commit 080803512c8f6f87c2f1f711170d54033144d628
Author: Dmitry Moskalchuk <dm@crystax.net>
Date:   Wed Jul 29 11:28:29 2015 +0300

    [android] Apply Android-related modifications
    
    Signed-off-by: Dmitry Moskalchuk <dm@crystax.net>

[Edited: keep libstdc++, drop libcrystax-related modifications]
---
 gcc/config.gcc                             |   17 +++++++-
 gcc/config/aarch64/aarch64-linux-android.h |   59 +++++++++++++++++++++++++++++
 gcc/config/aarch64/aarch64-linux.h         |    9 +++-
 gcc/config/arm/arm.h                       |    3 -
 gcc/config/arm/arm.md                      |    2 
 gcc/config/arm/arm.opt                     |    4 +
 gcc/config/arm/elf.h                       |    9 ++--
 gcc/config/arm/linux-eabi.h                |    7 ++-
 gcc/config/i386/gnu-user.h                 |    7 ++-
 gcc/config/i386/gnu-user64.h               |    5 ++
 gcc/config/i386/linux-common.h             |    8 +++
 gcc/config/linux-android.h                 |   13 +++---
 gcc/config/mips/android.h                  |   49 ++++++++++++++++++++++++
 gcc/config/mips/gnu-user.h                 |    6 +-
 gcc/config/mips/linux-common.h             |    2 
 gcc/config/mips/t-linux-android            |    3 +
 gcc/config/mips/t-linux-android64          |    4 +
 libgcc/gthr-posix.h                        |   13 ++++++
 libstdc++-v3/configure                     |   12 +++++
 libstdc++-v3/include/bits/locale_facets.h  |   18 +++++++-
 libstdc++-v3/libsupc++/guard.cc            |    5 ++
 21 files changed, 235 insertions(+), 20 deletions(-)

--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -963,13 +963,17 @@
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-freebsd"
 	;;
 aarch64*-*-linux*)
-	tm_file="${tm_file} dbxelf.h elfos.h gnu-user.h linux.h glibc-stdint.h"
+	tm_file="${tm_file} dbxelf.h elfos.h gnu-user.h linux.h linux-android.h glibc-stdint.h"
 	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-linux.h"
+	extra_options="${extra_options} linux-android.opt"
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-linux"
 	case $target in
 	aarch64_be-*)
 		tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"
 		;;
+	aarch64*-*-linux-android*)
+		tm_file="${tm_file} aarch64/aarch64-linux-android.h"
+		;;
 	esac
 	aarch64_multilibs="${with_multilib_list}"
 	if test "$aarch64_multilibs" = "default"; then
@@ -2094,6 +2098,17 @@
 	tm_file="dbxelf.h elfos.h gnu-user.h linux.h linux-android.h glibc-stdint.h ${tm_file} mips/gnu-user.h mips/linux.h mips/linux-common.h"
 	extra_options="${extra_options} linux-android.opt"
 	case ${target} in
+		mips64*android*)
+			default_mips_arch=mips64r6
+			default_mips_abi=64
+			tm_file="${tm_file} mips/android.h"
+			tmake_file="${tmake_file} mips/t-linux-android64"
+			;;
+		mips*android*)
+			default_mips_arch=mips32
+			tm_file="${tm_file} mips/android.h"
+			tmake_file="$tmake_file mips/t-linux-android"
+			;;
 		mipsisa32r6*)
 			default_mips_arch=mips32r6
 			;;
--- /dev/null
+++ b/gcc/config/aarch64/aarch64-linux-android.h
@@ -0,0 +1,59 @@
+/* Machine description for AArch64 architecture.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef GCC_AARCH64_LINUX_ANDROID_H
+#define GCC_AARCH64_LINUX_ANDROID_H
+
+
+#undef TARGET_OS_CPP_BUILTINS
+#define TARGET_OS_CPP_BUILTINS()		\
+  do						\
+    {						\
+	GNU_USER_TARGET_OS_CPP_BUILTINS();	\
+	ANDROID_TARGET_OS_CPP_BUILTINS();	\
+    }						\
+  while (0)
+
+#undef  LINK_SPEC
+#define LINK_SPEC							\
+  LINUX_OR_ANDROID_LD (LINUX_TARGET_LINK_SPEC,				\
+		       LINUX_TARGET_LINK_SPEC " " ANDROID_LINK_SPEC)
+
+#undef  CC1_SPEC
+#define CC1_SPEC							\
+  LINUX_OR_ANDROID_CC (GNU_USER_TARGET_CC1_SPEC,			\
+		       GNU_USER_TARGET_CC1_SPEC " " ANDROID_CC1_SPEC("-fpic"))
+
+#define CC1PLUS_SPEC \
+  LINUX_OR_ANDROID_CC ("", ANDROID_CC1PLUS_SPEC)
+
+#undef  LIB_SPEC
+#define LIB_SPEC							\
+  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_LIB_SPEC,			\
+		    GNU_USER_TARGET_NO_PTHREADS_LIB_SPEC " " ANDROID_LIB_SPEC)
+
+#undef	STARTFILE_SPEC
+#define STARTFILE_SPEC \
+  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_STARTFILE_SPEC, ANDROID_STARTFILE_SPEC)
+
+#undef	ENDFILE_SPEC
+#define ENDFILE_SPEC \
+  LINUX_OR_ANDROID_LD (GNU_USER_TARGET_ENDFILE_SPEC, ANDROID_ENDFILE_SPEC)
+
+#endif  /* GCC_AARCH64_LINUX_ANDROID_H */
--- a/gcc/config/aarch64/aarch64-linux.h
+++ b/gcc/config/aarch64/aarch64-linux.h
@@ -21,7 +21,14 @@
 #ifndef GCC_AARCH64_LINUX_H
 #define GCC_AARCH64_LINUX_H
 
