pa.h (MALLOC_ABI_ALIGNMENT): Set 32-bit alignment default to 64 bits.

	* config/pa.h (MALLOC_ABI_ALIGNMENT): Set 32-bit alignment default to
	64 bits.
	* config/pa/pa32-linux.h (MALLOC_ABI_ALIGNMENT): Set alignment to
	128 bits.

From-SVN: r256773

gcc/ChangeLog

 2018-01-16  John David Anglin  <danglin@gcc.gnu.org>
 
+	* config/pa.h (MALLOC_ABI_ALIGNMENT): Set 32-bit alignment default to
+	64 bits.
+	* config/pa/pa32-linux.h (MALLOC_ABI_ALIGNMENT): Set alignment to
+	128 bits.
+
 	* config/pa/som.h (ASM_DECLARE_FUNCTION_NAME): Cleanup type and mode
 	variables.
 

gcc/config/pa/pa.h

@@ -307,7 +307,7 @@ typedef struct GTY(()) machine_function
    POSIX types such as pthread_mutex_t require 16-byte alignment.  Again,
    this is non critical since 16-byte alignment is no longer needed for
    atomic operations.  */
-#define MALLOC_ABI_ALIGNMENT (TARGET_SOM ? 64 : 128)
+#define MALLOC_ABI_ALIGNMENT (TARGET_64BIT ? 128 : 64)
 
 /* Make arrays of chars word-aligned for the same reasons.  */
 #define DATA_ALIGNMENT(TYPE, ALIGN)		\

gcc/config/pa/pa32-linux.h

@@ -62,3 +62,8 @@ call_ ## FUNC (void)					\
 
 #undef  WCHAR_TYPE_SIZE
 #define WCHAR_TYPE_SIZE BITS_PER_WORD
+
+/* POSIX types such as pthread_mutex_t require 16-byte alignment to retain
+   layout compatibility with the original linux thread implementation.  */
+#undef MALLOC_ABI_ALIGNMENT
+#define MALLOC_ABI_ALIGNMENT 128