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Revert to the pre-8.2 method of probing for libm, that is, always

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include it if it links properly.  It seems too risky to assume that
standard functions like pow() are not special-cased by the compiler.
Per report from Andreas Lange that build fails on Solaris cc compiler
with -fast.  Even though we don't consider that a supported option,
I'm worried that similar issues will arise with other compilers.
This commit is contained in:
Tom Lane 2006-11-06 03:44:38 +00:00
parent 74686b6de7
commit 02f37bd8c4
3 changed files with 83 additions and 128 deletions
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199
configure vendored
View File

@ -5038,6 +5038,79 @@ _ACEOF
##
## Libraries
##
## Most libraries are included only if they demonstrably provide a function
## we need, but libm is an exception: always include it, because there are
## too many compilers that play cute optimization games that will break
## probes for standard functions such as pow().
##
echo "$as_me:$LINENO: checking for main in -lm" >&5
echo $ECHO_N "checking for main in -lm... $ECHO_C" >&6
if test "${ac_cv_lib_m_main+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
ac_check_lib_save_LIBS=$LIBS
LIBS="-lm $LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
main ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
(eval $ac_link) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest$ac_exeext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
ac_cv_lib_m_main=yes
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
ac_cv_lib_m_main=no
fi
rm -f conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
LIBS=$ac_check_lib_save_LIBS
fi
echo "$as_me:$LINENO: result: $ac_cv_lib_m_main" >&5
echo "${ECHO_T}$ac_cv_lib_m_main" >&6
if test $ac_cv_lib_m_main = yes; then
cat >>confdefs.h <<_ACEOF
#define HAVE_LIBM 1
_ACEOF
LIBS="-lm $LIBS"
fi
echo "$as_me:$LINENO: checking for library containing setproctitle" >&5
echo $ECHO_N "checking for library containing setproctitle... $ECHO_C" >&6
@ -5165,132 +5238,6 @@ if test "$ac_cv_search_setproctitle" != no; then
fi
echo "$as_me:$LINENO: checking for library containing pow" >&5
echo $ECHO_N "checking for library containing pow... $ECHO_C" >&6
if test "${ac_cv_search_pow+set}" = set; then
echo $ECHO_N "(cached) $ECHO_C" >&6
else
ac_func_search_save_LIBS=$LIBS
ac_cv_search_pow=no
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char pow ();
int
main ()
{
pow ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
(eval $ac_link) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest$ac_exeext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
ac_cv_search_pow="none required"
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
fi
rm -f conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
if test "$ac_cv_search_pow" = no; then
for ac_lib in m; do
LIBS="-l$ac_lib $ac_func_search_save_LIBS"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
/* Override any gcc2 internal prototype to avoid an error. */
#ifdef __cplusplus
extern "C"
#endif
/* We use char because int might match the return type of a gcc2
builtin and then its argument prototype would still apply. */
char pow ();
int
main ()
{
pow ();
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
(eval $ac_link) 2>conftest.er1
ac_status=$?
grep -v '^ *+' conftest.er1 >conftest.err
rm -f conftest.er1
cat conftest.err >&5
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); } &&
{ ac_try='test -z "$ac_c_werror_flag"
|| test ! -s conftest.err'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; } &&
{ ac_try='test -s conftest$ac_exeext'
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
(eval $ac_try) 2>&5
ac_status=$?
echo "$as_me:$LINENO: \$? = $ac_status" >&5
(exit $ac_status); }; }; then
ac_cv_search_pow="-l$ac_lib"
break
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
fi
rm -f conftest.err conftest.$ac_objext \
conftest$ac_exeext conftest.$ac_ext
done
fi
LIBS=$ac_func_search_save_LIBS
fi
echo "$as_me:$LINENO: result: $ac_cv_search_pow" >&5
echo "${ECHO_T}$ac_cv_search_pow" >&6
if test "$ac_cv_search_pow" != no; then
test "$ac_cv_search_pow" = "none required" || LIBS="$ac_cv_search_pow $LIBS"
fi
echo "$as_me:$LINENO: checking for library containing dlopen" >&5
echo $ECHO_N "checking for library containing dlopen... $ECHO_C" >&6
if test "${ac_cv_search_dlopen+set}" = set; then

9
configure.in
View File

@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $PostgreSQL: pgsql/configure.in,v 1.485 2006/10/30 22:15:04 petere Exp $
dnl $PostgreSQL: pgsql/configure.in,v 1.486 2006/11/06 03:44:37 tgl Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@ -640,9 +640,14 @@ AC_DEFINE_UNQUOTED(PG_VERSION_NUM, $PG_VERSION_NUM, [PostgreSQL version as a num
##
## Libraries
##
## Most libraries are included only if they demonstrably provide a function
## we need, but libm is an exception: always include it, because there are
## too many compilers that play cute optimization games that will break
## probes for standard functions such as pow().
##
AC_CHECK_LIB(m, main)
AC_SEARCH_LIBS(setproctitle, util)
AC_SEARCH_LIBS(pow, m)
AC_SEARCH_LIBS(dlopen, dl)
AC_SEARCH_LIBS(socket, [socket wsock32])
AC_SEARCH_LIBS(shl_load, dld)

3
src/include/pg_config.h.in
View File

@ -233,6 +233,9 @@
/* Define to 1 if you have the `ldap_r' library (-lldap_r). */
#undef HAVE_LIBLDAP_R
/* Define to 1 if you have the `m' library (-lm). */
#undef HAVE_LIBM
/* Define to 1 if you have the `pam' library (-lpam). */
#undef HAVE_LIBPAM