libgo/misc/cgo/test/issue3261.go

   1 // Copyright 2012 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package cgotest
   6
   7 /*
   8 // libgcc on ARM might be compiled as thumb code, but our 5l
   9 // can't handle that, so we have to disable this test on arm.
  10 #ifdef __ARMEL__
  11 #include <stdio.h>
  12 int vabs(int x) {
  13         puts("testLibgcc is disabled on ARM because 5l cannot handle thumb library.");
  14         return (x < 0) ? -x : x;
  15 }
  16 #elif defined(__arm64__) && defined(__clang__)
  17 #include <stdio.h>
  18 int vabs(int x) {
  19         puts("testLibgcc is disabled on ARM64 with clang due to lack of libgcc.");
  20         return (x < 0) ? -x : x;
  21 }
  22 #else
  23 int __absvsi2(int); // dummy prototype for libgcc function
  24 // we shouldn't name the function abs, as gcc might use
  25 // the builtin one.
  26 int vabs(int x) { return __absvsi2(x); }
  27 #endif
  28 */
  29 import "C"
  30
  31 import "testing"
  32
  33 func testLibgcc(t *testing.T) {
  34         var table = []struct {
  35                 in, out C.int
  36         }{
  37                 {0, 0},
  38                 {1, 1},
  39                 {-42, 42},
  40                 {1000300, 1000300},
  41                 {1 - 1<<31, 1<<31 - 1},
  42         }
  43         for _, v := range table {
  44                 if o := C.vabs(v.in); o != v.out {
  45                         t.Fatalf("abs(%d) got %d, should be %d", v.in, o, v.out)
  46                         return
  47                 }
  48         }
  49 }