Fortran模块变量无法在调试器中访问 [英] Fortran module variables not accessible in debuggers

问题描述

我编译了一个Fortran代码，它包含几个模块，同时使用gfortran 4.4和intel 11.1，随后尝试使用gdb和DDT进行调试。在所有情况下，我都看不到在模块中声明的任何变量的值。这些全局变量具有值，因为代码仍然正常运行，但我看不到在调试器中的值。局部变量很好。我很难在其他地方找到解决方案，所以也许没有简单的解决方案，但如果我看不到任何全局变量的值，那么调试我的代码将会非常困难。对于更新的GDB（7.2，如果我正确记得），调试模块很简单。以下程序：

  module modname 
 integer :: var1 = 1，var2 = 2 
 end模块modname 
 
使用modname，仅：newvar => var2 
 newvar = 7 
 end 
  

您现在可以运行：

  $ gfortran -g -o mytest test.f90; gdb --quiet ./mytest 
从/dev/shm/mytest...done读取符号。 
（gdb）b 6 
 0x4006a0的断点1：file test.f90，第6行。
（gdb）run 
启动程序：/ dev / shm / mytest 
断点1，MAIN__（）在test.f90：6 
 6 newvar = 7 
（gdb）p newvar 
 $ 1 = 2 
（gdb）p var1 
在当前上下文中没有符号var1。 
（gdb）p modname :: var1 
 $ 2 = 1 
（gdb）p modname :: var2 
 $ 3 = 2 
（gdb）n 
 7结束
（gdb）p modname :: var2 
 $ 4 = 7 
（gdb）
  

I've compiled a Fortran code, which contains several modules, using both gfortran 4.4 and intel 11.1 and subsequently tried to debug it using both gdb and DDT. In all cases, I cannot see the values of any variables that are declared in modules. These global variables have values, as the code still runs correctly, but I can't see what the values are in my debuggers. Local variables are fine. I've had trouble finding a solution to this problem elsewhere online, so perhaps there is no straightforward solution, but it's going to be really difficult to debug my code if I can't see the values of any of my global variables.

解决方案

With newer GDBs (7.2 if I recall correctly), debugging modules is simple. Take the following program:

module modname
  integer :: var1 = 1 , var2 = 2
end module modname

use modname, only: newvar => var2
newvar = 7
end

You can now run:

$ gfortran -g -o mytest test.f90; gdb --quiet ./mytest
Reading symbols from /dev/shm/mytest...done.
(gdb) b 6
Breakpoint 1 at 0x4006a0: file test.f90, line 6.
(gdb) run
Starting program: /dev/shm/mytest
Breakpoint 1, MAIN__ () at test.f90:6
6       newvar = 7
(gdb) p newvar
$1 = 2
(gdb) p var1
No symbol "var1" in current context.
(gdb) p modname::var1
$2 = 1
(gdb) p modname::var2
$3 = 2
(gdb) n
7       end
(gdb) p modname::var2
$4 = 7
(gdb)

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