-#define GLIBC_DYNAMIC_LINKER "/lib/ld-linux-aarch64%{mbig-endian:_be}%{mabi=ilp32:_ilp32}.so.1"
+#ifndef RUNTIME_ROOT_PREFIX
+#define RUNTIME_ROOT_PREFIX ""
+#endif
+#define GLIBC_DYNAMIC_LINKER RUNTIME_ROOT_PREFIX "/lib/ld-linux-aarch64%{mbig-endian:_be}%{mabi=ilp32:_ilp32}.so.1"
+#ifdef BIONIC_DYNAMIC_LINKER
+#undef BIONIC_DYNAMIC_LINKER
+#endif
+#define BIONIC_DYNAMIC_LINKER RUNTIME_ROOT_PREFIX "/system/bin/linker64"
 
 #undef MUSL_DYNAMIC_LINKER
 #define MUSL_DYNAMIC_LINKER "/lib/ld-musl-aarch64%{mbig-endian:_be}%{mabi=ilp32:_ilp32}.so.1"
--- a/gcc/config/arm/arm.h
+++ b/gcc/config/arm/arm.h
@@ -1885,10 +1885,11 @@
 
 #define CASE_VECTOR_PC_RELATIVE (TARGET_THUMB2				\
 				 || (TARGET_THUMB1			\
+				     && !inline_thumb1_jump_table	\
 				     && (optimize_size || flag_pic)))
 
 #define CASE_VECTOR_SHORTEN_MODE(min, max, body)			\
-  (TARGET_THUMB1							\
+  (TARGET_THUMB1 && !inline_thumb1_jump_table				\
    ? (min >= 0 && max < 512						\
       ? (ADDR_DIFF_VEC_FLAGS (body).offset_unsigned = 1, QImode)	\
       : min >= -256 && max < 256					\
--- a/gcc/config/arm/arm.md
+++ b/gcc/config/arm/arm.md
@@ -8738,7 +8738,7 @@
    (match_operand:SI 2 "const_int_operand" "")	; total range
    (match_operand:SI 3 "" "")			; table label
    (match_operand:SI 4 "" "")]			; Out of range label
-  "(TARGET_32BIT || optimize_size || flag_pic) && !target_pure_code"
+  "(TARGET_32BIT || ((optimize_size || flag_pic) && !inline_thumb1_jump_table)) && !target_pure_code"
   "
   {
     enum insn_code code;
--- a/gcc/config/arm/arm.opt
+++ b/gcc/config/arm/arm.opt
@@ -193,6 +193,10 @@
 Target Report Mask(INTERWORK)
 Support calls between Thumb and ARM instruction sets.
 
