Disable custom reduction operators in 32-bit Windows

Addresses #246.

Author: simonbyrne

.appveyor.yml

@@ -8,10 +8,6 @@ platform:
   - x86 # 32-bit
   - x64 # 64-bit
 
-matrix:
-  allow_failures:
-  - platform: x86
-
 branches:
   only:
     - master

src/operators.jl

@@ -44,6 +44,10 @@ function _mpi_user_function(_a::Ptr{Nothing}, _b::Ptr{Nothing}, _len::Ptr{Cint},
 end
 
 function user_op(opfunc::Function)
+    if Sys.iswindows() && Sys.WORD_SIZE == 32
+        error("Custom reduction operators are not supported on 32-bit Windows.\nSee https://github.com/JuliaParallel/MPI.jl/issues/246 for more details.")
+    end
+    
     # we must initialize these at runtime, but it can't be done in __init__
     # since MPI.Init is not called yet.  So we do it lazily here:
     if _user_op.val == OP_NULL.val

test/runtests.jl

@@ -18,12 +18,6 @@ singlefiles = ["test_spawn.jl"]
 
 excludedfiles = String[]
 if Sys.iswindows()
-    push!(excludedfiles, "test_info.jl")
-    push!(excludedfiles, "test_onesided.jl")
-    push!(excludedfiles, "test_finalize_atexit.jl")
-    if Sys.WORD_SIZE == 32
-        push!(excludedfiles, "test_spawn.jl")
-    end
 end
 
 function runtests()

test/test_allreduce.jl

@@ -5,12 +5,18 @@ MPI.Init()
 
 comm_size = MPI.Comm_size(MPI.COMM_WORLD)
 
+if Sys.iswindows() && Sys.WORD_SIZE == 32
+    operators = [MPI.SUM, +]
+else
+    operators = [MPI.SUM, +, (x,y) -> 2x+y-x]
+end    
+
 for typ=[Int]
     for dims = [1, 2, 3]
         send_arr = zeros(typ, Tuple(3 for i in 1:dims))
         send_arr[:] .= 1:length(send_arr)
 
-        for op in (MPI.SUM, +, (x,y) -> 2x+y-x)
+        for op in operators
 
             # Non allocating version
             recv_arr = zeros(typ, size(send_arr))

test/test_reduce.jl

@@ -32,12 +32,18 @@ comm_size = MPI.Comm_size(MPI.COMM_WORLD)
 
 send_arr = Int[1, 2, 3]
 
+if Sys.iswindows() && Sys.WORD_SIZE == 32
+    operators = [MPI.SUM, +]
+else
+    operators = [MPI.SUM, +, (x,y) -> 2x+y-x]
+end    
+
 for typ=[Int]
     for dims = [1, 2, 3]
         send_arr = zeros(typ, Tuple(3 for i in 1:dims))
         send_arr[:] .= 1:length(send_arr)
 
-        for op in (MPI.SUM, +, (x,y) -> 2x+y-x)
+        for op in operators
 
             # Non allocating version
             recv_arr = zeros(typ, size(send_arr))