[Buildroot] [git commit branch/2023.02.x] package/mpir: force arm mode instead of Thumb mode

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=78333aa89a7303a7c69955c0b8c410fed0707901
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2023.02.x

Fix the following build failure:
/tmp/ccuwJnnt.s:124: Error: selected processor does not support `umull ip,r6,r2,r1' in Thumb mode
/tmp/ccuwJnnt.s:159: Error: selected processor does not support `umull ip,r0,r7,r1' in Thumb mode

Fixes:
http://autobuild.buildroot.net/results/610/61094bc7b7eb1d1e49bf8fcd1864b5cd3d7c4499/

Signed-off-by: Bernd Kuhls <bernd at kuhls.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
(cherry picked from commit ff037fe5430738e85d9c2270883e71cd77e99ff3)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/mpir/mpir.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/mpir/mpir.mk b/package/mpir/mpir.mk
index 91f704d30c..5dbd760aa1 100644
--- a/package/mpir/mpir.mk
+++ b/package/mpir/mpir.mk
@@ -36,4 +36,8 @@ ifeq ($(BR2_powerpc64le),y)
 MPIR_CONF_ENV += MPN_PATH="generic"
 endif
 
+ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
+MPIR_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -marm"
+endif
+
 $(eval $(autotools-package))