Hi,

Upstream wants to use glibc features but doesn't actually try to
detect it in a way that doesn't affect other platforms.  This may fix
other architectures, not just riscv64.  amd64, i386, armv7 and arm64
are not affected because there dosbox.h doesn't define
HAS_LONG_DOUBLE.

ok?

Index: Makefile
===================================================================
RCS file: /cvs/ports/emulators/dosbox-x/Makefile,v
diff -u -p -r1.3 Makefile
--- Makefile	28 Mar 2024 10:26:04 -0000	1.3
+++ Makefile	19 Apr 2024 15:41:09 -0000
@@ -4,6 +4,7 @@ VERSION=	2024.03.01
 DISTNAME=	dosbox-x-v${VERSION}
 PKGNAME=	dosbox-x-${VERSION}
 CATEGORIES=	games x11 emulators
+REVISION=	0
 
 GH_ACCOUNT=	joncampbell123
 GH_PROJECT=	dosbox-x
Index: patches/patch-src_fpu_fpu_instructions_longdouble_h
===================================================================
RCS file: patches/patch-src_fpu_fpu_instructions_longdouble_h
diff -N patches/patch-src_fpu_fpu_instructions_longdouble_h
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-src_fpu_fpu_instructions_longdouble_h	4 Mar 2024 08:53:15 -0000
@@ -0,0 +1,29 @@
+Index: src/fpu/fpu_instructions_longdouble.h
+--- src/fpu/fpu_instructions_longdouble.h.orig
++++ src/fpu/fpu_instructions_longdouble.h
+@@ -16,17 +16,21 @@
+  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+  */
+ 
+-#include <math.h> /* for isinf, etc */
++/* for isinf, etc.  glibc math.h includes features.h which in turn
++ * defines __GLIBC__ (needed below).
++ */
++#include <math.h>
++
+ #include "cpu/lazyflags.h"
+ 
+ #ifdef __GNUC__
+ # if defined(__MINGW32__) || (defined(MACOSX) && !defined(__arm64__))
+ #  include "fpu_control_x86.h"
+-# elif defined(ANDROID) || defined(__ANDROID__) || (defined(MACOSX) && defined(__arm64__)) || defined(EMSCRIPTEN) || defined(__powerpc__)
++# elif defined(__GLIBC__)
++#  include <fpu_control.h>
++# else
+ /* ? */
+ #  define _FPU_SETCW(x) /* dummy */
+-# else
+-#  include <fpu_control.h>
+ # endif
+ static inline void FPU_SyncCW(void) {
+     uint16_t tmp = fpu.cw | 0x80 | 0x3F; // HACK: Disable all FPU exceptions until DOSBox-X can catch and reflect FPU exceptions to the guest


-- 
jca