- add -lm to LIBS, but only when it's needed to link math functions.
Some platforms don't need anything, and others add -lm automatically.
This commit is contained in:
Bryce Denney
parent
eb8bb017a4
commit
c6674c7b67
333
bochs/configure
vendored
333
bochs/configure
vendored
@ -1,5 +1,5 @@
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#! /bin/sh
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# From configure.in Id: configure.in,v 1.176 2002/11/21 19:26:06 bdenney Exp .
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# From configure.in Id: configure.in,v 1.177 2002/11/22 06:44:43 bdenney Exp .
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# Guess values for system-dependent variables and create Makefiles.
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# Generated by GNU Autoconf 2.53.
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#
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@ -14618,6 +14618,337 @@ if test "x$wx_largefile" = "xyes"; then
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CXXFLAGS="$CXXFLAGS $BX_LARGEFILE_FLAGS"
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fi
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have_cos=0
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have_floor=0
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for ac_func in cos
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do
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as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
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echo "$as_me:$LINENO: checking for $ac_func" >&5
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echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6
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if eval "test \"\${$as_ac_var+set}\" = set"; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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/* System header to define __stub macros and hopefully few prototypes,
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which can conflict with char $ac_func (); below. */
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#include <assert.h>
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/* Override any gcc2 internal prototype to avoid an error. */
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#ifdef __cplusplus
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extern "C"
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#endif
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/* We use char because int might match the return type of a gcc2
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builtin and then its argument prototype would still apply. */
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char $ac_func ();
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char (*f) ();
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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/* The GNU C library defines this for functions which it implements
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to always fail with ENOSYS. Some functions are actually named
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something starting with __ and the normal name is an alias. */
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#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
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choke me
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#else
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f = $ac_func;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext conftest$ac_exeext
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if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
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(eval $ac_link) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest$ac_exeext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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eval "$as_ac_var=yes"
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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eval "$as_ac_var=no"
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fi
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rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
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fi
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echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_var'}'`" >&5
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echo "${ECHO_T}`eval echo '${'$as_ac_var'}'`" >&6
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if test `eval echo '${'$as_ac_var'}'` = yes; then
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cat >>confdefs.h <<_ACEOF
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#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
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_ACEOF
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have_cos=1
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fi
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done
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for ac_func in floor
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do
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as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
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echo "$as_me:$LINENO: checking for $ac_func" >&5
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echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6
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if eval "test \"\${$as_ac_var+set}\" = set"; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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/* System header to define __stub macros and hopefully few prototypes,
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which can conflict with char $ac_func (); below. */
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#include <assert.h>
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/* Override any gcc2 internal prototype to avoid an error. */
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#ifdef __cplusplus
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extern "C"
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#endif
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/* We use char because int might match the return type of a gcc2
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builtin and then its argument prototype would still apply. */
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char $ac_func ();
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char (*f) ();
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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/* The GNU C library defines this for functions which it implements
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to always fail with ENOSYS. Some functions are actually named
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something starting with __ and the normal name is an alias. */
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#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
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choke me
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#else
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f = $ac_func;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext conftest$ac_exeext
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if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
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(eval $ac_link) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest$ac_exeext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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eval "$as_ac_var=yes"
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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eval "$as_ac_var=no"
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fi
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rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
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fi
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echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_var'}'`" >&5
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echo "${ECHO_T}`eval echo '${'$as_ac_var'}'`" >&6
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if test `eval echo '${'$as_ac_var'}'` = yes; then
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cat >>confdefs.h <<_ACEOF
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#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
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_ACEOF
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have_floor=1
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fi
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done
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echo "$as_me:$LINENO: checking if math functions link without -lm" >&5
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echo $ECHO_N "checking if math functions link without -lm... $ECHO_C" >&6
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if test "$have_cos" = 1 -a "$have_floor" = 1; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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LIBS="$LIBS -lm"
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# use different functions to bypass configure caching
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have_sin=0
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have_ceil=0
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for ac_func in sin
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do
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as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
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echo "$as_me:$LINENO: checking for $ac_func" >&5
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echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6
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if eval "test \"\${$as_ac_var+set}\" = set"; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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/* System header to define __stub macros and hopefully few prototypes,
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which can conflict with char $ac_func (); below. */
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#include <assert.h>
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/* Override any gcc2 internal prototype to avoid an error. */
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#ifdef __cplusplus
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extern "C"
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#endif
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/* We use char because int might match the return type of a gcc2
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builtin and then its argument prototype would still apply. */
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char $ac_func ();
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char (*f) ();
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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/* The GNU C library defines this for functions which it implements
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to always fail with ENOSYS. Some functions are actually named
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something starting with __ and the normal name is an alias. */
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#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
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choke me
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#else
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f = $ac_func;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext conftest$ac_exeext
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if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
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(eval $ac_link) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest$ac_exeext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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eval "$as_ac_var=yes"