+minline-thumb1-jumptable
+Target Report Var(inline_thumb1_jump_table)
+Inline Thumb1 Jump table code
+
 mtls-dialect=
 Target RejectNegative Joined Enum(tls_type) Var(target_tls_dialect) Init(TLS_GNU)
 Specify thread local storage scheme.
--- a/gcc/config/arm/elf.h
+++ b/gcc/config/arm/elf.h
@@ -56,8 +56,7 @@
 #undef SUBSUBTARGET_EXTRA_SPECS
 #define SUBSUBTARGET_EXTRA_SPECS
 
-#ifndef ASM_SPEC
-#define ASM_SPEC "\
+#define DEFAULT_ASM_SPEC "\
 %{mbig-endian:-EB} \
 %{mlittle-endian:-EL} \
 %(asm_cpu_spec) \
@@ -66,6 +65,9 @@
 %{mthumb-interwork:-mthumb-interwork} \
 %{mfloat-abi=*} %{mfpu=*} \
 %(subtarget_extra_asm_spec)"
+
+#ifndef ASM_SPEC
+#define ASM_SPEC DEFAULT_ASM_SPEC
 #endif
 
 /* The ARM uses @ are a comment character so we need to redefine
@@ -95,7 +97,8 @@
    the code more efficient, but for Thumb-1 it's better to put them out of
    band unless we are generating compressed tables.  */
 #define JUMP_TABLES_IN_TEXT_SECTION					\
-   ((TARGET_32BIT || (TARGET_THUMB && (optimize_size || flag_pic))) \
+   ((TARGET_32BIT || (TARGET_THUMB && !inline_thumb1_jump_table \
+                    && (optimize_size || flag_pic))) \
     && !target_pure_code)
 
 #ifndef LINK_SPEC
--- a/gcc/config/arm/linux-eabi.h
+++ b/gcc/config/arm/linux-eabi.h
@@ -102,11 +102,16 @@
 #define CC1_SPEC							\
   LINUX_OR_ANDROID_CC (GNU_USER_TARGET_CC1_SPEC " " ASAN_CC1_SPEC,	\
 		       GNU_USER_TARGET_CC1_SPEC " " ASAN_CC1_SPEC " "	\
-		       ANDROID_CC1_SPEC)
+		       ANDROID_CC1_SPEC("-fpic"))
 
 #define CC1PLUS_SPEC \
   LINUX_OR_ANDROID_CC ("", ANDROID_CC1PLUS_SPEC)
 
+#undef ASM_SPEC
+#define ASM_SPEC \
+  LINUX_OR_ANDROID_CC (DEFAULT_ASM_SPEC, \
+                       DEFAULT_ASM_SPEC  " " ANDROID_ASM_SPEC)
+
 #undef  LIB_SPEC
 #define LIB_SPEC							\
   LINUX_OR_ANDROID_LD (GNU_USER_TARGET_LIB_SPEC,			\
--- a/gcc/config/i386/gnu-user.h
+++ b/gcc/config/i386/gnu-user.h
@@ -65,9 +65,14 @@
    When the -shared link option is used a final link is not being
    done.  */
 
+#undef ANDROID_TARGET_CC1_SPEC
+#define ANDROID_TARGET_CC1_SPEC \
+  " -mssse3 -fno-short-enums " \
+
 #undef  ASM_SPEC
 #define ASM_SPEC \
-  "--32 %{msse2avx:%{!mavx:-msse2avx}}"
+  "--32 %{msse2avx:%{!mavx:-msse2avx}} " \
+  LINUX_OR_ANDROID_CC ("", ANDROID_ASM_SPEC)
 
