From e6923caaec6312ea374822634df9f7621f31fe74 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adrien=20Gallou=C3=ABt?= <angt@huggingface.co>
Date: Wed, 26 Nov 2025 14:14:41 +0100
Subject: [PATCH] ggml : fix ARM feature verification (#17519)
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On arm64 with `cmake` version 3.31.6, the final feature verification fails:

    -- ARM detected flags: -mcpu=neoverse-v2+crc+sve2-aes+sve2-sha3+nossbs
    -- Performing Test GGML_MACHINE_SUPPORTS_dotprod
    -- Performing Test GGML_MACHINE_SUPPORTS_dotprod - Success
    -- Performing Test GGML_MACHINE_SUPPORTS_i8mm
    -- Performing Test GGML_MACHINE_SUPPORTS_i8mm - Success
    -- Performing Test GGML_MACHINE_SUPPORTS_sve
    -- Performing Test GGML_MACHINE_SUPPORTS_sve - Success
    -- Performing Test GGML_MACHINE_SUPPORTS_sme
    -- Performing Test GGML_MACHINE_SUPPORTS_sme - Failed
    -- Performing Test GGML_MACHINE_SUPPORTS_nosme
    -- Performing Test GGML_MACHINE_SUPPORTS_nosme - Success
    -- Checking for ARM features using flags:
    --   -U__ARM_FEATURE_SME
    --   -mcpu=neoverse-v2+crc+sve2-aes+sve2-sha3+nossbs+dotprod+i8mm+sve+nosme
    -- Performing Test HAVE_DOTPROD
    -- Performing Test HAVE_DOTPROD - Failed
    -- Performing Test HAVE_SVE
    -- Performing Test HAVE_SVE - Failed
    -- Performing Test HAVE_MATMUL_INT8
    -- Performing Test HAVE_MATMUL_INT8 - Failed
    -- Performing Test HAVE_FMA
    -- Performing Test HAVE_FMA - Success
    -- Performing Test HAVE_FP16_VECTOR_ARITHMETIC
    -- Performing Test HAVE_FP16_VECTOR_ARITHMETIC - Failed
    -- Performing Test HAVE_SME
    -- Performing Test HAVE_SME - Failed
    -- Adding CPU backend variant ggml-cpu: -U__ARM_FEATURE_SME;-mcpu=neoverse-v2+crc+sve2-aes+sve2-sha3+nossbs+dotprod+i8mm+sve+nosme

We need to explicitly replace `;` with spaces from the list to make
`CMAKE_REQUIRED_FLAGS` work correctly...

Signed-off-by: Adrien Gallouët <angt@huggingface.co>
---
 ggml/src/ggml-cpu/CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ggml/src/ggml-cpu/CMakeLists.txt b/ggml/src/ggml-cpu/CMakeLists.txt
index feb5617386..7e53a57b7b 100644
--- a/ggml/src/ggml-cpu/CMakeLists.txt
+++ b/ggml/src/ggml-cpu/CMakeLists.txt
@@ -224,7 +224,8 @@ function(ggml_add_cpu_backend_variant_impl tag_name)
 
             include(CheckCXXSourceCompiles)
             set(CMAKE_REQUIRED_FLAGS_SAVE ${CMAKE_REQUIRED_FLAGS})
-            set(CMAKE_REQUIRED_FLAGS "${ARCH_FLAGS}")
+            string(REPLACE ";" " " ARCH_FLAGS_STR "${ARCH_FLAGS}")
+            set(CMAKE_REQUIRED_FLAGS "${ARCH_FLAGS_STR}")
             foreach(feature DOTPROD SVE MATMUL_INT8 FMA FP16_VECTOR_ARITHMETIC SME)
                 set(ARM_FEATURE "HAVE_${feature}")
                 check_cxx_source_compiles(