[QUESTION/PATCH] How to deal with 64bit long double on aarch64-w64-mingw32 and aarch64-pc-cygwin?

Hello.

Windows Arm64 ABI has `sizeof(long double) == 8` (https://godbolt.org/z/EYG74K67j) and `#define __LDBL_MANT_DIG__ 53` for which `aarch64-w64-mingw32` and `aarch64-pc-cygwin` build of `libm` fails on 

```
../../../code/cygwin/newlib/libm/ld/invtrig.h:32:2: error: #error "Unsupported long double format"
   32 | #error "Unsupported long double format"
      |  ^~~~~
```

How would you prefer to handle this situation?

If disabling build of 80bit and 128bit math functions is the answer, please let me ask you for your feedback on the attached patch.

Thank you,

Radek

---
From 595e6e42a47e39c6964e26c2147bffc0ffef2f52 Mon Sep 17 00:00:00 2001
From: Martin Vejbora <[email protected]>
Date: Tue, 28 Jan 2025 21:44:06 +0100
Subject: [PATCH] newlib: disable 80bit or 128bit long double math for
 aarch64-w64-mingw32 and aarch64-pc-cygwin
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Don't build long double newlib/libm for Windows on AArch64 as newlib/libm
supports only 80bit or 128bit long doubles. Use 64bit math functions where
needed.

The newlib/Makefile.in file was updated using autoreconf command.

Signed-off-by: Martin Vejbora <[email protected]>
Co-authored-by: Radek Barton <[email protected]>
---
 newlib/Makefile.in       | 60 +++++++++++++++++++++++++---------------
 newlib/configure         | 10 ++++++-
 newlib/libc/acinclude.m4 |  9 +++++-
 newlib/libm/Makefile.inc |  4 ++-
 4 files changed, 57 insertions(+), 26 deletions(-)

diff --git a/newlib/Makefile.in b/newlib/Makefile.in
index c5492c6b6..f850be805 100644
--- a/newlib/Makefile.in
+++ b/newlib/Makefile.in
@@ -974,9 +974,9 @@ check_PROGRAMS =
 @HAVE_FPMATH_H_TRUE@am__append_141 = 
 @HAVE_FPMATH_H_TRUE@am__append_142 = 
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_143 = $(libm_machine_aarch64_src)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__append_144 = $(libm_ld128_lsrc)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_145 = 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_146 = 
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__append_144 = $(libm_ld128_lsrc)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_145 = 
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_146 = 
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@am__append_147 = $(libm_machine_amdgcn_src)
 @HAVE_LIBM_MACHINE_ARM_TRUE@am__append_148 = $(libm_machine_arm_src)
 @HAVE_LIBM_MACHINE_I386_TRUE@am__append_149 = $(libm_machine_i386_src)
@@ -3262,6 +3262,32 @@ am__objects_159 = libm/fenv/libm_a-feclearexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/libm_a-fetestexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/libm_a-feupdateenv.$(OBJEXT)
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_161 = $(am__objects_160)
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
@@ -3275,20 +3301,7 @@ am__objects_159 = libm/fenv/libm_a-feclearexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__objects_163 = $(am__objects_162)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__objects_163 = $(am__objects_162)
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@am__objects_164 = libm/machine/amdgcn/libm_a-v64_mathcnst.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/libm_a-v64_reent.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/libm_a-v64df_acos.$(OBJEXT) \
@@ -4006,6 +4019,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 shared_machine_dir = @shared_machine_dir@
 sharedstatedir = @sharedstatedir@
@@ -5099,11 +5113,11 @@ libm_test_test_LDADD = $(CRT0) libm.a libc.a
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/fetestexcept.c \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/feupdateenv.c
 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_ld128_lsrc = \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/s_logl.c libm/ld128/b_tgammal.c libm/ld128/invtrig.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_ld128_lsrc = \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/s_logl.c libm/ld128/b_tgammal.c libm/ld128/invtrig.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
 
 @HAVE_LIBM_MACHINE_RISCV_TRUE@libm_ld128_lsrc = \
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
@@ -5111,7 +5125,7 @@ libm_test_test_LDADD = $(CRT0) libm.a libc.a
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
 @HAVE_LIBM_MACHINE_RISCV_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@libm_machine_amdgcn_src = \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/v64_mathcnst.c \
diff --git a/newlib/configure b/newlib/configure
index 33a2ed1c5..004a4a997 100755
--- a/newlib/configure
+++ b/newlib/configure
@@ -6198,7 +6198,15 @@ else
 fi
 