 #undef  SUBTARGET_EXTRA_SPECS
 #define SUBTARGET_EXTRA_SPECS \
--- a/gcc/config/i386/gnu-user64.h
+++ b/gcc/config/i386/gnu-user64.h
@@ -46,6 +46,11 @@
 #define SPEC_X32 "mx32"
 #endif
 
+#undef ANDROID_TARGET_CC1_SPEC
+#define ANDROID_TARGET_CC1_SPEC \
+  "%{m32:-mssse3 -fno-short-enums}" \
+  "%{!m32:-msse4.2 -mpopcnt}"
+
 #undef ASM_SPEC
 #define ASM_SPEC "%{" SPEC_32 ":--32} \
  %{" SPEC_64 ":--64} \
--- a/gcc/config/i386/linux-common.h
+++ b/gcc/config/i386/linux-common.h
@@ -30,7 +30,13 @@
 #undef CC1_SPEC
 #define CC1_SPEC \
   LINUX_OR_ANDROID_CC (GNU_USER_TARGET_CC1_SPEC, \
-		       GNU_USER_TARGET_CC1_SPEC " " ANDROID_CC1_SPEC)
+                       GNU_USER_TARGET_CC1_SPEC \
+                       ANDROID_TARGET_CC1_SPEC \
+                       " " \
+                       ANDROID_CC1_SPEC("-fPIC"))
+
+#define CC1PLUS_SPEC \
+  LINUX_OR_ANDROID_CC ("", ANDROID_CC1PLUS_SPEC)
 
 #undef	LINK_SPEC
 #define LINK_SPEC \
--- a/gcc/config/linux-android.h
+++ b/gcc/config/linux-android.h
@@ -38,15 +38,18 @@
   "%{" NOANDROID "|tno-android-ld:" LINUX_SPEC ";:" ANDROID_SPEC "}"
 
 #define ANDROID_LINK_SPEC \
-  "%{shared: -Bsymbolic}"
+  "%{shared: -Bsymbolic} -z noexecstack -z relro -z now"
 
-#define ANDROID_CC1_SPEC						\
+#define ANDROID_CC1_SPEC(ANDROID_PIC_DEFAULT)				\
   "%{!mglibc:%{!muclibc:%{!mbionic: -mbionic}}} "			\
-  "%{!fno-pic:%{!fno-PIC:%{!fpic:%{!fPIC: -fPIC}}}}"
+  "%{!fno-pic:%{!fno-PIC:%{!fpic:%{!fPIC: " ANDROID_PIC_DEFAULT "}}}}"
 
 #define ANDROID_CC1PLUS_SPEC						\
-  "%{!fexceptions:%{!fno-exceptions: -fno-exceptions}} "		\
-  "%{!frtti:%{!fno-rtti: -fno-rtti}}"
+  "%{!fexceptions:%{!fno-exceptions: -fexceptions}} "		\
+  "%{!frtti:%{!fno-rtti: -frtti}}"
+
+#define ANDROID_ASM_SPEC \
+  "--noexecstack"
 
