我是菜鸟！请大家帮忙！
在主程序编译通过后，我想单独编译名称为readpol.f90的子程序，在Ubuntu linux下输入gfortran readpol.f90后，出现如下错误：
/usr/lib/gcc/i486-linux-gnu/4.4.3/libgfortranbegin.a(fmain.o): In function `main':
(.text+0x27): undefined reference to `MAIN__'
collect2: ld returned 1 exit status
在网上查了相关的资料后，其中有人说：
to fix the above error I needed to attach a -c compiler flag so that an object module was created without a progam. The error message was because the compiler was expecting to find a main program that called this subroutine.
但是如何attach a -c compiler flag 呢？请大家帮忙，谢谢！
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