toolchain: Package libgomp

Some external toolchains may be configured to enable OpenMP. Provide a
package for these libraries which can be used by other packages.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

package/libs/toolchain/Makefile

@@ -275,6 +275,32 @@ define Package/libgfortran/config
 	endmenu
 endef
 
+define Package/libgomp
+$(call Package/gcc/Default)
+  TITLE:=OpenMP support library
+endef
+
+define Package/libgomp/config
+	menu "Configuration"
+		depends on EXTERNAL_TOOLCHAIN && PACKAGE_libgomp
+
+	config LIBGOMP_ROOT_DIR
+		string
+		prompt "libgomp shared library base directory"
+		depends on EXTERNAL_TOOLCHAIN && PACKAGE_libgomp
+		default TOOLCHAIN_ROOT  if !NATIVE_TOOLCHAIN
+		default "/"  if NATIVE_TOOLCHAIN
+
+	config LIBGOMP_FILE_SPEC
+		string
+		prompt "libgomp shared library files (use wildcards)"
+		depends on EXTERNAL_TOOLCHAIN && PACKAGE_libgomp
+		default "./lib/libgomp.so*"
+
+	endmenu
+endef
+
+
 define Package/ldd
 $(call Package/libc/Default)
   DEPENDS:=@!USE_MUSL
@@ -561,6 +587,14 @@ else
 	exit 0
   endef
 
+  define Package/libgomp/install
+	for file in $(call qstrip,$(CONFIG_LIBGOMP_FILE_SPEC)); do \
+		$(INSTALL_DIR) $(1)/lib ; \
+		$(CP) $(call qstrip,$(CONFIG_LIBGOMP_ROOT_DIR))/$$$$file $(1)/lib/ ; \
+	done ; \
+	exit 0
+  endef
+
   define Package/ldd/install
 	for file in $(call qstrip,$(CONFIG_LDD_FILE_SPEC)); do \
 		dir=`dirname $$$$file` ; \
@@ -590,5 +624,6 @@ $(eval $(call BuildPackage,libpthread))
 $(eval $(call BuildPackage,libthread-db))
 $(eval $(call BuildPackage,librt))
 $(eval $(call BuildPackage,libgfortran))
+$(eval $(call BuildPackage,libgomp))
 $(eval $(call BuildPackage,ldd))
 $(eval $(call BuildPackage,ldconfig))