 #define ANDROID_LIB_SPEC \
   "%{!static: -ldl}"
--- /dev/null
+++ b/gcc/config/mips/android.h
@@ -0,0 +1,49 @@
+/* Target macros for mips*-*android* targets.
+   Copyright (C) 2014 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 3, or (at your option)
+any later version.
+
+GCC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.  */
+
+#undef DRIVER_SELF_SPECS
+#define DRIVER_SELF_SPECS						\
+  /* Make sure a -mips option is present.  This helps us to pick	\
+     the right multilib, and also makes the later specs easier		\
+     to write.  */							\
+  MIPS_ISA_LEVEL_SPEC,							\
+									\
+  /* Infer the default float setting from -march.  */			\
+  MIPS_ARCH_FLOAT_SPEC,							\
+									\
+  /* Infer the -msynci setting from -march if not explicitly set.  */	\
+  MIPS_ISA_SYNCI_SPEC,							\
+									\
+  /* If no ABI option is specified, infer one from the ISA level	\
+     or -mgp setting.  */						\
+  "%{!mabi=*: %{" MIPS_32BIT_OPTION_SPEC ": -mabi=32;: -mabi=64}}",	\
+									\
+  /* If no FP ABI option is specified, infer one from the		\
+     ABI/ISA level unless there is a conflicting option.  */		\
+  "%{!msoft-float: %{!msingle-float: %{!mfp*: %{!mmsa: %{mabi=32: %{"	\
+  MIPS_FPXX_OPTION_SPEC ": -mfpxx}}}}}}",				\
+									\
+  /* If no odd-spreg option is specified, infer one from the ISA.  */	\
+  "%{!modd-spreg: %{mabi=32: %{mips32r6: -mno-odd-spreg}}}",		\
+									\
+  /* Base SPECs.  */							\
+  BASE_DRIVER_SELF_SPECS,						\
+									\
+  /* Use the standard linux specs for everything else.  */		\
+  LINUX_DRIVER_SELF_SPECS
--- a/gcc/config/mips/gnu-user.h
+++ b/gcc/config/mips/gnu-user.h
@@ -36,6 +36,7 @@
     /* The GNU C++ standard library requires this.  */		\
     if (c_dialect_cxx ())					\
       builtin_define ("_GNU_SOURCE");				\
+    ANDROID_TARGET_OS_CPP_BUILTINS();				\
   } while (0)
 
 #undef SUBTARGET_CPP_SPEC
@@ -71,7 +72,8 @@
 
 #undef SUBTARGET_ASM_SPEC
 #define SUBTARGET_ASM_SPEC \
-  "%{!mno-abicalls:%{mplt:-call_nonpic;:-KPIC}}"
+  "%{!mno-abicalls:%{mplt:-call_nonpic;:-KPIC}} " \
+  LINUX_OR_ANDROID_CC ("", ANDROID_ASM_SPEC)
 
 /* The MIPS assembler has different syntax for .set. We set it to
    .dummy to trap any errors.  */
@@ -120,7 +122,7 @@
 #endif
 
 #define LINUX_DRIVER_SELF_SPECS \
-  NO_SHARED_SPECS							\
+  LINUX_OR_ANDROID_CC(NO_SHARED_SPECS, "")                              \
   MARCH_MTUNE_NATIVE_SPECS,						\
   /* -mplt has no effect without -mno-shared.  Simplify later		\
      specs handling by removing a redundant option.  */			\
--- a/gcc/config/mips/linux-common.h
+++ b/gcc/config/mips/linux-common.h
@@ -35,7 +35,7 @@
 #undef  SUBTARGET_CC1_SPEC
 #define SUBTARGET_CC1_SPEC						\
   LINUX_OR_ANDROID_CC (GNU_USER_TARGET_CC1_SPEC,			\
-		       GNU_USER_TARGET_CC1_SPEC " " ANDROID_CC1_SPEC)
+		       GNU_USER_TARGET_CC1_SPEC " " ANDROID_CC1_SPEC("-fpic"))
 
 #undef  CC1PLUS_SPEC
 #define CC1PLUS_SPEC							\
--- /dev/null
+++ b/gcc/config/mips/t-linux-android
@@ -0,0 +1,3 @@
+MULTILIB_OPTIONS = mips32r2/mips32r6
+MULTILIB_DIRNAMES = mips-r2 mips-r6
+MULTILIB_OSDIRNAMES = ../libr2 ../libr6
--- /dev/null
+++ b/gcc/config/mips/t-linux-android64
@@ -0,0 +1,4 @@
+MULTILIB_OPTIONS = mabi=32 mips32/mips32r2/mips32r6/mips64r2/mips64r6
+MULTILIB_DIRNAMES = 32 mips-r1 mips-r2 mips-r6 mips64-r2 mips64-r6
+MULTILIB_OSDIRNAMES = ../lib ../lib ../libr2 ../libr6 ../lib64r2 ../lib64
+MULTILIB_REQUIRED = mabi=32/mips32 mabi=32/mips32r2 mabi=32/mips32r6 mips64r2 mips64r6
--- a/libgcc/gthr-posix.h
+++ b/libgcc/gthr-posix.h
@@ -32,6 +32,19 @@
 #define __GTHREADS 1
 #define __GTHREADS_CXX0X 1
 
