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PATCH: Simplify TRY_EMPTY_VM_SPACE for Linux hosts


Hi,

This patch simplifies TRY_EMPTY_VM_SPACE for Linux hosts by checking
pointer size when appropriate.  Tested on Linux/x86-64, Linux/ia32
and Linux/x32.  OK for trunk?

Thanks.

H.J.
---
2012-04-11  H.J. Lu  <hongjiu.lu@intel.com>

	* config/host-linux.c (TRY_EMPTY_VM_SPACE): Check pointer size
	for alpha, arm, i386 and x86-64.

diff --git a/gcc/config/host-linux.c b/gcc/config/host-linux.c
index b535758..93c513e 100644
--- a/gcc/config/host-linux.c
+++ b/gcc/config/host-linux.c
@@ -64,16 +64,12 @@
 
 /* For various ports, try to guess a fixed spot in the vm space
    that's probably free.  */
-#if defined(__alpha)
-# define TRY_EMPTY_VM_SPACE	0x10000000000
+#if defined(__alpha) || defined(__ARM_EABI__) || defined(__i386) \
+    || defined(__x86_64)
+# define TRY_EMPTY_VM_SPACE	\
+  (sizeof (void *) == 8 ? 0x1000000000 : 0x60000000)
 #elif defined(__ia64)
 # define TRY_EMPTY_VM_SPACE	0x2000000100000000
-#elif defined(__x86_64) && defined(__LP64__)
-# define TRY_EMPTY_VM_SPACE	0x1000000000
-#elif defined(__x86_64)
-# define TRY_EMPTY_VM_SPACE	0x60000000
-#elif defined(__i386)
-# define TRY_EMPTY_VM_SPACE	0x60000000
 #elif defined(__powerpc__)
 # define TRY_EMPTY_VM_SPACE	0x60000000
 #elif defined(__s390x__)
@@ -86,8 +82,6 @@
 # define TRY_EMPTY_VM_SPACE	0x60000000
 #elif defined(__mc68000__)
 # define TRY_EMPTY_VM_SPACE	0x40000000
-#elif defined(__ARM_EABI__)
-# define TRY_EMPTY_VM_SPACE     0x60000000
 #elif defined(__mips__) && defined(__LP64__)
 # define TRY_EMPTY_VM_SPACE	0x8000000000
 #elif defined(__mips__)


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