Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_internal_defs.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_internal_defs.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_internal_defs.h
@@ -172,6 +172,7 @@
 
 #if SANITIZER_FREEBSD || SANITIZER_NETBSD || \
     SANITIZER_OPENBSD || SANITIZER_MAC || \
+    (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
     (SANITIZER_LINUX && defined(__x86_64__))
 typedef u64 OFF_T;
 #else
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_solaris.h
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_solaris.h
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_limits_solaris.h
@@ -210,8 +210,7 @@
   int cmsg_type;
 };
 
-#if SANITIZER_SOLARIS32 && 0
-// FIXME: need to deal with large file and non-large file cases
+#if SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)
 struct __sanitizer_dirent {
   unsigned long long d_ino;
   long long d_off;
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_procmaps_solaris.cc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_procmaps_solaris.cc
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_procmaps_solaris.cc
@@ -13,6 +13,8 @@
 #include "sanitizer_common.h"
 #include "sanitizer_procmaps.h"
 
+// Before Solaris 11.4, <procfs.h> doesn't work in a largefile environment.
+#undef _FILE_OFFSET_BITS
 #include <procfs.h>
 #include <limits.h>
 
Index: compiler-rt/trunk/lib/sanitizer_common/sanitizer_solaris.cc
===================================================================
--- compiler-rt/trunk/lib/sanitizer_common/sanitizer_solaris.cc
+++ compiler-rt/trunk/lib/sanitizer_common/sanitizer_solaris.cc
@@ -48,10 +48,21 @@
   DECLARE__REAL(ret_type, func, __VA_ARGS__); \
   ret_type internal_ ## func(__VA_ARGS__)
 
+#if !defined(_LP64) && _FILE_OFFSET_BITS == 64
+#define _REAL64(func) _ ## func ## 64
+#else
+#define _REAL64(func) _REAL(func)
+#endif
+#define DECLARE__REAL64(ret_type, func, ...) \
+  extern "C" ret_type _REAL64(func)(__VA_ARGS__)
+#define DECLARE__REAL_AND_INTERNAL64(ret_type, func, ...) \
+  DECLARE__REAL64(ret_type, func, __VA_ARGS__); \
+  ret_type internal_ ## func(__VA_ARGS__)
+
 // ---------------------- sanitizer_libc.h
-DECLARE__REAL_AND_INTERNAL(uptr, mmap, void *addr, uptr /*size_t*/ length,
-                           int prot, int flags, int fd, OFF_T offset) {
-  return (uptr)_REAL(mmap)(addr, length, prot, flags, fd, offset);
+DECLARE__REAL_AND_INTERNAL64(uptr, mmap, void *addr, uptr /*size_t*/ length,
+                             int prot, int flags, int fd, OFF_T offset) {
+  return (uptr)_REAL64(mmap)(addr, length, prot, flags, fd, offset);
 }
 
 DECLARE__REAL_AND_INTERNAL(uptr, munmap, void *addr, uptr length) {
@@ -66,14 +77,14 @@
   return _REAL(close)(fd);
 }
 
-extern "C" int _REAL(open)(const char *, int, ...);
+extern "C" int _REAL64(open)(const char *, int, ...);
 
 uptr internal_open(const char *filename, int flags) {
-  return _REAL(open)(filename, flags);
+  return _REAL64(open)(filename, flags);
 }
 
 uptr internal_open(const char *filename, int flags, u32 mode) {
-  return _REAL(open)(filename, flags, mode);
+  return _REAL64(open)(filename, flags, mode);
 }
 
 uptr OpenFile(const char *filename, bool write) {
@@ -94,16 +105,16 @@
   return ftruncate(fd, size);
 }
 
-DECLARE__REAL_AND_INTERNAL(uptr, stat, const char *path, void *buf) {
-  return _REAL(stat)(path, (struct stat *)buf);
+DECLARE__REAL_AND_INTERNAL64(uptr, stat, const char *path, void *buf) {
+  return _REAL64(stat)(path, (struct stat *)buf);
 }
 
-DECLARE__REAL_AND_INTERNAL(uptr, lstat, const char *path, void *buf) {
-  return _REAL(lstat)(path, (struct stat *)buf);
+DECLARE__REAL_AND_INTERNAL64(uptr, lstat, const char *path, void *buf) {
+  return _REAL64(lstat)(path, (struct stat *)buf);
 }
 
-DECLARE__REAL_AND_INTERNAL(uptr, fstat, fd_t fd, void *buf) {
-  return _REAL(fstat)(fd, (struct stat *)buf);
+DECLARE__REAL_AND_INTERNAL64(uptr, fstat, fd_t fd, void *buf) {
+  return _REAL64(fstat)(fd, (struct stat *)buf);
 }
 
 uptr internal_filesize(fd_t fd) {
@@ -153,13 +164,13 @@
 }
 
 // FIXME: This might be wrong: _getdents doesn't take a struct linux_dirent *.
-DECLARE__REAL_AND_INTERNAL(uptr, getdents, fd_t fd, struct linux_dirent *dirp,
-                           unsigned int count) {
-  return _REAL(getdents)(fd, dirp, count);
+DECLARE__REAL_AND_INTERNAL64(uptr, getdents, fd_t fd, struct linux_dirent *dirp,
+                             unsigned int count) {
+  return _REAL64(getdents)(fd, dirp, count);
 }
 
-DECLARE__REAL_AND_INTERNAL(uptr, lseek, fd_t fd, OFF_T offset, int whence) {
-  return _REAL(lseek)(fd, offset, whence);
+DECLARE__REAL_AND_INTERNAL64(uptr, lseek, fd_t fd, OFF_T offset, int whence) {
+  return _REAL64(lseek)(fd, offset, whence);
 }
 
 // FIXME: This might be wrong: _sigfillset doesn't take a