> Jerry Xue wrote:

>> I got the problem. In the makefile, I put the *.o files that are only
>> called by the main program when I specify the dependency. But I forget
>> to put the *.o files that some of the *.o files need.
>> i.e. The following is wrong eventhough the main.f95 only called sub1.o
>> =============================
>> mainprog : main.f95 sub1.o
>> g95 -o mainprog main.f95 sub1.o
>> =============================
>> the right one should be the following, since the sub1.o needs to call
>> sub2.o sub3.o
>> =============================
>> mainprog : main.f95 sub1.o sub2.o sub3.o
>> g95 -o mainprog main.f95 sub1.o sub2.o sub3.o
>> sub1.o : sub1.f95
>> g95 -c sub1.f95
>> sub2.o : sub2.f95
>> g95 -c sub2.f95
>> sub3.o : sub3.f95
>> g95 -c sub3.f95
>> clean:
>> rm -f *.o
>> ============================
>> Richard Maine wrote:
>>

>>> Jerry Xue purdue.edu> wrote:
>>>
>>>
>>>

>>>> Source files, sub1, sub2 and sub3 are subroutine files. I use gnu
>>>> make to
>>>> arrange the compilation. However, I got dependency problem such as:
>>>> --------------------------------------------------------------------------
>>>>
>>>> ub1.f95:(.text+0x27a): undefined reference to `sub2_'
>>>> sub1.f95:(.text+0x27f): undefined reference to `sub3_'
>>>>

>>>
>>> Ok. Yes, with g95 use the -c switch as I showed in order to stop after
>>> making just the .o file. Without the -c switch, the compiler tries to
>>> then link the sub1.o file into an executable, which doesn't work because
>>> it doesn't have all the parts. The -c switch tells it to not do that. It
>>> will make just the sub1.o, which you'll later have to link in with all
>>> the other relevant parts (including a main program, somewhere or other).
>>>
>>>
>>>

> I don't know Fortran 95, I only use Fortran 77. But If a source code of
> my program is divided in many files I use INCLUDE.

>
> For example:
> My program files are:
> file1.f, file2.f (Subroutines or functions)
> main.for.(main program)
>
> In file main.for I write
>
> INCLUDE 'file1.f'
> INCLUDE 'file2.f'
>
> PROGRAM main
> IMPLICIT NONE
> ...
>
> STOP
> END
>
> compilation:
>
> e.g. g77 main.for -o main.out
>
> If I use INCLUDE the compiler checks also COMMON dependencies, what is
> very usefull.
>
> Sorry for my english
>
> Zuczek
>