[PATCH 1/3] config/x86: skip GNU binutils bug check for LLVM

[PATCH 1/3] config/x86: skip GNU binutils bug check for LLVM

[Dmitry Kozlyuk]

AVX512 was disabled when GNU binutils were missing or had a known bug,
even if LLVM binutils were used for the build,
because binutils-avx512-check.sh was invoked regardless and failed.
In particular, this was the case for FreeBSD with clang (default).
Run the check only when GNU binutils are used.

Fixes: 68b1f1cda5b4 ("build: check AVX512 rather than binutils version")
Cc: stable@dpdk.org
Cc: bruce.richardson@intel.com

Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---
 config/x86/meson.build | 7 ++++---
 lib/acl/meson.build    | 2 +-
 lib/fib/meson.build    | 2 +-
 3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/config/x86/meson.build b/config/x86/meson.build
index 29f3dea181..603359e55a 100644
--- a/config/x86/meson.build
+++ b/config/x86/meson.build
@@ -2,9 +2,10 @@
 # Copyright(c) 2017-2020 Intel Corporation
 
 # get binutils version for the workaround of Bug 97
-if not is_windows
-    binutils_ok = run_command(binutils_avx512_check)
-    if binutils_ok.returncode() != 0 and cc.has_argument('-mno-avx512f')
+binutils_ok = true
+if not is_windows and (is_linux or cc.get_id() == 'gcc')
+    binutils_ok = run_command(binutils_avx512_check).returncode() == 0
+    if not binutils_ok and cc.has_argument('-mno-avx512f')
         machine_args += '-mno-avx512f'
         warning('Binutils error with AVX512 assembly, disabling AVX512 support')
     endif
diff --git a/lib/acl/meson.build b/lib/acl/meson.build
index f3dc513846..fbe17f9454 100644
--- a/lib/acl/meson.build
+++ b/lib/acl/meson.build
@@ -36,7 +36,7 @@ if dpdk_conf.has('RTE_ARCH_X86')
     # compile AVX512 version if:
     # we are building 64-bit binary AND binutils can generate proper code
 
-    if dpdk_conf.has('RTE_ARCH_X86_64') and binutils_ok.returncode() == 0
+    if dpdk_conf.has('RTE_ARCH_X86_64') and binutils_ok
 
         # compile AVX512 version if either:
         # a. we have AVX512 supported in minimum instruction set
diff --git a/lib/fib/meson.build b/lib/fib/meson.build
index 593c8c47c8..9b848d0841 100644
--- a/lib/fib/meson.build
+++ b/lib/fib/meson.build
@@ -14,7 +14,7 @@ deps += ['rib']
 
 # compile AVX512 version if:
 # we are building 64-bit binary AND binutils can generate proper code
-if dpdk_conf.has('RTE_ARCH_X86_64') and binutils_ok.returncode() == 0
+if dpdk_conf.has('RTE_ARCH_X86_64') and binutils_ok
     # compile AVX512 version if either:
     # a. we have AVX512F supported in minimum instruction set baseline
     # b. it's not minimum instruction set, but supported by compiler
-- 
2.29.3

Re: [PATCH 1/3] config/x86: skip GNU binutils bug check for LLVM

[Bruce Richardson]

On Sat, Nov 13, 2021 at 12:48:24AM +0300, Dmitry Kozlyuk wrote:
> AVX512 was disabled when GNU binutils were missing or had a known bug,
> even if LLVM binutils were used for the build,
> because binutils-avx512-check.sh was invoked regardless and failed.
> In particular, this was the case for FreeBSD with clang (default).
> Run the check only when GNU binutils are used.
> 
> Fixes: 68b1f1cda5b4 ("build: check AVX512 rather than binutils version")
> Cc: stable@dpdk.org
> Cc: bruce.richardson@intel.com
> 
> Signed-off-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>

Acked-by: Bruce Richardson <bruce.richardson@intel.com>