toolchain/toolchain-buildroot: enable glibc for all little-endian ARCs with atomic ops

Initially we had a port only for ARCv2 cores but then with a simple
change ARCompact cores got supported as well.

So we generalize from BR2_archs to BR2_arcle as we haven't tried to
get glibc working on big-endian ARCs yet.

Also we never bothered to check avaialbility of atomic instructions in
the core but in case of Glibc for ARC this is really a must, so we add
this check here.

Note in case of uClibc we may have system w/o HW atomics but:

 1. Only single-core systems are allowed
 2. Atomic instructions are emulated via arc_usr_cmpxchg syscall

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

diff --git a/toolchain/toolchain-buildroot/Config.in b/toolchain/toolchain-buildroot/Config.in
index 7d9428c70ed03377a6625a1379a29404da0274fb..beb17a218b579a4e5f2e7db826c0fb8188fa94bc 100644 (file)
--- a/toolchain/toolchain-buildroot/Config.in
+++ b/toolchain/toolchain-buildroot/Config.in
@@ -48,7 +48,7 @@ config BR2_TOOLCHAIN_BUILDROOT_GLIBC
                   BR2_powerpc     || BR2_powerpc64  || BR2_powerpc64le || \
                   BR2_riscv       || BR2_sh         || BR2_sparc64     || \
                   BR2_x86_64      || BR2_microblaze || BR2_nios2       || \
-                  BR2_archs38
+                  (BR2_arcle && BR2_ARC_ATOMIC_EXT)
        depends on BR2_USE_MMU
        depends on !BR2_STATIC_LIBS
        depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2