enable testing -d:nimHasLibFFI mode (#13091)

tests/vm/mevalffi.nim

@@ -0,0 +1,67 @@
+# re-enable for windows once libffi can be installed in koch.nim
+# With win32 (not yet win64), libffi on windows works and this test passes.
+
+when defined(linux) or defined(bsd):
+  {.passL: "-lm".} # for exp
+proc c_exp(a: float64): float64 {.importc: "exp", header: "<math.h>".}
+
+proc c_printf(frmt: cstring): cint {.importc: "printf", header: "<stdio.h>", varargs, discardable.}
+
+const snprintfName = when defined(windows): "_snprintf" else: "snprintf"
+proc c_snprintf*(buffer: pointer, buf_size: uint, format: cstring): cint {.importc: snprintfName, header: "<stdio.h>", varargs .}
+
+proc c_malloc(size:uint):pointer {.importc:"malloc", header: "<stdlib.h>".}
+proc c_free(p: pointer) {.importc:"free", header: "<stdlib.h>".}
+
+proc fun() =
+  block: # c_exp
+    var x = 0.3
+    let b = c_exp(x)
+    let b2 = int(b*1_000_000) # avoids floating point equality
+    doAssert b2 == 1349858
+    doAssert c_exp(0.3) == c_exp(x)
+    const x2 = 0.3
+    doAssert c_exp(x2) == c_exp(x)
+
+  block: # c_printf
+    c_printf("foo\n")
+    c_printf("foo:%d\n", 100)
+    c_printf("foo:%d\n", 101.cint)
+    c_printf("foo:%d:%d\n", 102.cint, 103.cint)
+    let temp = 104.cint
+    c_printf("foo:%d:%d:%d\n", 102.cint, 103.cint, temp)
+    var temp2 = 105.cint
+    c_printf("foo:%g:%s:%d:%d\n", 0.03, "asdf", 103.cint, temp2)
+
+  block: # c_snprintf, c_malloc, c_free
+    let n: uint = 50
+    var buffer2: pointer = c_malloc(n)
+    var s: cstring = "foobar"
+    var age: cint = 25
+    discard c_snprintf(buffer2, n, "s1:%s s2:%s age:%d pi:%g", s, s, age, 3.14)
+    c_printf("ret={%s}\n", buffer2)
+    c_free(buffer2) # not sure it has an effect
+
+  block: # c_printf bug
+    var a = 123
+    var a2 = a.addr
+    #[
+    bug: different behavior between CT RT in this case:
+    at CT, shows foo2:a=123
+    at RT, shows foo2:a=<address as int>
+    ]#
+    if false:
+      c_printf("foo2:a=%d\n", a2)
+
+
+static:
+  fun()
+fun()
+
+import system/ansi_c
+block:
+  proc fun2()=
+    c_fprintf(cstderr, "hello world stderr\n")
+    write(stderr, "hi stderr\n")
+  static: fun2()
+  fun2()