[Bug 202] New: Undefined reference to libcurl functions with small program

[via D.gnu]

http://bugzilla.gdcproject.org/show_bug.cgi?id=202

            Bug ID: 202
           Summary: Undefined reference to libcurl functions with small
                    program
           Product: GDC
           Version: development
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gdc
          Assignee: ibuclaw at gdcproject.org
          Reporter: sebastien.alaiwan at gmail.com

The following program fails to link:

// cantlink.d
int main() { return 0; }

void f()
{
  import std.conv;
  import std.stdio;

  File input;
  foreach(line; input.byLine())
  {
    to!int(line);
  }
}

$ gdc cantlink.d
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl4Curl18_sharedStaticCtor2FZv':
/build/gcc-5-HN3UpE/gcc-5-5.2.1/build/x86_64-linux-gnu/libphobos/src/../../../../src/libphobos/src/std/net/curl.d:3498:
undefined reference to `curl_global_init'
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl4Curl8shutdownMFZv':
/build/gcc-5-HN3UpE/gcc-5-5.2.1/build/x86_64-linux-gnu/libphobos/src/../../../../src/libphobos/src/std/net/curl.d:3634:
undefined reference to `curl_easy_cleanup'
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl4HTTP4Impl6__dtorMFZv':
/build/gcc-5-HN3UpE/gcc-5-5.2.1/build/x86_64-linux-gnu/libphobos/src/../../../../src/libphobos/src/std/net/curl.d:2049:
undefined reference to `curl_slist_free_all'
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl4Curl8shutdownMFZv':
/build/gcc-5-HN3UpE/gcc-5-5.2.1/build/x86_64-linux-gnu/libphobos/src/../../../../src/libphobos/src/std/net/curl.d:3634:
undefined reference to `curl_easy_cleanup'
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl3FTP4Impl6__dtorMFZv':
/build/gcc-5-HN3UpE/gcc-5-5.2.1/build/x86_64-linux-gnu/libphobos/src/../../../../src/libphobos/src/std/net/curl.d:2817:
undefined reference to `curl_slist_free_all'
/usr/lib/gcc/x86_64-linux-gnu/5/libgphobos2.a(curl.o): In function
`_D3std3net4curl4Curl8shutdownMFZv':
....


However, the following program links fine:

// linksfine.d
int main() { return 0; }

void f()
{
  import std.conv;
  import std.stdio;

  File input;
  foreach(line; input.byLine())
  {
  }
}

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