Allow specifying worker launcher and cmdline flags in the test

Author: yuyichao

test/runtests.jl

@@ -10,6 +10,18 @@ else
     typemax(Csize_t)
 end
 
+if haskey(ENV, "JULIA_TEST_EXEFLAGS")
+    const test_exeflags = `$(Base.shell_split(ENV["JULIA_TEST_EXEFLAGS"]))`
+else
+    const test_exeflags = `--check-bounds=yes --startup-file=no --depwarn=error`
+end
+
+if haskey(ENV, "JULIA_TEST_EXENAME")
+    const test_exename = `$(Base.shell_split(ENV["JULIA_TEST_EXENAME"]))`
+else
+    const test_exename = `$(joinpath(JULIA_HOME, Base.julia_exename()))`
+end
+
 const node1_tests = String[]
 function move_to_node1(t)
     if t in tests
@@ -27,7 +39,7 @@ cd(dirname(@__FILE__)) do
     n = 1
     if net_on
         n = min(Sys.CPU_CORES, length(tests))
-        n > 1 && addprocs(n; exeflags=`--check-bounds=yes --startup-file=no --depwarn=error`)
+        n > 1 && addprocs(n; exename=test_exename, exeflags=test_exeflags)
         BLAS.set_num_threads(1)
     end
 
@@ -50,7 +62,7 @@ cd(dirname(@__FILE__)) do
                     if (isa(resp, Integer) && (resp > max_worker_rss)) || isa(resp, Exception)
                         if n > 1
                             rmprocs(p, waitfor=0.5)
-                            p = addprocs(1; exeflags=`--check-bounds=yes --startup-file=no --depwarn=error`)[1]
+                            p = addprocs(1; exename=test_exename, exeflags=test_exeflags)[1]
                             remotecall_fetch(()->include("testdefs.jl"), p)
                         else
                             # single process testing, bail if mem limit reached, or, on an exception.