BuildSystem: Fix misdetection of gethostbyname_r() on NetBSD

Fix the configure script not to detect the presence of gethostbyname_r()
on NetBSD incorrectly.  NetBSD includes it as an internal libc symbol
that is not exposed in system headers and that is incompatible with
other implementations.  In order to avoid misdetecting it, perform
the symbol check only if the declaration is found in the public header
first.

ASTERISK-29817

Change-Id: Iafa359b09908251bcd299ff54be003ea129b9eda

diff --git a/configure b/configure
index 2a94585c78d91b615f010310c0ab88be3d09c0b5..b07556b0a8042d5d6ba6cd00b7c92b4fede05187 100755 (executable)
--- a/configure
+++ b/configure
@@ -2914,6 +2914,52 @@ $as_echo "$ac_res" >&6; }
 
 } # ac_fn_c_check_member
 
+# ac_fn_c_check_decl LINENO SYMBOL VAR INCLUDES
+# ---------------------------------------------
+# Tests whether SYMBOL is declared in INCLUDES, setting cache variable VAR
+# accordingly.
+ac_fn_c_check_decl ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  as_decl_name=`echo $2|sed 's/ *(.*//'`
+  as_decl_use=`echo $2|sed -e 's/(/((/' -e 's/)/) 0&/' -e 's/,/) 0& (/g'`
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether $as_decl_name is declared" >&5
+$as_echo_n "checking whether $as_decl_name is declared... " >&6; }
+if eval \${$3+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+$4
+int
+main ()
+{
+#ifndef $as_decl_name
+#ifdef __cplusplus
+  (void) $as_decl_use;
+#else
+  (void) $as_decl_name;
+#endif
+#endif
+
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+              { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; ${as_lineno_stack:+:} unset as_lineno
+
+} # ac_fn_c_check_decl
+
 # ac_fn_c_compute_int LINENO EXPR VAR INCLUDES
 # --------------------------------------------
 # Tries to find the compile-time value of EXPR in a program that includes
@@ -17622,8 +17668,30 @@ fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
-# some systems already have gethostbyname_r so we don't need to build ours in main/utils.c
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing gethostbyname_r" >&5
+# NetBSD libc ships with an internal-only incompatible symbol gethostbyname_r
+ac_fn_c_check_decl "$LINENO" "gethostbyname_r" "ac_cv_have_decl_gethostbyname_r" "#include <stdlib.h>
+         #include <netdb.h>
+
+"
+if test "x$ac_cv_have_decl_gethostbyname_r" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_GETHOSTBYNAME_R $ac_have_decl
+_ACEOF
+if test $ac_have_decl = 1; then :
+  have_gethostbyname_r_public_declaration=yes
+else
+  have_gethostbyname_r_public_declaration=no
+fi
+
+
+if test "x$have_gethostbyname_r_public_declaration" = "xyes"; then
+        # some systems already have gethostbyname_r so we don't need to build ours in main/utils.c
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing gethostbyname_r" >&5
 $as_echo_n "checking for library containing gethostbyname_r... " >&6; }
 if ${ac_cv_search_gethostbyname_r+:} false; then :
   $as_echo_n "(cached) " >&6
@@ -17680,12 +17748,12 @@ if test "$ac_res" != no; then :
 fi
 
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostbyname_r with 6 arguments" >&5
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostbyname_r with 6 arguments" >&5
 $as_echo_n "checking for gethostbyname_r with 6 arguments... " >&6; }
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdlib.h>
-                         #include <netdb.h>
+                                 #include <netdb.h>
 int
 main ()
 {
@@ -17708,12 +17776,12 @@ fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostbyname_r with 5 arguments" >&5
+        { $as_echo "$as_me:${as_lineno-$LINENO}: checking for gethostbyname_r with 5 arguments" >&5
 $as_echo_n "checking for gethostbyname_r with 5 arguments... " >&6; }
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+        cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #include <stdlib.h>
-                        #include <netdb.h>
+                                #include <netdb.h>
 int
 main ()
 {
@@ -17735,6 +17803,7 @@ $as_echo "no" >&6; }
 fi
 rm -f core conftest.err conftest.$ac_objext \
     conftest$ac_exeext conftest.$ac_ext
+fi
 
 ac_fn_c_check_header_mongrel "$LINENO" "byteswap.h" "ac_cv_header_byteswap_h" "$ac_includes_default"
 if test "x$ac_cv_header_byteswap_h" = xyes; then :

diff --git a/configure.ac b/configure.ac
index 8675ad6f244e2681df76a3f271b60973e87b4d0d..efbf306500a7fb64b13004bdcfd6d8490f9da796 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -950,28 +950,38 @@ AC_LINK_IFELSE(
                AC_MSG_RESULT(no)
 )
 
