arm.c (arm_option_override): Deprecate use of -mstructure-size-boundary.

2017-07-23  Michael Collison  <michael.collison@arm.com>

	* config/arm/arm.c (arm_option_override): Deprecate
	use of -mstructure-size-boundary.
	* config/arm/arm.opt: Deprecate -mstructure-size-boundary.
	* doc/invoke.texi: Deprecate -mstructure-size-boundary.

From-SVN: r250465

gcc/ChangeLog

+2017-07-23  Michael Collison  <michael.collison@arm.com>
+
+	* config/arm/arm.c (arm_option_override): Deprecate
+	use of -mstructure-size-boundary.
+	* config/arm/arm.opt: Deprecate -mstructure-size-boundary.
+	* doc/invoke.texi: Deprecate -mstructure-size-boundary.
+
 2017-07-23  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	PR target/80695

gcc/config/arm/arm.c

@@ -3489,6 +3489,8 @@ arm_option_override (void)
     }
   else
     {
+      warning (0, "option %<-mstructure-size-boundary%> is deprecated");
+
       if (arm_structure_size_boundary != 8
 	  && arm_structure_size_boundary != 32
 	  && !(ARM_DOUBLEWORD_ALIGN && arm_structure_size_boundary == 64))

gcc/config/arm/arm.opt

@@ -192,7 +192,7 @@ Target RejectNegative Alias(mfloat-abi=, soft) Undocumented
 
 mstructure-size-boundary=
 Target RejectNegative Joined UInteger Var(arm_structure_size_boundary) Init(DEFAULT_STRUCTURE_SIZE_BOUNDARY)
-Specify the minimum bit alignment of structures.
+Specify the minimum bit alignment of structures. (Deprecated).
 
 mthumb
 Target Report RejectNegative Negative(marm) Mask(THUMB) Save

gcc/doc/invoke.texi

@@ -15714,6 +15714,8 @@ incompatible.  Code compiled with one value cannot necessarily expect to
 work with code or libraries compiled with another value, if they exchange
 information using structures or unions.
 
+This option is deprecated.
+
 @item -mabort-on-noreturn
 @opindex mabort-on-noreturn
 Generate a call to the function @code{abort} at the end of a