    dmd -c dll.d -fPIC
    dmd -oflibdll.so dll.o -shared -defaultlib=libphobos2.so
-L-rpath=/home/walter/cbx/mars/phobos/generated/linux/release/64

    gcc -c main.c
    gcc -rdynamic main.o -o main -ldl

    ./main

Results:

    +main()
    dlopen error:
/home/walter/cbx/mars/phobos/generated/linux/release/64/libphobos2.so.0.64:
undefined symbol: _Dmain

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