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Make another try at using -Wl,--as-needed to suppress linking of unnecessary

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shared libraries.  We've tried this before and had problems with libreadline
not linking properly on some platforms, but that seems to be a libreadline
bug that may have been fixed by now.  In any case, it's early enough in the
8.4 devel cycle that we can afford to have some transient breakage while
we work out any portability problems.

On Darwin, we try -Wl,-dead_strip_dylibs, which seems to be the equivalent
incantation there.
This commit is contained in:
Tom Lane 2008-05-18 20:13:12 +00:00
parent 07d08a8828
commit 2dad10f467
3 changed files with 138 additions and 2 deletions

18
config/c-compiler.m4

@ -1,5 +1,5 @@
# Macros to detect C compiler features
# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.16 2008/04/18 18:43:08 alvherre Exp $
# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.17 2008/05/18 20:13:12 tgl Exp $
# PGAC_C_SIGNED
@ -110,3 +110,19 @@ _AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
[CFLAGS="$pgac_save_CFLAGS"
AC_MSG_RESULT(no)])
])# PGAC_PROG_CC_CFLAGS_OPT
# PGAC_PROG_CC_LDFLAGS_OPT
# ------------------------
# Given a string, check if the compiler supports the string as a
# command-line option. If it does, add the string to LDFLAGS.
AC_DEFUN([PGAC_PROG_CC_LDFLAGS_OPT],
[AC_MSG_CHECKING([if $CC supports $1])
pgac_save_LDFLAGS=$LDFLAGS
LDFLAGS="$pgac_save_LDFLAGS $1"
AC_LINK_IFELSE([AC_LANG_PROGRAM()],
AC_MSG_RESULT(yes),
[LDFLAGS="$pgac_save_LDFLAGS"
AC_MSG_RESULT(no)])
])# PGAC_PROG_CC_LDFLAGS_OPT

110
configure vendored

@ -4318,6 +4318,116 @@ ac_compiler_gnu=$ac_cv_c_compiler_gnu
# If compiler will take -Wl,--as-needed then add that to LDFLAGS.
# This is much easier than trying to filter LIBS to the minimum for each
# executable. (Note that shared libraries won't use this switch, though.)
# On Darwin it's spelled -Wl,-dead_strip_dylibs, but don't try that elsewhere
if test "$PORTNAME" != "darwin"; then
{ echo "$as_me:$LINENO: checking if $CC supports -Wl,--as-needed" >&5
echo $ECHO_N "checking if $CC supports -Wl,--as-needed... $ECHO_C" >&6; }
pgac_save_LDFLAGS=$LDFLAGS
LDFLAGS="$pgac_save_LDFLAGS -Wl,--as-needed"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$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 $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
LDFLAGS="$pgac_save_LDFLAGS"
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
else
{ echo "$as_me:$LINENO: checking if $CC supports -Wl,-dead_strip_dylibs" >&5
echo $ECHO_N "checking if $CC supports -Wl,-dead_strip_dylibs... $ECHO_C" >&6; }
pgac_save_LDFLAGS=$LDFLAGS
LDFLAGS="$pgac_save_LDFLAGS -Wl,-dead_strip_dylibs"
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h. */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
*\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
*) ac_try_echo=$ac_try;;
esac
eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
(eval "$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 $ac_status); } && {
test -z "$ac_c_werror_flag" ||
test ! -s conftest.err
} && test -s conftest$ac_exeext &&
$as_test_x conftest$ac_exeext; then
{ echo "$as_me:$LINENO: result: yes" >&5
echo "${ECHO_T}yes" >&6; }
else
echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5
LDFLAGS="$pgac_save_LDFLAGS"
{ echo "$as_me:$LINENO: result: no" >&5
echo "${ECHO_T}no" >&6; }
fi
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
conftest$ac_exeext conftest.$ac_ext
fi
# Create compiler version string
if test x"$GCC" = x"yes" ; then
cc_string="GCC `${CC} --version | sed q`"

12
configure.in

@ -1,5 +1,5 @@
dnl Process this file with autoconf to produce a configure script.
dnl $PostgreSQL: pgsql/configure.in,v 1.560 2008/05/03 00:24:05 adunstan Exp $
dnl $PostgreSQL: pgsql/configure.in,v 1.561 2008/05/18 20:13:12 tgl Exp $
dnl
dnl Developers, please strive to achieve this order:
dnl
@ -450,6 +450,16 @@ fi
AC_PROG_CPP
AC_SUBST(GCC)
# If compiler will take -Wl,--as-needed then add that to LDFLAGS.
# This is much easier than trying to filter LIBS to the minimum for each
# executable. (Note that shared libraries won't use this switch, though.)
# On Darwin it's spelled -Wl,-dead_strip_dylibs, but don't try that elsewhere
if test "$PORTNAME" != "darwin"; then
PGAC_PROG_CC_LDFLAGS_OPT([-Wl,--as-needed])
else
PGAC_PROG_CC_LDFLAGS_OPT([-Wl,-dead_strip_dylibs])
fi
# Create compiler version string
if test x"$GCC" = x"yes" ; then
cc_string="GCC `${CC} --version | sed q`"