--- gcc-svn-270786.old/libsanitizer/asan/asan_linux.cc 
+++ gcc-svn-270786/libsanitizer/asan/asan_linux.cc
@@ -63,6 +63,10 @@
 #define ucontext_t xucontext_t
 #endif
 
+#ifndef PATH_MAX
+#define PATH_MAX 4096
+#endif
+
 typedef enum {
   ASAN_RT_VERSION_UNDEFINED = 0,
   ASAN_RT_VERSION_DYNAMIC,