diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 5bae99d..16a17c4 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -2492,6 +2492,13 @@ struct GTY(()) machine_function {
 #undef TARG_COND_NOT_TAKEN_BRANCH_COST
 #define TARG_COND_NOT_TAKEN_BRANCH_COST ix86_cost->cond_not_taken_branch_cost
 
+/* Use x87 FPU fsincos if it is available.  */
+#undef TARGET_HAS_SINCOS
+#define TARGET_HAS_SINCOS				\
+  (TARGET_USE_FANCY_MATH_387				\
+   && flag_unsafe_math_optimizations	 		\
+   && (!TARGET_SSE_MATH || TARGET_MIX_SSE_I387))
+
 /*
 Local variables:
 version-control: t
diff --git a/gcc/config/i386/linux.h b/gcc/config/i386/linux.h
index 2a31880..42db416 100644
--- a/gcc/config/i386/linux.h
+++ b/gcc/config/i386/linux.h
@@ -35,6 +35,16 @@ along with GCC; see the file COPYING3.  If not see
 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
 
+/* Whether we have sincos that follows the GNU extension.  There is no
+   sincos in Bionic C library.  We can only use x87 FPU fsincos if it
+   is available.  */
+#undef TARGET_HAS_SINCOS
+#define TARGET_HAS_SINCOS				\
+  (OPTION_GLIBC						\
+   || (TARGET_USE_FANCY_MATH_387			\
+       && flag_unsafe_math_optimizations		\
+       && (!TARGET_SSE_MATH || TARGET_MIX_SSE_I387)))
+
 #undef ASM_COMMENT_START
 #define ASM_COMMENT_START "#"
 
diff --git a/gcc/config/i386/linux64.h b/gcc/config/i386/linux64.h
index 867de59..7bc12b7 100644
--- a/gcc/config/i386/linux64.h
+++ b/gcc/config/i386/linux64.h
@@ -50,6 +50,16 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #undef TARGET_TLS_DIRECT_SEG_REFS_DEFAULT
 #define TARGET_TLS_DIRECT_SEG_REFS_DEFAULT MASK_TLS_DIRECT_SEG_REFS
 
+/* Whether we have sincos that follows the GNU extension.  There is no
+   sincos in Bionic C library.  We can only use x87 FPU fsincos if it
+   is available.  */
+#undef TARGET_HAS_SINCOS
+#define TARGET_HAS_SINCOS				\
+  (OPTION_GLIBC						\
+   || (TARGET_USE_FANCY_MATH_387			\
+       && flag_unsafe_math_optimizations		\
+       && (!TARGET_SSE_MATH || TARGET_MIX_SSE_I387)))
+
 /* Provide a LINK_SPEC.  Here we provide support for the special GCC
    options -static and -shared, which allow us to link things in one
    of these three modes by applying the appropriate combinations of
diff --git a/gcc/config/linux.h b/gcc/config/linux.h
index e283a9a..576a2ac 100644
--- a/gcc/config/linux.h
+++ b/gcc/config/linux.h
@@ -159,7 +159,9 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
    is present in the runtime library.  */
 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
 
+#ifndef TARGET_HAS_SINCOS
 /* Whether we have sincos that follows the GNU extension.  */
 #define TARGET_HAS_SINCOS (OPTION_GLIBC || OPTION_BIONIC)
+#endif
 
 #define TARGET_POSIX_IO