+/* The following should normally be in a different header file,
+ * but I couldn't find the right location. The point of the macro
+ * definition below is to prevent libsupc++ and libstdc++ to reference
+ * weak symbols in their static C++ constructors. Such code crashes
+ * when a shared object linked statically to these libraries is
+ * loaded on Android 2.1 (Eclair) and older platform releases, due
+ * to a dynamic linker bug.
+ */
+#ifdef __ANDROID__
+#undef GTHREAD_USE_WEAK
+#define GTHREAD_USE_WEAK 0
+#endif
+
 #include <pthread.h>
 
 #if ((defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)) \
--- a/libstdc++-v3/configure
+++ b/libstdc++-v3/configure
@@ -78577,6 +78577,12 @@
 /* end confdefs.h.  */
 #include <sys/syscall.h>
 	   int lk;
+#if !defined(SYS_gettid)
+#define SYS_gettid __NR_gettid
+#endif
+#if !defined(SYS_futex)
+#define SYS_futex __NR_futex
+#endif
 int
 main ()
 {
@@ -78635,6 +78641,12 @@
 /* end confdefs.h.  */
 #include <sys/syscall.h>
 	   int lk;
+#if !defined(SYS_gettid)
+#define SYS_gettid __NR_gettid
+#endif
+#if !defined(SYS_futex)
+#define SYS_futex __NR_futex
+#endif
 int
 main ()
 {
--- a/libstdc++-v3/include/bits/locale_facets.h
+++ b/libstdc++-v3/include/bits/locale_facets.h
@@ -47,6 +47,20 @@
 #include <ext/numeric_traits.h>
 #include <bits/streambuf_iterator.h>
 
+#if !__clang__ && __GNUC__ == 4 && __GNUC_MINOR__ == 9 && __i386__
+// CrystaX: for some reason, x86 gcc-4.9 makes ctype<char>::do_widen() and
+// ctype<char>::_M_widen_init() methods working wrong if optimization enabled.
+// For ctype<char>::do_widen(), values of passed arguments (__lo, __hi and __to)
+// are completely messed up and don't correspond to passed values. In case if
+// we disable optimization for those methods, things become correct so we apply
+// this workaround here for a time.
+// TODO: figure out what exactly wrong here - is it bug in GCC optimization
+// algorithm or smth else?
+#define __CRYSTAX_X86_DONT_OPTIMIZE __attribute__((optimize(0)))
+#else
+#define __CRYSTAX_X86_DONT_OPTIMIZE
+#endif
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
@@ -1102,7 +1116,7 @@
        *  @return  @a __hi.
       */
       virtual const char*
-      do_widen(const char* __lo, const char* __hi, char_type* __to) const
+      do_widen(const char* __lo, const char* __hi, char_type* __to) const __CRYSTAX_X86_DONT_OPTIMIZE
       {
 	__builtin_memcpy(__to, __lo, __hi - __lo);
 	return __hi;
@@ -1163,7 +1177,7 @@
 
     private:
       void _M_narrow_init() const;
-      void _M_widen_init() const;
+      void _M_widen_init() const __CRYSTAX_X86_DONT_OPTIMIZE;
     };
 
 #ifdef _GLIBCXX_USE_WCHAR_T
--- a/libstdc++-v3/libsupc++/guard.cc
+++ b/libstdc++-v3/libsupc++/guard.cc
@@ -34,7 +34,12 @@
 #if defined(__GTHREADS) && defined(__GTHREAD_HAS_COND) \
   && (ATOMIC_INT_LOCK_FREE > 1) && defined(_GLIBCXX_HAVE_LINUX_FUTEX)
 # include <climits>
+#if defined(__ANDROID__)
+# include <sys/syscall.h>
+# define SYS_futex __NR_futex
+#else
 # include <syscall.h>
+#endif
 # include <unistd.h>
 # define _GLIBCXX_USE_FUTEX
 # define _GLIBCXX_FUTEX_WAIT 0
