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Commit02f37bd

Browse files
committed
Revert to the pre-8.2 method of probing for libm, that is, always
include it if it links properly. It seems too risky to assume thatstandard functions like pow() are not special-cased by the compiler.Per report from Andreas Lange that build fails on Solaris cc compilerwith -fast. Even though we don't consider that a supported option,I'm worried that similar issues will arise with other compilers.
1 parent74686b6 commit02f37bd

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3 files changed

+49
-94
lines changed

3 files changed

+49
-94
lines changed

‎configure

Lines changed: 39 additions & 92 deletions
Original file line numberDiff line numberDiff line change
@@ -5038,87 +5038,32 @@ _ACEOF
50385038
##
50395039
## Libraries
50405040
##
5041+
## Most libraries are included only if they demonstrably provide a function
5042+
## we need, but libm is an exception: always include it, because there are
5043+
## too many compilers that play cute optimization games that will break
5044+
## probes for standard functions such as pow().
5045+
##
50415046

5042-
echo "$as_me:$LINENO: checking for library containing setproctitle" >&5
5043-
echo $ECHO_N "checking for library containing setproctitle... $ECHO_C" >&6
5044-
if test "${ac_cv_search_setproctitle+set}" = set; then
5047+
5048+
echo "$as_me:$LINENO: checking for main in -lm" >&5
5049+
echo $ECHO_N "checking for main in -lm... $ECHO_C" >&6
5050+
if test "${ac_cv_lib_m_main+set}" = set; then
50455051
echo $ECHO_N "(cached) $ECHO_C" >&6
50465052
else
5047-
ac_func_search_save_LIBS=$LIBS
5048-
ac_cv_search_setproctitle=no
5053+
ac_check_lib_save_LIBS=$LIBS
5054+
LIBS="-lm $LIBS"
50495055
cat >conftest.$ac_ext <<_ACEOF
50505056
/* confdefs.h. */
50515057
_ACEOF
50525058
cat confdefs.h >>conftest.$ac_ext
50535059
cat >>conftest.$ac_ext <<_ACEOF
50545060
/* end confdefs.h. */
50555061

5056-
/* Override any gcc2 internal prototype to avoid an error. */
5057-
#ifdef __cplusplus
5058-
extern "C"
5059-
#endif
5060-
/* We use char because int might match the return type of a gcc2
5061-
builtin and then its argument prototype would still apply. */
5062-
char setproctitle ();
5063-
int
5064-
main ()
5065-
{
5066-
setproctitle ();
5067-
;
5068-
return 0;
5069-
}
5070-
_ACEOF
5071-
rm -f conftest.$ac_objext conftest$ac_exeext
5072-
if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
5073-
(eval $ac_link) 2>conftest.er1
5074-
ac_status=$?
5075-
grep -v '^ *+' conftest.er1 >conftest.err
5076-
rm -f conftest.er1
5077-
cat conftest.err >&5
5078-
echo "$as_me:$LINENO: \$? = $ac_status" >&5
5079-
(exit $ac_status); } &&
5080-
{ ac_try='test -z "$ac_c_werror_flag"
5081-
|| test ! -s conftest.err'
5082-
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
5083-
(eval $ac_try) 2>&5
5084-
ac_status=$?
5085-
echo "$as_me:$LINENO: \$? = $ac_status" >&5
5086-
(exit $ac_status); }; } &&
5087-
{ ac_try='test -s conftest$ac_exeext'
5088-
{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
5089-
(eval $ac_try) 2>&5
5090-
ac_status=$?
5091-
echo "$as_me:$LINENO: \$? = $ac_status" >&5
5092-
(exit $ac_status); }; }; then
5093-
ac_cv_search_setproctitle="none required"
5094-
else
5095-
echo "$as_me: failed program was:" >&5
5096-
sed 's/^/| /' conftest.$ac_ext >&5
50975062

