mpfr: Fix compilation for ARC

MPFR has a couple of things implemented in assembly and in case of
ARC those parts were written long ago when ARC GCC port was not yet
upstreamed. On upstreaming of GCC some constraints were changed and
so we can no longer build MPFR for ARC with up-to-date tools seeing
something like that:
| In file included from ../../mpfr-4.0.1/src/mpfr-impl.h:112,
|                  from ../../mpfr-4.0.1/src/mul.c:24:
| ../../mpfr-4.0.1/src/mul.c: In function 'mpfr_mul':
| ../../mpfr-4.0.1/src/mpfr-longlong.h:415:3: error: impossible constraint in 'asm'
|    __asm__ ("add.f\t%1, %4, %5\n\tadc\t%0, %2, %3"   \
|    ^~~~~~~

(From OE-Core rev: 887a062ca139014ae6dfd1919e0ff9a5ef4db35e)

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/mpfr/mpfr/0001-Fix-obsolete-ARC-asm-constraints.patch

@@ -0,0 +1,45 @@
+mpfr-longlong.h: Fix obsolete ARC asm constraints
+
+This patch replaces obsolete ARC "J" asm constraint with
+up-to-date "Cal" constraint.
+
+"J" constraint only existed in pre-upstream GCC port for ARC.
+In current upstream port "Cal" constraint is used which leads
+to compile-time error.
+
+Proposed fix is known to work in Buildroot, Crosstool-NG etc.
+
+[1] https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=09cb6a17e71bd40d2fbfaf82a1502fc210e33c87
+
+Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
+Signed-off-by: Vlad Zakharov <vzakhar@synopsys.com>
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+
+Upstream-Status: Backport [https://gforge.inria.fr/scm/viewvc.php/mpfr?view=revision&revision=13251]
+---
+Index: src/mpfr-longlong.h
+===================================================================
+--- a/src/mpfr-longlong.h	(revision 10963)
++++ b/src/mpfr-longlong.h	(working copy)
+@@ -416,17 +416,17 @@
+ 	   : "=r" (sh),							\
+ 	     "=&r" (sl)							\
+ 	   : "r"  ((USItype) (ah)),					\
+-	     "rIJ" ((USItype) (bh)),					\
++	     "rICal" ((USItype) (bh)),					\
+ 	     "%r" ((USItype) (al)),					\
+-	     "rIJ" ((USItype) (bl)))
++	     "rICal" ((USItype) (bl)))
+ #define sub_ddmmss(sh, sl, ah, al, bh, bl) \
+   __asm__ ("sub.f\t%1, %4, %5\n\tsbc\t%0, %2, %3"			\
+ 	   : "=r" (sh),							\
+ 	     "=&r" (sl)							\
+ 	   : "r" ((USItype) (ah)),					\
+-	     "rIJ" ((USItype) (bh)),					\
++	     "rICal" ((USItype) (bh)),					\
+ 	     "r" ((USItype) (al)),					\
+-	     "rIJ" ((USItype) (bl)))
++	     "rICal" ((USItype) (bl)))
+ #endif
+ 
+ #if defined (__arm__) && (defined (__thumb2__) || !defined (__thumb__)) \

meta/recipes-support/mpfr/mpfr_4.0.1.bb

@@ -9,7 +9,8 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=d32239bcb673463ab874e80d47fae504 \
 		    file://COPYING.LESSER;md5=6a6a8e020838b23406c81b19c1d46df6"
 DEPENDS = "gmp autoconf-archive"
 
-SRC_URI = "http://www.mpfr.org/mpfr-${PV}/mpfr-${PV}.tar.xz"
+SRC_URI = "http://www.mpfr.org/mpfr-${PV}/mpfr-${PV}.tar.xz \
+           file://0001-Fix-obsolete-ARC-asm-constraints.patch"
 SRC_URI[md5sum] = "b8dd19bd9bb1ec8831a6a582a7308073"
 SRC_URI[sha256sum] = "67874a60826303ee2fb6affc6dc0ddd3e749e9bfcb4c8655e3953d0458a6e16e"