diff --git a/gcc/doc/sourcebuild.texi b/gcc/doc/sourcebuild.texi
--- a/gcc/doc/sourcebuild.texi
+++ b/gcc/doc/sourcebuild.texi
@@ -1679,6 +1679,9 @@ Target might have errors of a few ULP in
 conversion functions and overflow is not always detected correctly by
 those functions.
 
+@item mmap
+Target supports @code{mmap}.
+
 @item newlib
 Target supports Newlib.
 
diff --git a/gcc/testsuite/gcc.c-torture/execute/loop-2f.c b/gcc/testsuite/gcc.c-torture/execute/loop-2f.c
--- a/gcc/testsuite/gcc.c-torture/execute/loop-2f.c
+++ b/gcc/testsuite/gcc.c-torture/execute/loop-2f.c
@@ -1,6 +1,5 @@
 #include <limits.h>
 
-#ifdef __unix__ /* ??? Is that good enough? */
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -18,7 +17,6 @@
 #ifndef MAP_FIXED
 #define MAP_FIXED 0
 #endif
-#endif
 
 #define MAP_START (void *)0x7fff8000
 #define MAP_LEN 0x10000
diff --git a/gcc/testsuite/gcc.c-torture/execute/loop-2f.x b/gcc/testsuite/gcc.c-torture/execute/loop-2f.x
--- a/gcc/testsuite/gcc.c-torture/execute/loop-2f.x
+++ b/gcc/testsuite/gcc.c-torture/execute/loop-2f.x
@@ -1,3 +1,9 @@
+load_lib target-supports.exp
+
+if { ! [check_effective_target_mmap] } {
+        return 1
+}
+
 if [istarget "m68k-*-linux*"] {
     # the executable is at the same position the test tries to remap
     return 1
diff --git a/gcc/testsuite/gcc.c-torture/execute/loop-2g.c b/gcc/testsuite/gcc.c-torture/execute/loop-2g.c
--- a/gcc/testsuite/gcc.c-torture/execute/loop-2g.c
+++ b/gcc/testsuite/gcc.c-torture/execute/loop-2g.c
@@ -1,6 +1,5 @@
 #include <limits.h>
 
-#ifdef __unix__ /* ??? Is that good enough? */
 #include <sys/types.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ -18,7 +17,6 @@
 #ifndef MAP_FIXED
 #define MAP_FIXED 0
 #endif
-#endif
 
 #define MAP_START (void *)0x7fff8000
 #define MAP_LEN 0x10000
diff --git a/gcc/testsuite/gcc.c-torture/execute/loop-2g.x b/gcc/testsuite/gcc.c-torture/execute/loop-2g.x
--- a/gcc/testsuite/gcc.c-torture/execute/loop-2g.x
+++ b/gcc/testsuite/gcc.c-torture/execute/loop-2g.x
@@ -1,3 +1,9 @@
+load_lib target-supports.exp
+
+if { ! [check_effective_target_mmap] } {
+        return 1
+}
+
 if [istarget "m68k-*-linux*"] {
     # the executable is at the same position the test tries to remap
     return 1
diff --git a/gcc/testsuite/gcc.dg/20030711-1.c b/gcc/testsuite/gcc.dg/20030711-1.c
--- a/gcc/testsuite/gcc.dg/20030711-1.c
+++ b/gcc/testsuite/gcc.dg/20030711-1.c
@@ -1,6 +1,6 @@
 /* Test whether strncmp has not been "optimized" into memcmp
    nor any code with memcmp semantics.  */
-/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */
+/* { dg-do run { target mmap } } */
 /* { dg-options "-O2" } */
 #include <stddef.h>
 #include <stdio.h>
@@ -8,6 +8,9 @@
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
+#ifndef MAP_ANON
+#define MAP_ANON 0
+#endif
 #include <stdlib.h>
 
 void __attribute__((noinline)) test (const char *p)
diff --git a/gcc/testsuite/gcc.dg/20050826-1.c b/gcc/testsuite/gcc.dg/20050826-1.c
--- a/gcc/testsuite/gcc.dg/20050826-1.c
+++ b/gcc/testsuite/gcc.dg/20050826-1.c
@@ -1,6 +1,6 @@
 /* Test whether strncmp has not been "optimized" into memcmp
    nor any code with memcmp semantics.  */
-/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */
+/* { dg-do run { target mmap } } */
 /* { dg-options "-O2" } */
 #include <stddef.h>
 #include <stdio.h>
@@ -9,6 +9,9 @@
 #ifndef MAP_ANONYMOUS
 #define MAP_ANONYMOUS MAP_ANON
 #endif
+#ifndef MAP_ANON
+#define MAP_ANON 0
+#endif
 #include <stdlib.h>
 
     struct Flags {
diff --git a/gcc/testsuite/gcc.dg/vect/pr49038.c b/gcc/testsuite/gcc.dg/vect/pr49038.c
--- a/gcc/testsuite/gcc.dg/vect/pr49038.c
+++ b/gcc/testsuite/gcc.dg/vect/pr49038.c
@@ -1,4 +1,4 @@
-/* { dg-do run { target i?86-*-linux* x86_64-*-linux* ia64-*-linux* alpha*-*-linux* powerpc*-*-linux* s390*-*-linux* sparc*-*-linux* *-*-darwin* } } */
+/* { dg-require-effective-target mmap } */
 
 #include <sys/mman.h>
 #include <stdio.h>
diff --git a/gcc/testsuite/gcc.target/i386/pr36533.c b/gcc/testsuite/gcc.target/i386/pr36533.c
--- a/gcc/testsuite/gcc.target/i386/pr36533.c
+++ b/gcc/testsuite/gcc.target/i386/pr36533.c
@@ -1,5 +1,5 @@
 /* PR target/36533 */
-/* { dg-do run { target { { i?86-*-linux* x86_64-*-linux* } && ilp32 } } } */
+/* { dg-do run { target { mmap && ilp32 } } } */
 /* { dg-options "-Os" } */
 #include <string.h>
 #include <sys/mman.h>
diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -697,6 +697,14 @@ proc check_effective_target_fopenmp {} {
     } "-fopenmp"]
 }
 
+# Return 1 if the target supports mmap, 0 otherwise.
+
+proc check_effective_target_mmap {} {
+    return [check_no_compiler_messages mmap assembly {
+	#include <sys/mman.h>
+    }]
+}
+
 # Return 1 if compilation with -pthread is error-free for trivial
 # code, 0 otherwise.
 
