re PR fortran/82143 (add a -fdefault-real-16 flag)

2017-09-26  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/82143
	PR fortran/82324
	* doc/sourcebuild.texi: Document fortran_real_10 and fortran_real_16.

2017-09-26  Janus Weil  <janus@gcc.gnu.org>

	PR fortran/82143
	PR fortran/82324
	* lib/target-supports.exp (check_effective_target_fortran_real_10): New.
	* gfortran.dg/promotion_3.f90: Only run if real(16) is available.
	* gfortran.dg/promotion_4.f90: Only run if real(10) is available.
	Don't assume that DOUBLE PRECISION has kind=16.

From-SVN: r253214

gcc/ChangeLog

+2017-09-26  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/82143
+	PR fortran/82324
+	* doc/sourcebuild.texi: Document fortran_real_10 and fortran_real_16.
+
 2017-09-26  Michael Meissner  <meissner@linux.vnet.ibm.com>
 
 	* config/rs6000/rs6000.md (extendsi<mode>2): Add a splitter to do

gcc/doc/sourcebuild.texi

@@ -1357,6 +1357,12 @@ Target has runtime support for any options added with
 @item fortran_integer_16
 Target supports Fortran @code{integer} that is 16 bytes or longer.
 
+@item fortran_real_10
+Target supports Fortran @code{real} that is 10 bytes or longer.
+
+@item fortran_real_16
+Target supports Fortran @code{real} that is 16 bytes or longer.
+
 @item fortran_large_int
 Target supports Fortran @code{integer} kinds larger than @code{integer(8)}.
 

gcc/testsuite/ChangeLog

+2017-09-26  Janus Weil  <janus@gcc.gnu.org>
+
+	PR fortran/82143
+	PR fortran/82324
+	* lib/target-supports.exp (check_effective_target_fortran_real_10): New.
+	* gfortran.dg/promotion_3.f90: Only run if real(16) is available.
+	* gfortran.dg/promotion_4.f90: Only run if real(10) is available.
+	Don't assume that DOUBLE PRECISION has kind=16.
+
 2017-09-26  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	* gfortran.dg/gomp/associate1.f90: Really commit change

gcc/testsuite/gfortran.dg/promotion_3.f90

 ! { dg-do run }
 ! { dg-options "-fdefault-real-16" }
+! { dg-require-effective-target fortran_real_16 }
 !
 ! PR 82143: add a -fdefault-real-16 flag
 !

gcc/testsuite/gfortran.dg/promotion_4.f90

 ! { dg-do run }
 ! { dg-options "-fdefault-real-10" }
+! { dg-require-effective-target fortran_real_10 }
 !
 ! PR 82143: add a -fdefault-real-16 flag
 !
@@ -12,5 +13,5 @@ double precision :: d
 if (kind(r4) /= 4) call abort
 if (kind(r8) /= 8) call abort
 if (kind(r) /= 10) call abort
-if (kind(d) /= 16) call abort
+if (kind(d)  < 10) call abort
 end

gcc/testsuite/lib/target-supports.exp

@@ -1464,6 +1464,20 @@ proc check_effective_target_fortran_real_16 { } {
     }]
 }
 
+# Return 1 if the target supports Fortran real kind 10,
+# 0 otherwise. Contrary to check_effective_target_fortran_large_real
+# this checks for real(10) only.
+#
+# When the target name changes, replace the cached result.
+
+proc check_effective_target_fortran_real_10 { } {
+    return [check_no_compiler_messages fortran_real_10 executable {
+	! Fortran
+	real(kind=10) :: x
+	x = cos (x)
+	end
+    }]
+}
 
 # Return 1 if the target supports Fortran's IEEE modules,
 # 0 otherwise.