 
- if test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h"; then
+case $host in
+  aarch64-*-mingw* | aarch64-*-cygwin*)
+    IS_AARCH64_WINDOWS=yes ;;
+  *)
+    IS_AARCH64_WINDOWS=no ;;
+esac
+
+
+ if (test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h") && (test $IS_AARCH64_WINDOWS = no); then
   HAVE_FPMATH_H_TRUE=
   HAVE_FPMATH_H_FALSE='#'
 else
diff --git a/newlib/libc/acinclude.m4 b/newlib/libc/acinclude.m4
index 52a6c57cf..ef9fc1d27 100644
--- a/newlib/libc/acinclude.m4
+++ b/newlib/libc/acinclude.m4
@@ -63,7 +63,14 @@ m4_foreach_w([MACHINE], [
   z8k
 ], [AM_CONDITIONAL([HAVE_LIBC_MACHINE_]m4_toupper(MACHINE), test "${machine_dir}" = MACHINE)])
 
-AM_CONDITIONAL(HAVE_FPMATH_H, test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h")
+case $host in
+  aarch64-*-mingw* | aarch64-*-cygwin*)
+    IS_AARCH64_WINDOWS=yes ;;
+  *)
+    IS_AARCH64_WINDOWS=no ;;
+esac
+
+AM_CONDITIONAL(HAVE_FPMATH_H, (test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h") && (test $IS_AARCH64_WINDOWS = no))
 
 
 AM_CONDITIONAL(MACH_ADD_SETJMP, test "x$mach_add_setjmp" = "xtrue")
diff --git a/newlib/libm/Makefile.inc b/newlib/libm/Makefile.inc
index bf31b1be7..c191a4473 100644
--- a/newlib/libm/Makefile.inc
+++ b/newlib/libm/Makefile.inc
@@ -55,8 +55,10 @@ include %D%/test/Makefile.inc
 
 if HAVE_LIBM_MACHINE_AARCH64
 include %D%/machine/aarch64/Makefile.inc
+if HAVE_FPMATH_H
 include %D%/ld128/Makefile.inc
-endif
+endif # HAVE_FPMATH_H
+endif # HAVE_LIBM_MACHINE_AARCH64
 if HAVE_LIBM_MACHINE_AMDGCN
 include %D%/machine/amdgcn/Makefile.inc
 endif
-- 
2.50.1.vfs.0.0

From 595e6e42a47e39c6964e26c2147bffc0ffef2f52 Mon Sep 17 00:00:00 2001
From: Martin Vejbora <[email protected]>
Date: Tue, 28 Jan 2025 21:44:06 +0100
Subject: [PATCH] newlib: disable 80bit or 128bit long double math for
 aarch64-w64-mingw32 and aarch64-pc-cygwin
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Don't build long double newlib/libm for Windows on AArch64 as newlib/libm
supports only 80bit or 128bit long doubles. Use 64bit math functions where
needed.

The newlib/Makefile.in file was updated using autoreconf command.

Signed-off-by: Martin Vejbora <[email protected]>
Co-authored-by: Radek Barton <[email protected]>
---
 newlib/Makefile.in       | 60 +++++++++++++++++++++++++---------------
 newlib/configure         | 10 ++++++-
 newlib/libc/acinclude.m4 |  9 +++++-
 newlib/libm/Makefile.inc |  4 ++-
 4 files changed, 57 insertions(+), 26 deletions(-)

diff --git a/newlib/Makefile.in b/newlib/Makefile.in
index c5492c6b6..f850be805 100644
--- a/newlib/Makefile.in
+++ b/newlib/Makefile.in
@@ -974,9 +974,9 @@ check_PROGRAMS =
 @HAVE_FPMATH_H_TRUE@am__append_141 = 
 @HAVE_FPMATH_H_TRUE@am__append_142 = 
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_143 = $(libm_machine_aarch64_src)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__append_144 = $(libm_ld128_lsrc)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_145 = 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_146 = 
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__append_144 = $(libm_ld128_lsrc)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_145 = 
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__append_146 = 
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@am__append_147 = $(libm_machine_amdgcn_src)
 @HAVE_LIBM_MACHINE_ARM_TRUE@am__append_148 = $(libm_machine_arm_src)
 @HAVE_LIBM_MACHINE_I386_TRUE@am__append_149 = $(libm_machine_i386_src)
@@ -3262,6 +3262,32 @@ am__objects_159 = libm/fenv/libm_a-feclearexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/libm_a-fetestexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/libm_a-feupdateenv.$(OBJEXT)
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_161 = $(am__objects_160)
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
+@HAVE_FPMATH_H_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
@@ -3275,20 +3301,7 @@ am__objects_159 = libm/fenv/libm_a-feclearexcept.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AARCH64_FALSE@@HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@am__objects_162 = libm/ld128/libm_a-e_powl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_erfl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_exp2l.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_expl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_logl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-b_tgammal.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-invtrig.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-e_lgammal_r.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_cosl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_sinl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-k_tanl.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_sinpil.$(OBJEXT) \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/libm_a-s_cospil.$(OBJEXT)
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__objects_163 = $(am__objects_162)
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@@HAVE_LONG_DOUBLE_TRUE@am__objects_163 = $(am__objects_162)
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@am__objects_164 = libm/machine/amdgcn/libm_a-v64_mathcnst.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/libm_a-v64_reent.$(OBJEXT) \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/libm_a-v64df_acos.$(OBJEXT) \
@@ -4006,6 +4019,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 shared_machine_dir = @shared_machine_dir@
 sharedstatedir = @sharedstatedir@
@@ -5099,11 +5113,11 @@ libm_test_test_LDADD = $(CRT0) libm.a libc.a
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/fetestexcept.c \
 @HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/machine/aarch64/feupdateenv.c
 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_ld128_lsrc = \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/s_logl.c libm/ld128/b_tgammal.c libm/ld128/invtrig.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_ld128_lsrc = \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/s_logl.c libm/ld128/b_tgammal.c libm/ld128/invtrig.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
 
