PR 84615 Regressions due to type mismatch with character functions

Since the kind of the hidden character length variable is not part of
the character variable definition, we must ensure that character
lengths are always of the same kind in interfaces, regardless of how
they were declared in the source. This patch ensures this when calling
a procedure.

Regtested on x86_64-pc-linux-gnu and i686-pc-linux-gnu.

gcc/fortran/ChangeLog:

2018-03-21  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/84615
	* trans-expr.c (gfc_conv_procedure_call): Convert charlen to
	gfc_charlen_type_node when calling procedure.

gcc/testsuite/ChangeLog:

2018-03-21  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/84615
	* gfortran.dg/char_result_17.f90: New test.

From-SVN: r258736

4 files changed, 38 insertions, 3 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index 8bcaabb..b69b559 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,8 +1,14 @@
+2018-03-21  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR fortran/84615
+	* trans-expr.c (gfc_conv_procedure_call): Convert charlen to
+	gfc_charlen_type_node when calling procedure.
+
 2018-03-20  Steven G. Kargl  <kargl@gcc.gnu.org>
 
 	PR fortran/85001
 	* interface.c (symbol_rank): Remove bogus null pointer check that
-	crept in when translating a ternary operator into an if-else 
+	crept in when translating a ternary operator into an if-else
 	constructor.
 
 2018-03-19  Thomas Koenig  <tkoenig@gcc.gnu.org>
diff --git a/gcc/fortran/trans-expr.c b/gcc/fortran/trans-expr.c
index 54bda1d..8bf5504 100644
--- a/gcc/fortran/trans-expr.c
+++ b/gcc/fortran/trans-expr.c
@@ -5973,9 +5973,13 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym,
 	  gfc_add_block_to_block (&se->pre, &parmse.pre);
 	  gfc_add_block_to_block (&se->post, &parmse.post);
 	  tmp = parmse.expr;
+	  /* TODO: It would be better to have the charlens as
+	     gfc_charlen_type_node already when the interface is
+	     created instead of converting it here (see PR 84615).  */
 	  tmp = fold_build2_loc (input_location, MAX_EXPR,
-				 TREE_TYPE (tmp), tmp,
-				 build_zero_cst (TREE_TYPE (tmp)));
+				 gfc_charlen_type_node,
+				 fold_convert (gfc_charlen_type_node, tmp),
+				 build_zero_cst (gfc_charlen_type_node));
 	  cl.backend_decl = tmp;
 	}
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5d25d56..43122bb 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-21  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR fortran/84615
+	* gfortran.dg/char_result_17.f90: New test.
+
 2018-03-21  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/84994
diff --git a/gcc/testsuite/gfortran.dg/char_result_17.f90 b/gcc/testsuite/gfortran.dg/char_result_17.f90
new file mode 100644
index 0000000..05ab72d
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/char_result_17.f90
@@ -0,0 +1,20 @@
+! { dg-do run }
+! PR fortran/84615
+! Charlen should always be the ABI defined character length type
+! regardless of which kind it is declared as in the source.
+program TestStringTools
+  character(len=52)               :: txt
+  character(len=1), dimension(52) :: chararr = &
+       (/(char(i+64),char(i+96), i = 1,26)/)
+  txt = chararray2string(chararr)
+  if (txt .ne. "AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz") &
+       STOP 1
+contains
+  function chararray2string(chararray) result(text)
+    character(len=1), dimension(:) :: chararray    ! input
+    character(len=int(size(chararray, 1), kind=8)) :: text      ! output
+    do i = 1,size(chararray,1)
+       text(i:i) = chararray (i)
+    end do
+  end function chararray2string
+end program TestStringTools