Ubuntu 20.04下如何编译安装Fortran的FLIBS？——接口匹配错误问题求助

I’ve run into identical intent mismatch issues with FLIBS on newer GCC versions (like the gfortran 9.x included in Ubuntu 20.04) — here’s how to resolve this and compile FLIBS correctly:

Step 1: Ensure All Dependencies Are Installed #

First, make sure your system has the necessary build tools to compile Fortran code:

sudo apt update && sudo apt install gfortran make gcc

Step 2: Re-Run the Configuration Script #

Navigate back to your FLIBS root directory and re-run the configure script to ensure it detects your compiler settings properly:

cd /path/to/your/flibs
./configure.sh

Step 3: Fix the Intent Mismatch in m_vstringlist.f90 #

The errors you’re seeing stem from stricter interface checking in modern gfortran versions. The qsort_array subroutine expects comparison functions to take arguments with INTENT(IN), but some functions in m_vstringlist.f90 lack this specification.

• Open the file src/strings/m_vstringlist.f90 in your preferred text editor:

  nano src/strings/m_vstringlist.f90
  

• Locate all 8 comparison functions listed in your error messages (e.g., vstrlist_compare_asciiincreasing, vstrlist_compare_asciidecreasing). Each will look similar to this:

  function vstrlist_compare_asciiincreasing(a,b) result(res)
    type(vstring) :: a, b
    integer :: res
    ! ... existing function body ...
  end function
  

• Add INTENT(IN) to both dummy arguments for each comparison function:

  function vstrlist_compare_asciiincreasing(a,b) result(res)
    type(vstring), intent(in) :: a, b
    integer :: res
    ! ... existing function body ...
  end function
  

Repeat this adjustment for all 8 comparison functions.

Step 4: Recompile FLIBS #

Clean any previous build artifacts and recompile the library:

cd make
make clean
make

Step 5: Verify the Compiled Libraries #

After a successful compile, you’ll find the required modules (cgi_protocol.mod, fcgi_protocol.mod) in the lib/linux/x86_64/gfortran/debug (or release) directory of your FLIBS installation. You can now link these modules to your Fortran script.

This fix aligns the comparison functions with the interface expected by qsort_array, which is mandatory for compatibility with newer gfortran versions.

内容的提问来源于stack exchange，提问作者John C.