libosip2: arc: Undefine __arc__ when building for ARC processors

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.

---
 package/libeXosip2/libeXosip2.mk |    4 ++++
 package/libosip2/libosip2.mk     |    4 ++++
 2 files changed, 8 insertions(+)

index 4be2f05..76c4947 100644
@@ -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

index 6ae8149..6d5c516 100644
@@ -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

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

Committed with a short comment in the .mk file about why we're doing this, thanks.

Bye, Peter Korsgaard