[Msan] Fix the iconv.cc test to build and pass on FreeBSD

[eugenis]

LGTM

compiler-rt/trunk/lib/sanitizer_common/sanitizer_common_interceptors.inc

 #if SANITIZER_WINDOWS && !defined(va_copy)
 #define va_copy(dst, src) ((dst) = (src))
 #endif // _WIN32
 
 #if SANITIZER_FREEBSD
 #define pthread_setname_np pthread_set_name_np
 #define inet_aton __inet_aton
 #define inet_pton __inet_pton
+#define iconv __bsd_iconv
 #endif
 
 #ifndef COMMON_INTERCEPTOR_INITIALIZE_RANGE
 #define COMMON_INTERCEPTOR_INITIALIZE_RANGE(p, size) {}
 #endif
 
 #ifndef COMMON_INTERCEPTOR_UNPOISON_PARAM
 #define COMMON_INTERCEPTOR_UNPOISON_PARAM(count) {}

compiler-rt/trunk/lib/sanitizer_common/sanitizer_platform_interceptors.h

 #define SANITIZER_INTERCEPT_TEMPNAM SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_SINCOS SI_LINUX
 #define SANITIZER_INTERCEPT_REMQUO SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_LGAMMA SI_NOT_WINDOWS
 #define SANITIZER_INTERCEPT_LGAMMA_R SI_FREEBSD || SI_LINUX
 #define SANITIZER_INTERCEPT_LGAMMAL_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_DRAND48_R SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_RAND_R SI_MAC || SI_LINUX_NOT_ANDROID
-#define SANITIZER_INTERCEPT_ICONV SI_LINUX_NOT_ANDROID
+#define SANITIZER_INTERCEPT_ICONV SI_FREEBSD || SI_LINUX_NOT_ANDROID
 #define SANITIZER_INTERCEPT_TIMES SI_NOT_WINDOWS
 
 // FIXME: getline seems to be available on OSX 10.7
 #define SANITIZER_INTERCEPT_GETLINE SI_LINUX_NOT_ANDROID
 
 #define SANITIZER_INTERCEPT__EXIT SI_LINUX || SI_FREEBSD
 
 #define SANITIZER_INTERCEPT_PHTREAD_MUTEX SI_NOT_WINDOWS

compiler-rt/trunk/test/msan/iconv.cc

 
 int main(void) {
   iconv_t cd = iconv_open("ASCII", "ASCII");
   assert(cd != (iconv_t)-1);
 
   char inbuf_[100];
   strcpy(inbuf_, "sample text");
   char outbuf_[100];
+#if defined(__FreeBSD__)
+  // FreeBSD's iconv() expects the 2nd argument be of type 'const char**'.
+  const char *inbuf = inbuf_;
+#else
   char *inbuf = inbuf_;
+#endif
   char *outbuf = outbuf_;
   size_t inbytesleft = strlen(inbuf_);
   size_t outbytesleft = sizeof(outbuf_);
 
 #ifdef POSITIVE
   {
     char u;
     char *volatile p = &u;