Add mpiexecjl for windows

test/mpiexecjl.jl

@@ -1,6 +1,88 @@
 using Test, Pkg
 using MPI
 
+function my_julia_cmd(julia=joinpath(Sys.BINDIR, Base.julia_exename()); cpu_target::Union{Nothing,String} = nothing)
+    opts = Base.JLOptions()
+    if cpu_target === nothing
+        cpu_target = unsafe_string(opts.cpu_target)
+    end
+    image_file = unsafe_string(opts.image_file)
+    addflags = String[]
+    let compile = if opts.compile_enabled == 0
+                      "no"
+                  elseif opts.compile_enabled == 2
+                      "all"
+                  elseif opts.compile_enabled == 3
+                      "min"
+                  else
+                      "" # default = "yes"
+                  end
+        isempty(compile) || push!(addflags, "--compile=$compile")
+    end
+    let depwarn = if opts.depwarn == 1
+                      "yes"
+                  elseif opts.depwarn == 2
+                      "error"
+                  else
+                      "" # default = "no"
+                  end
+        isempty(depwarn) || push!(addflags, "--depwarn=$depwarn")
+    end
+    let check_bounds = if opts.check_bounds == 1
+                      "yes" # on
+                  elseif opts.check_bounds == 2
+                      "no" # off
+                  else
+                      "" # default = "auto"
+                  end
+        isempty(check_bounds) || push!(addflags, "--check-bounds=$check_bounds")
+    end
+    opts.can_inline == 0 && push!(addflags, "--inline=no")
+    opts.use_compiled_modules == 0 && push!(addflags, "--compiled-modules=no")
+    opts.opt_level == 2 || push!(addflags, "-O$(opts.opt_level)")
+    opts.opt_level_min == 0 || push!(addflags, "--min-optlevel=$(opts.opt_level_min)")
+    push!(addflags, "-g$(opts.debug_level)")
+    if opts.code_coverage != 0
+        # Forward the code-coverage flag only if applicable (if the filename is pid-dependent)
+        coverage_file = (opts.output_code_coverage != C_NULL) ?  unsafe_string(opts.output_code_coverage) : ""
+        if isempty(coverage_file) || occursin("%p", coverage_file)
+            if opts.code_coverage == 1
+                push!(addflags, "--code-coverage=user")
+            elseif opts.code_coverage == 2
+                push!(addflags, "--code-coverage=all")
+            elseif opts.code_coverage == 3
+                push!(addflags, "--code-coverage=@$(unsafe_string(opts.tracked_path))")
+            end
+            isempty(coverage_file) || push!(addflags, "--code-coverage=$coverage_file")
+        end
+    end
+    if opts.malloc_log == 1
+        push!(addflags, "--track-allocation=user")
+    elseif opts.malloc_log == 2
+        push!(addflags, "--track-allocation=all")
+    elseif opts.malloc_log == 3
+        push!(addflags, "--track-allocation=@$(unsafe_string(opts.tracked_path))")
+    end
+    if opts.color == 1
+        push!(addflags, "--color=yes")
+    elseif opts.color == 2
+        push!(addflags, "--color=no")
+    end
+    if opts.startupfile == 2
+        push!(addflags, "--startup-file=no")
+    end
+    if opts.use_sysimage_native_code == 0
+        push!(addflags, "--sysimage-native-code=no")
+    end
+    if opts.use_pkgimages == 0
+        push!(addflags, "--pkgimages=no")
+    else
+        # If pkgimage is set, malloc_log and code_coverage should not
+        @assert opts.malloc_log == 0 && opts.code_coverage == 0
+    end
+    return `$julia -C$cpu_target --sysimage=$image_file $addflags`
+end
+
 @testset "mpiexecjl" begin
     mktempdir() do dir
         # Install MPI locally, so that we can test the `--project` flag to
@@ -30,7 +112,7 @@ using MPI
         end
 
         # `Base.julia_cmd()` ensures keeping consistent flags when running subprocesses.
-        julia = Base.julia_cmd()
+        julia = my_julia_cmd()
         example = joinpath(@__DIR__, "..", "docs", "examples", "01-hello.jl")
         env = ["JULIA_BINDIR" => Sys.BINDIR]
         p = withenv(env...) do