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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eval "$as_ac_var=no"
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fi
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rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
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fi
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echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_var'}'`" >&5
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echo "${ECHO_T}`eval echo '${'$as_ac_var'}'`" >&6
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if test `eval echo '${'$as_ac_var'}'` = yes; then
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cat >>confdefs.h <<_ACEOF
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#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
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_ACEOF
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have_sin=1
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fi
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done
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for ac_func in ceil
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do
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as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
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echo "$as_me:$LINENO: checking for $ac_func" >&5
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echo $ECHO_N "checking for $ac_func... $ECHO_C" >&6
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if eval "test \"\${$as_ac_var+set}\" = set"; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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cat >conftest.$ac_ext <<_ACEOF
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#line $LINENO "configure"
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#include "confdefs.h"
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/* System header to define __stub macros and hopefully few prototypes,
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which can conflict with char $ac_func (); below. */
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#include <assert.h>
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/* Override any gcc2 internal prototype to avoid an error. */
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#ifdef __cplusplus
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extern "C"
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#endif
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/* We use char because int might match the return type of a gcc2
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builtin and then its argument prototype would still apply. */
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char $ac_func ();
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char (*f) ();
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#ifdef F77_DUMMY_MAIN
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# ifdef __cplusplus
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extern "C"
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# endif
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int F77_DUMMY_MAIN() { return 1; }
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#endif
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int
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main ()
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{
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/* The GNU C library defines this for functions which it implements
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to always fail with ENOSYS. Some functions are actually named
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something starting with __ and the normal name is an alias. */
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#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
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choke me
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#else
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f = $ac_func;
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#endif
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;
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return 0;
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}
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_ACEOF
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rm -f conftest.$ac_objext conftest$ac_exeext
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if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
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(eval $ac_link) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); } &&
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{ ac_try='test -s conftest$ac_exeext'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }; then
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eval "$as_ac_var=yes"
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else
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echo "$as_me: failed program was:" >&5
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cat conftest.$ac_ext >&5
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eval "$as_ac_var=no"
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fi
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rm -f conftest.$ac_objext conftest$ac_exeext conftest.$ac_ext
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fi
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echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_var'}'`" >&5
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echo "${ECHO_T}`eval echo '${'$as_ac_var'}'`" >&6
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if test `eval echo '${'$as_ac_var'}'` = yes; then
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cat >>confdefs.h <<_ACEOF
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#define `echo "HAVE_$ac_func" | $as_tr_cpp` 1
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_ACEOF
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have_ceil=1
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fi
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done
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echo "$as_me:$LINENO: checking if math functions link with -lm" >&5
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echo $ECHO_N "checking if math functions link with -lm... $ECHO_C" >&6
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if test "$have_sin" = 1 -a "$have_ceil" = 1; then
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echo "$as_me:$LINENO: result: yes" >&5
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echo "${ECHO_T}yes" >&6
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else
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echo "$as_me:$LINENO: result: no" >&5
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echo "${ECHO_T}no" >&6
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# not sure we should warn the user, crash, etc.
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# expect link failure
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fi
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fi
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echo "$as_me:$LINENO: checking for struct timeval" >&5
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echo $ECHO_N "checking for struct timeval... $ECHO_C" >&6
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cat >conftest.$ac_ext <<_ACEOF
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@ -2,7 +2,7 @@ dnl // Process this file with autoconf to produce a configure script.
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AC_PREREQ(2.50)
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AC_INIT(bochs.h)
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AC_REVISION([[$Id: configure.in,v 1.177 2002-11-22 06:44:43 bdenney Exp $]])
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AC_REVISION([[$Id: configure.in,v 1.178 2002-11-23 00:29:43 bdenney Exp $]])
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AC_CONFIG_HEADER(config.h)
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AC_CONFIG_HEADER(ltdlconf.h)
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fi
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dnl ---end of largefile tests
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dnl Add the -lm library if math functions cannot be used without it.
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dnl This check is important on cygwin because of the bizarre way that they
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dnl have organized functions into libraries. On cygwin, both libc.a and
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dnl libm.a are symbolic links to a single lib libcygwin.a. This means that
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dnl 1) linking with -lm is not necessary, and
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dnl 2) linking with -lm is dangerous if the order of libraries is wrong
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dnl In particular, if you compile any program with -mno-cygwin and link with
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dnl -lm, it will crash instantly when it is run. This happens because the
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dnl linker incorrectly links the Cygwin libm.a (==libcygwin.a), which replaces
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dnl the ___main function instead of allowing it to be defined by
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dnl /usr/lib/mingw/libmingw32.a as it should be.
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dnl
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dnl On MacOS X, this test will find that -lm is unnecessary and leave it out.
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dnl
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dnl Just check a few math functions. If they are all found without
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dnl -lm, then we must not need -lm.
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have_cos=0
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have_floor=0
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AC_CHECK_FUNCS(cos, have_cos=1)
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AC_CHECK_FUNCS(floor, have_floor=1)
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AC_MSG_CHECKING(if math functions link without -lm)
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if test "$have_cos" = 1 -a "$have_floor" = 1; then
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AC_MSG_RESULT(yes)
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else
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AC_MSG_RESULT(no)
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LIBS="$LIBS -lm"
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# use different functions to bypass configure caching
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have_sin=0
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have_ceil=0
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AC_CHECK_FUNCS(sin, have_sin=1)
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AC_CHECK_FUNCS(ceil, have_ceil=1)
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AC_MSG_CHECKING(if math functions link with -lm)
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if test "$have_sin" = 1 -a "$have_ceil" = 1; then
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AC_MSG_RESULT(yes)
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else
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AC_MSG_RESULT(no)
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# not sure we should warn the user, crash, etc.
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# expect link failure
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fi
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fi
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AC_MSG_CHECKING(for struct timeval)
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AC_TRY_COMPILE([#include <sys/time.h>],
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[struct timeval x;],
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Loading…
Reference in New Issue
Block a user