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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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85
configure vendored
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@@ -2922,6 +2922,52 @@ $as_echo "$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; ${as_lineno_stack:+:} unset as_lineno
} # ac_fn_c_check_decl
# ac_fn_c_compute_int LINENO EXPR VAR INCLUDES
# --------------------------------------------
# Tries to find the compile-time value of EXPR in a program that includes
@@ -17654,8 +17700,30 @@ fi
rm -f core conftest.err conftest.$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 :
$as_echo_n "(cached) " >&6
@@ -17712,12 +17780,12 @@ if test "$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.$ac_ext
/* end confdefs.h. */
#include <stdlib.h>
#include <netdb.h>
#include <netdb.h>
int
main ()
{
@@ -17740,12 +17808,12 @@ fi
rm -f core conftest.err conftest.$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 ()
{
@@ -17767,6 +17835,7 @@ $as_echo "no" >&6; }
fi
rm -f core conftest.err conftest.$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 :