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digitalmars.D.learn - How do I fix the spawnvp link bug under Linux?

reply Grzegorz Adam Hankiewicz <gradhanews ya.com> writes:
I'm having trouble creating a binary from this source:

  import std.stdio;
  import std.process;
  
  int main()
  {
      writefln("Hello world! I'm going to run something!");
      system("something");
      return 0;
  }

  $ dmd hello.d
  gcc hello.o -o hello -lphobos -lpthread -lm 
  /usr/local/lib/libphobos.a(process.o): In function
`_D3std7process7spawnvpFiAaAAaZi':
  std/process.d:(.gnu.linkonce.t_D3std7process7spawnvpFiAaAAaZi+0x44):
undefined reference to `spawnvp'
  collect2: ld returned 1 exit status
  --- errorlevel 1

Googling for "phobos spawnvp" just shows a message that this was
introduced on dmd 0.113, John R. acknowledged this as a bug, but
I'm using 0.141 and still get the same error. Is this going to be
fixed in a future release of dmd or do I have to get dirty and do it
myself? In which case, what do I have to do? The messages found by
Google don't show any step by step instructions on how to fix this.
Dec 28 2005
next sibling parent reply BCS <BCS_member pathlink.com> writes:
In article <pan.2005.12.28.22.01.42.983469 ya.com>, Grzegorz Adam Hankiewicz
says...

I'm having trouble creating a binary from this source:

  import std.stdio;
  import std.process;
  
  int main()
  {
      writefln("Hello world! I'm going to run something!");
      system("something");
      return 0;
  }

  $ dmd hello.d
  gcc hello.o -o hello -lphobos -lpthread -lm 
  /usr/local/lib/libphobos.a(process.o): In function
`_D3std7process7spawnvpFiAaAAaZi':
  std/process.d:(.gnu.linkonce.t_D3std7process7spawnvpFiAaAAaZi+0x44):
undefined reference to `spawnvp'
  collect2: ld returned 1 exit status
  --- errorlevel 1

Googling for "phobos spawnvp" just shows a message that this was
introduced on dmd 0.113, John R. acknowledged this as a bug, but
I'm using 0.141 and still get the same error. Is this going to be
fixed in a future release of dmd or do I have to get dirty and do it
myself? In which case, what do I have to do? The messages found by
Google don't show any step by step instructions on how to fix this.


I've never ben quite sure what was happening with this error but it always seems
to have something to do with getting the right libraries passed to gcc.

try this:

gcc hello.o -o hello <path_to_dmd>/lib/libphobos.a -lpthread -lm
Dec 28 2005
parent Grzegorz Adam Hankiewicz <gradhanews ya.com> writes:
El Wed, 28 Dec 2005 23:11:02 +0000, BCS escribió:

  $ dmd hello.d
  gcc hello.o -o hello -lphobos -lpthread -lm 
  /usr/local/lib/libphobos.a(process.o): In function
`_D3std7process7spawnvpFiAaAAaZi':
  std/process.d:(.gnu.linkonce.t_D3std7process7spawnvpFiAaAAaZi+0x44):
undefined reference to `spawnvp'
  collect2: ld returned 1 exit status
  --- errorlevel 1


[...]
 
 try this:
 
 gcc hello.o -o hello <path_to_dmd>/lib/libphobos.a -lpthread -lm


Same result. Unsurprising, since libphobos.a doesn't include any
spawnvp code:

  [~/test/dmd/dmd/lib]$ nm libphobos.a |grep spawnvp
  00000000 T _D3std7process7spawnvpFiAaAAaZi
           U spawnvp
Dec 29 2005
prev sibling next sibling parent reply Carlos Santander <csantander619 gmail.com> writes:
Grzegorz Adam Hankiewicz escribió:

 I'm having trouble creating a binary from this source:
 
   import std.stdio;
   import std.process;
   
   int main()
   {
       writefln("Hello world! I'm going to run something!");
       system("something");
       return 0;
   }
 
   $ dmd hello.d
   gcc hello.o -o hello -lphobos -lpthread -lm 
   /usr/local/lib/libphobos.a(process.o): In function
`_D3std7process7spawnvpFiAaAAaZi':
   std/process.d:(.gnu.linkonce.t_D3std7process7spawnvpFiAaAAaZi+0x44):
undefined reference to `spawnvp'
   collect2: ld returned 1 exit status
   --- errorlevel 1
 
 Googling for "phobos spawnvp" just shows a message that this was
 introduced on dmd 0.113, John R. acknowledged this as a bug, but
 I'm using 0.141 and still get the same error. Is this going to be
 fixed in a future release of dmd or do I have to get dirty and do it
 myself? In which case, what do I have to do? The messages found by
 Google don't show any step by step instructions on how to fix this.
 


Open std/process.d and std/c/process.d, and put version(Windows) around 
everything that starts with spawn. Then, recompile Phobos and copy it 
(libphobos.a) to the appropiate directory.

-- 
Carlos Santander Bernal
Dec 28 2005
parent Grzegorz Adam Hankiewicz <gradhanews ya.com> writes:
El Wed, 28 Dec 2005 22:16:06 -0500, Carlos Santander escribió:

 Open std/process.d and std/c/process.d, and put version(Windows)
 around everything that starts with spawn. Then, recompile Phobos
 and copy it (libphobos.a) to the appropiate directory.


Thanks, that fixes it.
Dec 29 2005
prev sibling parent John Reimer <terminal.node gmail.com> writes:
spawnvp doesn't exist on linux.

see:

http://www.digitalmars.com/d/archives/digitalmars/D/bugs/2994.html

Carlos has the solution. :)
Dec 29 2005