5098-
fi
5099-
rm -f conftest.err conftest.$ac_objext \
5100-
conftest$ac_exeext conftest.$ac_ext
5101-
if test "$ac_cv_search_setproctitle" = no; then
5102-
for ac_lib in util; do
5103-
LIBS="-l$ac_lib $ac_func_search_save_LIBS"
5104-
cat >conftest.$ac_ext <<_ACEOF
5105-
/* confdefs.h. */
5106-
_ACEOF
5107-
cat confdefs.h >>conftest.$ac_ext
5108-
cat >>conftest.$ac_ext <<_ACEOF
5109-
/* end confdefs.h. */
5110-
5111-
/* Override any gcc2 internal prototype to avoid an error. */
5112-
#ifdef __cplusplus
5113-
extern "C"
5114-
#endif
5115-
/* We use char because int might match the return type of a gcc2
5116-
builtin and then its argument prototype would still apply. */
5117-
char setproctitle ();
51185063
int
51195064
main ()
51205065
{
5121-
setproctitle ();
5066+
main ();
51225067
;
51235068
return 0;
51245069
}
@@ -5145,33 +5090,35 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
51455090
ac_status=$?
51465091
echo "$as_me:$LINENO: \$? = $ac_status" >&5
51475092
(exit $ac_status); }; }; then
5148-
ac_cv_search_setproctitle="-l$ac_lib"
5149-
break
5093+
ac_cv_lib_m_main=yes
51505094
else
51515095
echo "$as_me: failed program was:" >&5
51525096
sed 's/^/| /' conftest.$ac_ext >&5
51535097

5098+
ac_cv_lib_m_main=no
51545099
fi
51555100
rm -f conftest.err conftest.$ac_objext \
51565101
conftest$ac_exeext conftest.$ac_ext
5157-
done
5158-
fi
5159-
LIBS=$ac_func_search_save_LIBS
5102+
LIBS=$ac_check_lib_save_LIBS
51605103
fi
5161-
echo "$as_me:$LINENO: result: $ac_cv_search_setproctitle" >&5
5162-
echo "${ECHO_T}$ac_cv_search_setproctitle" >&6
5163-
if test "$ac_cv_search_setproctitle" != no; then
5164-
test "$ac_cv_search_setproctitle" = "none required" || LIBS="$ac_cv_search_setproctitle $LIBS"
5104+
echo "$as_me:$LINENO: result: $ac_cv_lib_m_main" >&5
5105+
echo "${ECHO_T}$ac_cv_lib_m_main" >&6
5106+
if test $ac_cv_lib_m_main = yes; then
5107+
cat >>confdefs.h <<_ACEOF
5108+
#define HAVE_LIBM 1
5109+
_ACEOF
5110+
5111+
LIBS="-lm $LIBS"
51655112

51665113
fi
51675114

5168-
echo "$as_me:$LINENO: checking for library containingpow" >&5
5169-
echo $ECHO_N "checking for library containingpow... $ECHO_C" >&6
5170-
if test "${ac_cv_search_pow+set}" = set; then
5115+
echo "$as_me:$LINENO: checking for library containingsetproctitle" >&5
5116+
echo $ECHO_N "checking for library containingsetproctitle... $ECHO_C" >&6
5117+
if test "${ac_cv_search_setproctitle+set}" = set; then
51715118
echo $ECHO_N "(cached) $ECHO_C" >&6
51725119
else
51735120
ac_func_search_save_LIBS=$LIBS
5174-
ac_cv_search_pow=no
5121+
ac_cv_search_setproctitle=no
51755122
cat >conftest.$ac_ext <<_ACEOF
51765123
/* confdefs.h. */
51775124
_ACEOF
@@ -5185,11 +5132,11 @@ extern "C"
51855132
#endif
51865133
/* We use char because int might match the return type of a gcc2
51875134
builtin and then its argument prototype would still apply. */
5188-
charpow ();
5135+
charsetproctitle ();
51895136
int
51905137
main ()
51915138
{
5192-
pow ();
5139+
setproctitle ();
51935140
;
51945141
return 0;
51955142
}
@@ -5216,16 +5163,16 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
52165163
ac_status=$?
52175164
echo "$as_me:$LINENO: \$? = $ac_status" >&5
52185165
(exit $ac_status); }; }; then
5219-
ac_cv_search_pow="none required"
5166+
ac_cv_search_setproctitle="none required"
52205167
else
52215168
echo "$as_me: failed program was:" >&5
52225169
sed 's/^/| /' conftest.$ac_ext >&5
52235170

