uClibc: implement copysignl in libc on powerpc to avoid undefined references in libstdc++

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18178 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/toolchain/uClibc/patches-0.9.30.1/450-powerpc_copysignl.patch b/toolchain/uClibc/patches-0.9.30.1/450-powerpc_copysignl.patch
new file mode 100644 (file)
index 0000000..2bdf1f3
--- /dev/null
+++ b/toolchain/uClibc/patches-0.9.30.1/450-powerpc_copysignl.patch
@@ -0,0 +1,103 @@
+--- a/libc/sysdeps/linux/powerpc/Makefile.arch
++++ b/libc/sysdeps/linux/powerpc/Makefile.arch
+@@ -5,7 +5,7 @@
+ # Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ #
+ 
+-CSRC := __syscall_error.c pread_write.c ioctl.c
++CSRC := __syscall_error.c pread_write.c ioctl.c copysignl.c
+ 
+ SSRC := \
+       __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S brk.S \
+--- /dev/null
++++ b/libc/sysdeps/linux/powerpc/copysignl.c
+@@ -0,0 +1,89 @@
++/* s_copysignl.c -- long double version of s_copysign.c.
++ * Conversion to long double by Ulrich Drepper,
++ * Cygnus Support, drepper@cygnus.com.
++ */
++
++/*
++ * ====================================================
++ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
++ *
++ * Developed at SunPro, a Sun Microsystems, Inc. business.
++ * Permission to use, copy, modify, and distribute this
++ * software is freely granted, provided that this notice
++ * is preserved.
++ * ====================================================
++ */
++
++/*
++ * copysignl(long double x, long double y)
++ * copysignl(x,y) returns a value with the magnitude of x and
++ * with the sign bit of y.
++ */
++
++#include <endian.h>
++#include <stdint.h>
++
++#if __FLOAT_WORD_ORDER == BIG_ENDIAN
++
++typedef union
++{
++  long double value;
++  struct
++  {
++    int sign_exponent:16;
++    unsigned int empty:16;
++    uint32_t msw;
++    uint32_t lsw;
++  } parts;
++} ieee_long_double_shape_type;
++
++#endif
++
++#if __FLOAT_WORD_ORDER == LITTLE_ENDIAN
++
++typedef union
++{
++  long double value;
++  struct
++  {
++    uint32_t lsw;
++    uint32_t msw;
++    int sign_exponent:16;
++    unsigned int empty:16;
++  } parts;
++} ieee_long_double_shape_type;
++
++#endif
++
++/* Get int from the exponent of a long double.  */
++
++#define GET_LDOUBLE_EXP(exp,d)                                        \
++do {                                                          \
++  ieee_long_double_shape_type ge_u;                           \
++  ge_u.value = (d);                                           \
++  (exp) = ge_u.parts.sign_exponent;                           \
++} while (0)
++
++/* Set exponent of a long double from an int.  */
++
++#define SET_LDOUBLE_EXP(d,exp)                                        \
++do {                                                          \
++  ieee_long_double_shape_type se_u;                           \
++  se_u.value = (d);                                           \
++  se_u.parts.sign_exponent = (exp);                           \
++  (d) = se_u.value;                                           \
++} while (0)
++
++long double copysignl(long double x, long double y);
++libc_hidden_proto(copysignl);
++
++long double copysignl(long double x, long double y)
++{
++      uint32_t es1,es2;
++      GET_LDOUBLE_EXP(es1,x);
++      GET_LDOUBLE_EXP(es2,y);
++      SET_LDOUBLE_EXP(x,(es1&0x7fff)|(es2&0x8000));
++        return x;
++}
++
++libc_hidden_def(copysignl);