OpenEuphoria

Errors using multiple euphoria shared libraries

• Posted by raseu May 24, 2012
• 1011 views

eui Linux Version (Linux Ubuntu)

Euphoria Interpreter v4.1.0 development
32-bit Linux, Using System Memory
Revision Date: unknown, Id: 0:unknown

eui windows Version

Euphoria Interpreter v4.1.0 development
32-bit Windows, Using System Memory
Revision Date: unknown, Id: 0:unknown

Using the above version of euphoria under linux, there are issues regarding the
execution of exported routines when multiple euphoria libraries are loaded
within a program.

Given the following two programs compiled as euphoria shared libraries

--// compile as shared library 
--// 
--// $ euc -so lib1.e 
include std/os.e 
 
export procedure lib1_export() 
   printf(1, "inside lib1_export()\n") 
end procedure 

and

--// compile as shared library 
--// 
--// $ euc -so lib2.e 
include std/os.e 
 
export procedure lib2_export() 
   printf(1, "inside lib2_export()\n") 
end procedure 

and the following test program

--// run 
--// 
--// $ eui test.ex 
include std/dll.e 
include std/machine.e 
 
ifdef WINDOWS then 
   constant lib1 = open_dll("lib1.dll") 
   constant lib2 = open_dll("lib2.dll") 
elsedef 
   constant lib1 = open_dll("lib1.so") 
   constant lib2 = open_dll("lib2.so") 
end ifdef 
 
   constant lib1_export = define_c_proc(lib1, "lib1_export", {}) 
   constant lib2_export = define_c_proc(lib2, "lib2_export", {}) 
 
   ? { lib1, lib2, lib1_export, lib2_export } 
 
   c_proc(lib1_export, {}) 
   c_proc(lib2_export, {}) 

Windows provides the following output as expected

{7733248,31588352,28,29}
inside lib1_export()
inside lib2_export()

Linux provides the following undesired output

{139554136,139234544,19,20}
inside lib1_export()
inside lib1_export()

Is this a euphoria issue under linux?, or an issue with the way
linux loads shared libraries with all symbols exported as default?

I am guessing that because both shared libraries under linux share
a lot of underlying euphoria library routines that the system cannot
resolve linkage definitions correctly?