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