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From b8527b8f03c4c50869c4f9a063f5c7686e58e5e9 Mon Sep 17 00:00:00 2001
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From: Jim MacArthur <jim.macarthur@codethink.co.uk>
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Date: Fri, 26 Aug 2016 17:46:05 +0100
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Subject: [PATCH 18/23] Fill in missing array dimensions using the lower bound
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This feature is enabled by the `-fstd=extra-legacy` compiler flag
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---
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0018-Fill-in-missing-array-dimensions-using-the-lower-bou.patch
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diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
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index a831f70..ac35357 100644
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--- a/gcc/fortran/resolve.c
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+++ b/gcc/fortran/resolve.c
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@@ -4396,6 +4396,27 @@ compare_spec_to_ref (gfc_array_ref *ar)
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if (ar->type == AR_FULL)
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return true;
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+ if ((gfc_option.allow_std & GFC_STD_EXTRA_LEGACY)
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+ && as->rank > ar->dimen)
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+ {
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+ /* Add in the missing dimensions, assuming they are the lower bound
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+ of that dimension if not specified. */
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+ int j;
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+ gfc_warning (0, "Using the lower bound for unspecified dimensions "
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+ "in array reference at %L", &ar->where);
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+ /* Other parts of the code iterate ar->start and ar->end from 0 to
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+ ar->dimen, so it is safe to assume slots from ar->dimen upwards
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+ are unused (i.e. there are no gaps; the specified indexes are
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+ contiguous and start at zero */
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+ for(j = ar->dimen; j <= as->rank; j++)
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+ {
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+ ar->start[j] = gfc_copy_expr (as->lower[j]);
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+ ar->end[j] = gfc_copy_expr (as->lower[j]);
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+ ar->dimen_type[j] = DIMEN_ELEMENT;
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+ }
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+ ar->dimen = as->rank;
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+ }
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+
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if (as->rank != ar->dimen)
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{
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gfc_error ("Rank mismatch in array reference at %L (%d/%d)",
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diff --git a/gcc/testsuite/gfortran.dg/array_6.f90 b/gcc/testsuite/gfortran.dg/array_6.f90
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new file mode 100644
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index 0000000..20752a1
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--- /dev/null
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+++ b/gcc/testsuite/gfortran.dg/array_6.f90
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@@ -0,0 +1,13 @@
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+! { dg-do compile }
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+! { dg-options "-std=extra-legacy" }!
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+! Checks that under-specified arrays (referencing arrays with fewer
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+! dimensions than the array spec) generates a warning.
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+!
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+! Contributed by Jim MacArthur <jim.macarthur@codethink.co.uk>
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+!
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+
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+program under_specified_array
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+ INTEGER chsbrd(8,8)
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+ chsbrd(3,1) = 5
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+ print *, chsbrd(3) ! { dg-warning "Using the lower bound for unspecified dimensions in array reference" }
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+end program
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