package/oprofile: introduce a BR2_PACKAGE_OPROFILE_ARCH_SUPPORTS

operf_utils.h defines rmb() for a limited number of architectures, so
add this list to BR2_PACKAGE_OPROFILE_ARCH_SUPPORTS to disable any new
or unsupported architectures.

Doing so, this disable oprofile for m68k which lack of memory barrier
operations.

Remove nios2 dependency since it's not supported by oprofile even if
binutils could be built for nios2.

Fixes:

 http://autobuild.buildroot.net/results/1cc761d8a5715d0a2c6eaacfde7e44b225da1b36

Signed-off-by: Romain Naour <romain.naour@gmail.com>
[Thomas: remove BR2_sh64, use BR2_sh instead of BR2_sh4.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/oprofile/Config.in

@@ -1,3 +1,13 @@
+# memory barrier function implemented only for some architectures
+config BR2_PACKAGE_OPROFILE_ARCH_SUPPORTS
+	bool
+	default y
+	depends on BR2_arceb || BR2_arcle || BR2_arm || BR2_armeb || \
+		BR2_aarch64 || BR2_aarch64_be || BR2_i386 || BR2_mips || \
+		BR2_mipsel || BR2_mips64 || BR2_mips64el || BR2_powerpc || \
+		BR2_powerpc64 || BR2_powerpc64le || BR2_sh || \
+		BR2_sparc || BR2_sparc64 || BR2_x86_64
+
 config BR2_PACKAGE_OPROFILE
 	bool "oprofile"
 	depends on BR2_USE_MMU # fork()
@@ -5,10 +15,8 @@ config BR2_PACKAGE_OPROFILE
 	select BR2_PACKAGE_BINUTILS
 	select BR2_PACKAGE_LIBPFM4 if BR2_powerpc
 	depends on BR2_INSTALL_LIBSTDCPP
-	depends on !BR2_nios2 # binutils
 	depends on BR2_USE_WCHAR # binutils
-	# no memory barrier functions
-	depends on !BR2_xtensa && !BR2_microblaze
+	depends on BR2_PACKAGE_OPROFILE_ARCH_SUPPORTS
 	# libpfm4 is needed on PowerPC, and requires thread support
 	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL || !BR2_powerpc
 	help
@@ -29,7 +37,7 @@ config BR2_PACKAGE_OPROFILE
 
 comment "oprofile needs a toolchain w/ C++, wchar"
 	depends on BR2_USE_MMU
-	depends on !BR2_nios2 && !BR2_xtensa && !BR2_microblaze
+	depends on BR2_PACKAGE_OPROFILE_ARCH_SUPPORTS
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_USE_WCHAR
 
 comment "oprofile needs a toolchain w/ NPTL on PPC"