[testsuite] Add missing fenv effective target to fp-int-convert-timode* tests.

2019-01-25  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/
	* doc/sourcebuild.texi (Environment attributes): Add fenv and
	fenv_exceptions description.

2019-01-25  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_fenv): New.
	* gcc.dg/torture/fp-int-convert-float128-timode-3.c: Add missing
	fenv effective target.
	* gcc.dg/torture/fp-int-convert-timode-1.c: Likewise.
	* gcc.dg/torture/fp-int-convert-timode-2.c: Likewise.
	* gcc.dg/torture/fp-int-convert-timode-3.c: Likewise.
	* gcc.dg/torture/fp-int-convert-timode-4.c: Likewise.

From-SVN: r268266

gcc/ChangeLog

+2019-01-25  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	* doc/sourcebuild.texi (Environment attributes): Add fenv and
+	fenv_exceptions description.
+
 2019-01-25  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	PR rtl-optimization/87763

gcc/doc/sourcebuild.texi

@@ -2128,6 +2128,13 @@ Target can truncate a file from a file descriptor, as used by
 @file{libgfortran/io/unix.c:fd_truncate}; i.e.@: @code{ftruncate} or
 @code{chsize}.
 
+@item fenv
+Target provides @file{fenv.h} include file.
+
+@item fenv_exceptions
+Target supports @file{fenv.h} with all the standard IEEE exceptions
+and floating-point exceptions are raised by arithmetic operations.
+
 @item freestanding
 Target is @samp{freestanding} as defined in section 4 of the C99 standard.
 Effectively, it is a target which supports no extra headers or libraries

gcc/testsuite/ChangeLog

+2019-01-25  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	* lib/target-supports.exp (check_effective_target_fenv): New.
+	* gcc.dg/torture/fp-int-convert-float128-timode-3.c: Add missing
+	fenv effective target.
+	* gcc.dg/torture/fp-int-convert-timode-1.c: Likewise.
+	* gcc.dg/torture/fp-int-convert-timode-2.c: Likewise.
+	* gcc.dg/torture/fp-int-convert-timode-3.c: Likewise.
+	* gcc.dg/torture/fp-int-convert-timode-4.c: Likewise.
+
 2019-01-25  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/86865

gcc/testsuite/gcc.dg/torture/fp-int-convert-float128-timode-3.c

@@ -4,6 +4,7 @@
 /* { dg-require-effective-target __float128 } */
 /* { dg-require-effective-target base_quadfloat_support } */
 /* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target fenv } */
 /* { dg-options "-frounding-math" } */
 /* { dg-add-options __float128 } */
 

gcc/testsuite/gcc.dg/torture/fp-int-convert-timode-1.c

@@ -2,6 +2,7 @@
    float.  */
 /* { dg-do run } */
 /* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target fenv } */
 /* { dg-options "-frounding-math" } */
 
 #include <fenv.h>

gcc/testsuite/gcc.dg/torture/fp-int-convert-timode-2.c

@@ -2,6 +2,7 @@
    float.  */
 /* { dg-do run } */
 /* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target fenv } */
 /* { dg-options "-frounding-math" } */
 
 #include <fenv.h>

gcc/testsuite/gcc.dg/torture/fp-int-convert-timode-3.c

@@ -2,6 +2,7 @@
    float.  */
 /* { dg-do run } */
 /* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target fenv } */
 /* { dg-options "-frounding-math" } */
 
 #include <fenv.h>

gcc/testsuite/gcc.dg/torture/fp-int-convert-timode-4.c

@@ -2,6 +2,7 @@
    float.  */
 /* { dg-do run } */
 /* { dg-require-effective-target int128 } */
+/* { dg-require-effective-target fenv } */
 /* { dg-options "-frounding-math" } */
 
 #include <fenv.h>

gcc/testsuite/lib/target-supports.exp

@@ -8536,6 +8536,14 @@ proc check_effective_target_avr_tiny { } {
     }
 }
 
+# Return 1 if <fenv.h> is available.
+
+proc check_effective_target_fenv {} {
+    return [check_no_compiler_messages fenv object {
+	#include <fenv.h>
+    } [add_options_for_ieee "-std=gnu99"]]
+}
+
 # Return 1 if <fenv.h> is available with all the standard IEEE
 # exceptions and floating-point exceptions are raised by arithmetic
 # operations.  (If the target requires special options for "inexact"