diff --git a/libc/arch-arm/include/machine/_types.h b/libc/arch-arm/include/machine/_types.h
index 1521a4c..0a8b610 100644
--- a/libc/arch-arm/include/machine/_types.h
+++ b/libc/arch-arm/include/machine/_types.h
@@ -87,6 +87,8 @@
 /* Standard system types */
 typedef int			__clock_t;
 typedef int			__clockid_t;
+typedef double			__double_t;
+typedef float			__float_t;
 typedef long			__ptrdiff_t;
 typedef	int			__time_t;
 typedef int			__timer_t;
diff --git a/libc/arch-x86/include/machine/_types.h b/libc/arch-x86/include/machine/_types.h
index d217822..3806f78 100644
--- a/libc/arch-x86/include/machine/_types.h
+++ b/libc/arch-x86/include/machine/_types.h
@@ -87,6 +87,8 @@
 /* Standard system types */
 typedef int			__clock_t;
 typedef int			__clockid_t;
+typedef double			__double_t;
+typedef float			__float_t;
 typedef long			__ptrdiff_t;
 typedef	int			__time_t;
 typedef int			__timer_t;
diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index ca81cb6..937abe0 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -177,6 +177,8 @@
 #define	__unused	/* delete */
 #endif
 
+#define __pure2 __attribute__((__const__)) /* Android-added: used by FreeBSD libm */
+
 #if __GNUC_PREREQ__(3, 1)
 #define	__used		__attribute__((__used__))
 #else
@@ -313,6 +315,12 @@
 #define __purefunc
 #endif
 
+#if __GNUC_PREREQ__(3, 1)
+#define __always_inline __attribute__((__always_inline__))
+#else
+#define __always_inline
+#endif
+
 /*
  * Macros for manipulating "link sets".  Link sets are arrays of pointers
  * to objects, which are gathered up by the linker.
@@ -510,4 +518,11 @@
 #define __BIONIC_FORTIFY_UNKNOWN_SIZE ((size_t) -1)
 #endif
 
+/* Android-added: for FreeBSD's libm. */
+#define __weak_reference(sym,alias) \
+    __asm__(".weak " #alias); \
+    __asm__(".equ "  #alias ", " #sym)
+#define __strong_reference(sym,aliassym) \
+    extern __typeof (sym) aliassym __attribute__ ((__alias__ (#sym)))
+
 #endif /* !_SYS_CDEFS_H_ */
diff --git a/libc/tools/check-symbols.py b/libc/tools/check-symbols.py
new file mode 100755
index 0000000..0922548
--- /dev/null
+++ b/libc/tools/check-symbols.py
@@ -0,0 +1,64 @@
+#!/usr/bin/python
+
+import glob
+import os
+import re
+import string
+import subprocess
+import sys
+
+toolchain = os.environ['ANDROID_TOOLCHAIN']
+arch = re.sub(r'.*/linux-x86/([^/]+)/.*', r'\1', toolchain)
+
+sys.stderr.write('Checking symbols for arch "%s"...\n' % arch)
+
+def GetSymbols(library, functions_or_variables):
+  api = '9'
+  if library == 'libm' and arch == 'arm':
+    api = '3'
+  path = '%s/development/ndk/platforms/android-%s/arch-%s/symbols/%s.so.%s.txt' % (os.environ['ANDROID_BUILD_TOP'], api, arch, library, functions_or_variables)
+  symbols = set()
+  for line in open(path, 'r'):
+    symbols.add(line.rstrip())
+  #sys.stdout.write('%d %s in %s for %s\n' % (len(symbols), functions_or_variables, library, arch))
+  return symbols
+
+def CheckSymbols(library, functions_or_variables):
+  expected_symbols = GetSymbols(library, functions_or_variables)
+
+  so_file = '%s/system/lib/%s.so' % (os.environ['ANDROID_PRODUCT_OUT'], library)
+
+  # Example readelf output:
+  #   264: 0001623c     4 FUNC    GLOBAL DEFAULT    8 cabsf
+  #   266: 00016244     4 FUNC    GLOBAL DEFAULT    8 dremf
+  #   267: 00019018     4 OBJECT  GLOBAL DEFAULT   11 __fe_dfl_env
+  #   268: 00000000     0 FUNC    GLOBAL DEFAULT  UND __aeabi_dcmplt
+
+
+  r = re.compile(r' +\d+: [0-9a-f]+ +\d+ (FUNC|OBJECT) +\S+ +\S+ +\d+ (\S+)')
+
+  actual_symbols = set()
+  for line in subprocess.check_output(['readelf', '--dyn-syms', so_file]).split('\n'):
+    m = r.match(line)
+    if m:
+      if m.group(1) == 'FUNC' and functions_or_variables == 'functions':
+        actual_symbols.add(m.group(2))
+      elif m.group(1) == 'OBJECT' and functions_or_variables == 'variables':
+        actual_symbols.add(m.group(2))
+    #else:
+      #print 'ignoring: ' % line
+
+  missing = expected_symbols - actual_symbols
+  if len(missing) > 0:
+    sys.stderr.write('%d missing %s in %s for %s:\n' % (len(missing), functions_or_variables, library, arch))
+    for miss in sorted(missing):
+      sys.stderr.write('  %s\n' % miss)
+
+  return len(missing) == 0
+
+CheckSymbols("libc", "functions")
+CheckSymbols("libc", "variables")
+CheckSymbols("libm", "functions")
+CheckSymbols("libm", "variables")
+
+sys.exit(0)