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BuildSystem: Fix misdetection of gethostbyname_r() on NetBSD

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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
This commit is contained in:
Michał Górny
2021-11-11 03:05:02 +01:00
committed by Joshua Colp
parent eef29d24e1
commit 7b1e5fa34a
2 changed files with 107 additions and 28 deletions
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50
configure.ac
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@@ -952,28 +952,38 @@ 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.])])