52245171
fi
52255172
rm -f conftest.err conftest.$ac_objext \
52265173
conftest$ac_exeext conftest.$ac_ext
5227-
if test "$ac_cv_search_pow" = no; then
5228-
for ac_lib inm; do
5174+
if test "$ac_cv_search_setproctitle" = no; then
5175+
for ac_lib inutil; do
52295176
LIBS="-l$ac_lib $ac_func_search_save_LIBS"
52305177
cat >conftest.$ac_ext <<_ACEOF
52315178
/* confdefs.h. */
@@ -5240,11 +5187,11 @@ extern "C"
52405187
#endif
52415188
/* We use char because int might match the return type of a gcc2
52425189
builtin and then its argument prototype would still apply. */
5243-
charpow ();
5190+
charsetproctitle ();
52445191
int
52455192
main ()
52465193
{
5247-
pow ();
5194+
setproctitle ();
52485195
;
52495196
return 0;
52505197
}
@@ -5271,7 +5218,7 @@ if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
52715218
ac_status=$?
52725219
echo "$as_me:$LINENO: \$? = $ac_status" >&5
52735220
(exit $ac_status); }; }; then
5274-
ac_cv_search_pow="-l$ac_lib"
5221+
ac_cv_search_setproctitle="-l$ac_lib"
52755222
break
52765223
else
52775224
echo "$as_me: failed program was:" >&5
@@ -5284,10 +5231,10 @@ rm -f conftest.err conftest.$ac_objext \
52845231
fi
52855232
LIBS=$ac_func_search_save_LIBS
52865233
fi
5287-
echo "$as_me:$LINENO: result: $ac_cv_search_pow" >&5
5288-
echo "${ECHO_T}$ac_cv_search_pow" >&6
5289-
if test "$ac_cv_search_pow" != no; then
5290-
test "$ac_cv_search_pow" = "none required" || LIBS="$ac_cv_search_pow $LIBS"
5234+
echo "$as_me:$LINENO: result: $ac_cv_search_setproctitle" >&5
5235+
echo "${ECHO_T}$ac_cv_search_setproctitle" >&6
5236+
if test "$ac_cv_search_setproctitle" != no; then
5237+
test "$ac_cv_search_setproctitle" = "none required" || LIBS="$ac_cv_search_setproctitle $LIBS"
52915238

52925239
fi
52935240

‎configure.in

Lines changed: 7 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $PostgreSQL: pgsql/configure.in,v 1.485 2006/10/30 22:15:04 petere Exp $
2+
dnl $PostgreSQL: pgsql/configure.in,v 1.486 2006/11/06 03:44:37 tgl Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -640,9 +640,14 @@ AC_DEFINE_UNQUOTED(PG_VERSION_NUM, $PG_VERSION_NUM, [PostgreSQL version as a num
640640
##
641641
## Libraries
642642
##
643+
## Most libraries are included only if they demonstrably provide a function
644+
## we need, but libm is an exception: always include it, because there are
645+
## too many compilers that play cute optimization games that will break
646+
## probes for standard functions such as pow().
647+
##
643648

649+
AC_CHECK_LIB(m, main)
644650
AC_SEARCH_LIBS(setproctitle, util)
645-
AC_SEARCH_LIBS(pow, m)
646651
AC_SEARCH_LIBS(dlopen, dl)
647652
AC_SEARCH_LIBS(socket, [socket wsock32])
648653
AC_SEARCH_LIBS(shl_load, dld)

‎src/include/pg_config.h.in

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -233,6 +233,9 @@
233233
/* Define to 1 if you have the `ldap_r' library (-lldap_r). */
234234
#undef HAVE_LIBLDAP_R
235235

236+
/* Define to 1 if you have the `m' library (-lm). */
237+
#undef HAVE_LIBM
238+
236239
/* Define to 1 if you have the `pam' library (-lpam). */
237240
#undef HAVE_LIBPAM
238241

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