[cmake-developers] [CMake 0012215]: CMake Not Detecting Basic Fortran Dependencies

[Mantis Bug Tracker]

The following issue has been SUBMITTED. 
====================================================================== 
http://www.vtk.org/Bug/view.php?id=12215 
====================================================================== 
Reported By:                Mohamad Sindi
Assigned To:                
====================================================================== 
Project:                    CMake
Issue ID:                   12215
Category:                   CMake
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
====================================================================== 
Date Submitted:             2011-05-23 13:54 AST
Last Modified:              2011-05-23 13:54 AST
====================================================================== 
Summary:                    CMake Not Detecting Basic Fortran Dependencies
Description: 
I have the below directory structure for Fortran code which has very basic
dependencies, yet CMake seems to fail to recognize the dependencies:

src/

    CMakeLists.txt

    lib1/CMakeLists.txt
    lib1/lib1.f

    lib2/CMakeLists.txt
    lib2/lib2.f

    lib3/CMakeLists.txt
    lib3/lib3.f

    main/CMakeLists.txt
    main/myMain.f


Dependencies are:
myMain uses lib3
lib3   uses lib2
lib2   uses lib1


My top directory CMakeLists.txt looks like this:
[sindimo at lnx src]$ cat CMakeLists.txt
CMAKE_MINIMUM_REQUIRED (VERSION 2.8)
PROJECT(Fortran-Example-Dependency-Failure Fortran)

INCLUDE_DIRECTORIES(/workspace/Fortran-Example-Dependency-Failure/obj/linux_gnu_release_64-bit)

set (EXECUTABLE_OUTPUT_PATH
"/workspace/Fortran-Example-Dependency-Failure/bin/linux_gnu_release_64-bit")
set (LIBRARY_OUTPUT_PATH
"/workspace/Fortran-Example-Dependency-Failure/obj/linux_gnu_release_64-bit")
set (CMAKE_Fortran_MODULE_DIRECTORY
"/workspace/Fortran-Example-Dependency-Failure/obj/linux_gnu_release_64-bit")

ADD_SUBDIRECTORY(lib3)
ADD_SUBDIRECTORY(lib2)
ADD_SUBDIRECTORY(lib1)
ADD_SUBDIRECTORY(main)


The subdirectory CMakeLists.txt files look like:
[sindimo at lnx src]$ cat lib1/CMakeLists.txt 
ADD_LIBRARY(lib1 SHARED  lib1.f)

[sindimo at lnx src]$ cat lib2/CMakeLists.txt
ADD_LIBRARY(lib2 SHARED  lib2.f)

[sindimo at lnx src]$ cat lib3/CMakeLists.txt
ADD_LIBRARY(lib3 SHARED  lib3.f)

[sindimo at lnx src]$ cat main/CMakeLists.txt 
ADD_EXECUTABLE(Fortran-Example-Dependency-Failure.exe  myMain.f)
TARGET_LINK_LIBRARIES(Fortran-Example-Dependency-Failure.exe  lib1 lib2 lib3)


When I run cmake followed by make I get the below error which apparently seems
to be due to CMake not figuring out the correct dependencies in Fortran and
doing the wrong build sequence:
[sindimo at lnx build_linux_gnu_release_64-bit]$ cmake ../src
-- The CXX compiler identification is GNU
-- The Fortran compiler identification is GNU
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working Fortran compiler: /usr/bin/gfortran
-- Check for working Fortran compiler: /usr/bin/gfortran  -- works
-- Detecting Fortran compiler ABI info
-- Detecting Fortran compiler ABI info - done
-- Checking whether /usr/bin/gfortran supports Fortran 90
-- Checking whether /usr/bin/gfortran supports Fortran 90 -- yes
-- Configuring done
-- Generating done
-- Build files have been written to:
/workspace/Fortran-Example-Dependency-Failure/build_linux_gnu_release_64-bit

[sindimo at lnx build_linux_gnu_release_64-bit]$ make
Scanning dependencies of target lib3
[ 25%] Building Fortran object lib3/CMakeFiles/lib3.dir/lib3.f.o
 In file /workspace/Fortran-Example-Dependency-Failure/src/lib3/lib3.f:6

            use m_lib2                                                  
                                                                       1
Fatal Error: Can't open module file 'm_lib2.mod' for reading at (1): No such
file or directory
make[2]: *** [lib3/CMakeFiles/lib3.dir/lib3.f.o] Error 1
make[1]: *** [lib3/CMakeFiles/lib3.dir/all] Error 2
make: *** [all] Error 2


To my understanding CMake should be able to handle such simple Fortran
dependencies (as I recall, it uses similar intelligence to that of makedepf90),
am I doing something wrong here or is this considered too complicated of a
Fortran dependency for CMake to handle?

As a work around, if I add the below dependency statements manually to the top
level CMakeLists.txt file, things go well:
ADD_DEPENDENCIES(lib2 lib1)
ADD_DEPENDENCIES(lib3 lib2)

Also if I sort the ADD_SUBDIRECTORY commands in the correct build sequence, that
obviously solves the problem as well.

However our actual application that we need to use CMake with consists of
hundreds of libraries, so adding these dependencies manually or sorting them in
the correct build sequence is not feasible.

The "Mastering CMake" 4th edition book mentions an "output_required_files"
command which should take a source file and produce a list of all other source
file it depends on. So far I tried it with Fortran source files and it didn't
work, it basically creates an empty file which supposedly should contain a list
of source file dependencies. I've posted the below link regarding this:
http://www.vtk.org/Bug/view.php?id=12214 

I've attached the code for this along with the CMake configuration files.

I would appreciate any feed back or help with this.

Many thanks!

Mohamad Sindi
Saudi Aramco
EXPEC Advanced Research Center

Steps to Reproduce: 
See description for details.
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Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2011-05-23 13:54 Mohamad Sindi  New Issue                                    
2011-05-23 13:54 Mohamad Sindi  File Added:
Fortran-Example-Dependency-Failure.zip                    
======================================================================