[patch, fortran] Fix PR 54033, problems with -I, with test cases

[Tobias Burnus]

On 08/02/2012 10:54 AM, Richard Guenther wrote:
> Seems to break testing, all testcases emit
>
> Warning: Nonexistent include directory "finclude"^M
>
> now and thus all testcases fail like
>
> FAIL: gfortran.dg/alloc_comp_basics_1.f90  -O0  (test for excess errors)

First, I actually wonder why it only lists "finclude" and not the full 
pathname.

I think the problem is that gfortran (the driver) passes something like
    -fintrinsic-modules-path 
/$PREFIX/lib64/gcc/x86_64-unknown-linux-gnu/4.8.0/finclude
to the actual compiler (f951).

That directory only exists if the compiler is installed but not if one 
runs the test suite without installing it. I wonder how the OpenMP tests 
handle it - there one needs the files from that directory. (It currently 
contains the following files: omp_lib.f90 omp_lib.h  omp_lib_kinds.mod  
omp_lib.mod.) Answer: Theose seemingly include "$BUILD/$triplet/libgomp" 
in the -I path, which also contain those files. (That probably clashes 
with "use, intrinsic :: omp_lib", but that shouldn't matter.)

I am not sure whether it is the best solution, but one possibility would 
be to ignore -fintrinsic-modules-path for the warning. (That assumes 
that the warning is (almost) never needed for an installed compiler.)

Tobias