[Buildroot] [PATCH v2] toolchain: Enable Glibc for all little-endian ARCs with atomic ops

[Buildroot] [PATCH v2] toolchain: Enable Glibc for all little-endian ARCs with atomic ops

[Alexey Brodkin]

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>
---

Changes v1 -> v2

 * Merge both conditions in one place [Thomas]

 toolchain/toolchain-buildroot/Config.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/toolchain/toolchain-buildroot/Config.in b/toolchain/toolchain-buildroot/Config.in
index 7d9428c70ed0..beb17a218b57 100644
--- 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
-- 
2.19.1

[Buildroot] [PATCH v2] toolchain: Enable Glibc for all little-endian ARCs with atomic ops

[Thomas Petazzoni]

Hello,

On Fri,  9 Nov 2018 23:09:49 +0300, Alexey Brodkin wrote:
> 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>
> ---

Applied to master, thanks.

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com