Improve support for Julia 1.12-rc (#2888)

[only julia]

Co-authored-by: Tim Besard <tim.besard@gmail.com>

Author: kshyatt

.buildkite/pipeline.yml

@@ -31,8 +31,12 @@ steps:
             julia:
               - "1.10"
               - "1.11"
+              - "1.12-nightly"
               - "nightly"
           adjustments:
+            - with:
+                julia: "1.12-nightly"
+              soft_fail: true
             - with:
                 julia: "nightly"
               soft_fail: true

lib/cublas/linalg.jl

@@ -1,7 +1,10 @@
 # interfacing with LinearAlgebra standard library
 
 using LinearAlgebra: MulAddMul, AdjOrTrans, wrap, UpperOrLowerTriangular, rmul!, lmul!
-
+@static if VERSION ≥ v"1.12.0-rc"
+    # we need to use the generic wrapper to avoid dispatch to the 2x2or3x3 method
+    using LinearAlgebra: generic_matmatmul_wrapper!, BlasFlag
+end
 #
 # BLAS 1
 #
@@ -225,6 +228,13 @@ end
 #
 
 # GEMM
+
+@static if VERSION ≥ v"1.12.0-rc"
+    function LinearAlgebra.generic_matmatmul_wrapper!(C::StridedCuMatrix{T}, tA::AbstractChar, tB::AbstractChar, A::StridedCuVecOrMat{T}, B::StridedCuVecOrMat{T}, alpha::Number, beta::Number, val::LinearAlgebra.BlasFlag.SyrkHerkGemm) where {T<:CublasFloat}
+        LinearAlgebra.generic_matmatmul!(C, tA, tB, A, B, alpha, beta)
+    end
+end
+
 LinearAlgebra.generic_matmatmul!(C::StridedCuVecOrMat, tA, tB, A::StridedCuVecOrMat, B::StridedCuVecOrMat, _add::MulAddMul) =
     LinearAlgebra.generic_matmatmul!(C, tA, tB, A, B, _add.alpha, _add.beta)
 function LinearAlgebra.generic_matmatmul!(C::StridedCuVecOrMat, tA, tB, A::StridedCuVecOrMat, B::StridedCuVecOrMat, alpha::Number, beta::Number)