Build bionic unit tests for musl

Modify bionic unit tests that are built for glibc so that they also
build against musl.  They don't all pass though:

With glibc:
 2 SLOW TESTS
 4 TIMEOUT TESTS
313 FAILED TESTS
  YOU HAVE 2 DISABLED TESTS

With musl:
11 SLOW TESTS
11 TIMEOUT TESTS
363 FAILED TESTS
  YOU HAVE 2 DISABLED TESTS

Bug: 190084016
Test: m bionic-unit-tests-glibc with musl
Test: atest bionic-unit-tests-static
Test: atest --host bionic-unit-tests-glibc with glibc
Change-Id: I79b6eab04fed3cc4392450df5eef2579412edfe1

1 files changed, 10 insertions, 3 deletions

diff --git a/tests/netdb_test.cpp b/tests/netdb_test.cpp
index a8056935b..020570762 100644
--- a/tests/netdb_test.cpp
+++ b/tests/netdb_test.cpp
@@ -265,11 +265,18 @@ TEST(netdb, gethostbyaddr_r) {
   ASSERT_EQ(0, hp->h_addr[0]);
 }
 
+#if defined(MUSL)
+// musl doesn't define NETDB_INTERNAL.  It also never sets *err to -1, but
+// since gethostbyname_r is a glibc extension, the difference in behavior
+// between musl and  glibc should probably be considered a bug in musl.
+#define NETDB_INTERNAL -1
+#endif
+
 TEST(netdb, gethostbyname_r_ERANGE) {
   hostent hent;
   hostent *hp;
   char buf[4]; // Use too small buffer.
-  int err;
+  int err = 0;
   int result = gethostbyname_r("localhost", &hent, buf, sizeof(buf), &hp, &err);
   EXPECT_EQ(NETDB_INTERNAL, err);
   EXPECT_EQ(ERANGE, result);
@@ -280,7 +287,7 @@ TEST(netdb, gethostbyname2_r_ERANGE) {
   hostent hent;
   hostent *hp;
   char buf[4]; // Use too small buffer.
-  int err;
+  int err = 0;
   int result = gethostbyname2_r("localhost", AF_INET, &hent, buf, sizeof(buf), &hp, &err);
   EXPECT_EQ(NETDB_INTERNAL, err);
   EXPECT_EQ(ERANGE, result);
@@ -292,7 +299,7 @@ TEST(netdb, gethostbyaddr_r_ERANGE) {
   hostent hent;
   hostent *hp;
   char buf[4]; // Use too small buffer.
-  int err;
+  int err = 0;
   int result = gethostbyaddr_r(&addr, sizeof(addr), AF_INET, &hent, buf, sizeof(buf), &hp, &err);
   EXPECT_EQ(NETDB_INTERNAL, err);
   EXPECT_EQ(ERANGE, result);