-# some systems already have gethostbyname_r so we don't need to build ours in main/utils.c
-AC_SEARCH_LIBS(gethostbyname_r, [socket nsl])
-
-AC_MSG_CHECKING(for gethostbyname_r with 6 arguments)
-AC_LINK_IFELSE(
-        [AC_LANG_PROGRAM([#include <stdlib.h>
-                         #include <netdb.h>],
-                        [struct hostent *he = gethostbyname_r((const char *)NULL, (struct hostent *)NULL, (char *)NULL, (int)0, (struct hostent **)NULL, (int *)NULL);])],
-        AC_MSG_RESULT(yes)
-        AC_DEFINE([HAVE_GETHOSTBYNAME_R_6], 1, [Define to 1 if your system has gethostbyname_r with 6 arguments.]),
-        AC_MSG_RESULT(no)
+# NetBSD libc ships with an internal-only incompatible symbol gethostbyname_r
+AC_CHECK_DECLS([gethostbyname_r],
+        [have_gethostbyname_r_public_declaration=yes],
+        [have_gethostbyname_r_public_declaration=no],
+        [#include <stdlib.h>
+         #include <netdb.h>]
 )
 
-AC_MSG_CHECKING(for gethostbyname_r with 5 arguments)
-AC_LINK_IFELSE(
-        [AC_LANG_PROGRAM([#include <stdlib.h>
-                        #include <netdb.h>],
-                        [struct hostent *he = gethostbyname_r((const char *)NULL, (struct hostent *)NULL, (char *)NULL, (int)0, (int *)NULL);])],
-        AC_MSG_RESULT(yes)
-        AC_DEFINE([HAVE_GETHOSTBYNAME_R_5], 1, [Define to 1 if your system has gethostbyname_r with 5 arguments.]),
-        AC_MSG_RESULT(no)
-)
+if test "x$have_gethostbyname_r_public_declaration" = "xyes"; then
+        # some systems already have gethostbyname_r so we don't need to build ours in main/utils.c
+        AC_SEARCH_LIBS(gethostbyname_r, [socket nsl])
+
+        AC_MSG_CHECKING(for gethostbyname_r with 6 arguments)
+        AC_LINK_IFELSE(
+                [AC_LANG_PROGRAM([#include <stdlib.h>
+                                 #include <netdb.h>],
+                                [struct hostent *he = gethostbyname_r((const char *)NULL, (struct hostent *)NULL, (char *)NULL, (int)0, (struct hostent **)NULL, (int *)NULL);])],
+                AC_MSG_RESULT(yes)
+                AC_DEFINE([HAVE_GETHOSTBYNAME_R_6], 1, [Define to 1 if your system has gethostbyname_r with 6 arguments.]),
+                AC_MSG_RESULT(no)
+        )
+
+        AC_MSG_CHECKING(for gethostbyname_r with 5 arguments)
+        AC_LINK_IFELSE(
+                [AC_LANG_PROGRAM([#include <stdlib.h>
+                                #include <netdb.h>],
+                                [struct hostent *he = gethostbyname_r((const char *)NULL, (struct hostent *)NULL, (char *)NULL, (int)0, (int *)NULL);])],
+                AC_MSG_RESULT(yes)
+                AC_DEFINE([HAVE_GETHOSTBYNAME_R_5], 1, [Define to 1 if your system has gethostbyname_r with 5 arguments.]),
+                AC_MSG_RESULT(no)
+        )
+fi
 
 AC_CHECK_HEADER([byteswap.h], [AC_DEFINE_UNQUOTED([HAVE_BYTESWAP_H], 1, [Define to 1 if byteswap.h macros are available.])])