[Buildroot] [PATCH] libosip2: arc: Undefine __arc__ when building for ARC processors

[Mischa Jonker]

libosip2 appears to have support for the "ARC standard" (Advanced
RISC Computing), which is unrelated to Synopsys DesignWare ARC
processors. The check for this involves verifying the existence of
the "__arc__" macro. Unfortunately, this macro is also present
as a predefined built-in for the ARC processors, resulting into
build failures.

Signed-off-by: Mischa Jonker <mjonker at synopsys.com>
---
 package/libeXosip2/libeXosip2.mk |    4 ++++
 package/libosip2/libosip2.mk     |    4 ++++
 2 files changed, 8 insertions(+)

diff --git a/package/libeXosip2/libeXosip2.mk b/package/libeXosip2/libeXosip2.mk
index 4be2f05..76c4947 100644
--- a/package/libeXosip2/libeXosip2.mk
+++ b/package/libeXosip2/libeXosip2.mk
@@ -12,6 +12,10 @@ LIBEXOSIP2_LICENSE_FILES = COPYING
 
 LIBEXOSIP2_DEPENDENCIES = host-pkgconf libosip2
 
+ifeq ($(BR2_arc),y)
+LIBEXOSIP2_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -U__arc__"
+endif
+
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 LIBEXOSIP2_DEPENDENCIES += openssl
 LIBEXOSIP2_CONF_OPT += --enable-openssl
diff --git a/package/libosip2/libosip2.mk b/package/libosip2/libosip2.mk
index 6ae8149..6d5c516 100644
--- a/package/libosip2/libosip2.mk
+++ b/package/libosip2/libosip2.mk
@@ -10,6 +10,10 @@ LIBOSIP2_INSTALL_STAGING = YES
 LIBOSIP2_LICENSE = LGPLv2.1+
 LIBOSIP2_LICENSE_FILES = COPYING
 
+ifeq ($(BR2_arc),y)
+LIBOSIP2_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -U__arc__"
+endif
+
 LIBOSIP2_CONF_OPT = \
 	--enable-mt=$(if $(BR2_TOOLCHAIN_HAS_THREADS),yes,no)
 
-- 
1.7.9.5