 @HAVE_LIBM_MACHINE_RISCV_TRUE@libm_ld128_lsrc = \
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/e_powl.c libm/ld128/s_erfl.c libm/ld128/s_exp2l.c libm/ld128/s_expl.c \
@@ -5111,7 +5125,7 @@ libm_test_test_LDADD = $(CRT0) libm.a libc.a
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/e_lgammal_r.c libm/ld128/k_cosl.c libm/ld128/k_sinl.c \
 @HAVE_LIBM_MACHINE_RISCV_TRUE@	libm/ld128/k_tanl.c libm/ld128/s_sinpil.c libm/ld128/s_cospil.c
 
-@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
+@HAVE_FPMATH_H_TRUE@@HAVE_LIBM_MACHINE_AARCH64_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
 @HAVE_LIBM_MACHINE_RISCV_TRUE@libm_a_CFLAGS_libm_ld128 = -fbuiltin -fno-math-errno
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@libm_machine_amdgcn_src = \
 @HAVE_LIBM_MACHINE_AMDGCN_TRUE@	libm/machine/amdgcn/v64_mathcnst.c \
diff --git a/newlib/configure b/newlib/configure
index 33a2ed1c5..004a4a997 100755
--- a/newlib/configure
+++ b/newlib/configure
@@ -6198,7 +6198,15 @@ else
 fi
 
 
- if test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h"; then
+case $host in
+  aarch64-*-mingw* | aarch64-*-cygwin*)
+    IS_AARCH64_WINDOWS=yes ;;
+  *)
+    IS_AARCH64_WINDOWS=no ;;
+esac
+
+
+ if (test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h") && (test $IS_AARCH64_WINDOWS = no); then
   HAVE_FPMATH_H_TRUE=
   HAVE_FPMATH_H_FALSE='#'
 else
diff --git a/newlib/libc/acinclude.m4 b/newlib/libc/acinclude.m4
index 52a6c57cf..ef9fc1d27 100644
--- a/newlib/libc/acinclude.m4
+++ b/newlib/libc/acinclude.m4
@@ -63,7 +63,14 @@ m4_foreach_w([MACHINE], [
   z8k
 ], [AM_CONDITIONAL([HAVE_LIBC_MACHINE_]m4_toupper(MACHINE), test "${machine_dir}" = MACHINE)])
 
-AM_CONDITIONAL(HAVE_FPMATH_H, test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h")
+case $host in
+  aarch64-*-mingw* | aarch64-*-cygwin*)
+    IS_AARCH64_WINDOWS=yes ;;
+  *)
+    IS_AARCH64_WINDOWS=no ;;
+esac
+
+AM_CONDITIONAL(HAVE_FPMATH_H, (test -r "${srcdir}/libc/machine/${machine_dir}/machine/_fpmath.h") && (test $IS_AARCH64_WINDOWS = no))
 
 
 AM_CONDITIONAL(MACH_ADD_SETJMP, test "x$mach_add_setjmp" = "xtrue")
diff --git a/newlib/libm/Makefile.inc b/newlib/libm/Makefile.inc
index bf31b1be7..c191a4473 100644
--- a/newlib/libm/Makefile.inc
+++ b/newlib/libm/Makefile.inc
@@ -55,8 +55,10 @@ include %D%/test/Makefile.inc
 
 if HAVE_LIBM_MACHINE_AARCH64
 include %D%/machine/aarch64/Makefile.inc
+if HAVE_FPMATH_H
 include %D%/ld128/Makefile.inc
-endif
+endif # HAVE_FPMATH_H
+endif # HAVE_LIBM_MACHINE_AARCH64
 if HAVE_LIBM_MACHINE_AMDGCN
 include %D%/machine/amdgcn/Makefile.inc
 endif
-- 
2.50.1.vfs.0.0