Lines Matching refs:ac_ext

1772 # Try to compile conftest.$ac_ext, and return whether this succeeded.
1799 sed 's/^/| /' conftest.$ac_ext >&5
1810 # Try to preprocess conftest.$ac_ext, and return whether this succeeded.
1814 if { { ac_try="$ac_cpp conftest.$ac_ext"
1821 (eval "$ac_cpp conftest.$ac_ext") 2>conftest.err
1836 sed 's/^/| /' conftest.$ac_ext >&5
1866 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
1876 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
1883 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
1892 rm -f conftest.err conftest.i conftest.$ac_ext
1938 # Try to link conftest.$ac_ext, and return whether this succeeded. Assumes
1968 sed 's/^/| /' conftest.$ac_ext >&5
1990 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2000 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2011 # Try to link conftest.$ac_ext, and return whether this succeeded.
2041 sed 's/^/| /' conftest.$ac_ext >&5
2066 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2113 conftest$ac_exeext conftest.$ac_ext
2135 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2148 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2165 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2167 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2186 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2203 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2227 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2230 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2247 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2271 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2276 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2278 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2282 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2301 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2308 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2350 conftest.$ac_objext conftest.beam conftest.$ac_ext
2373 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2396 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2417 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2433 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
2451 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2453 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
2806 ac_ext=c
2808 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
2809 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
2933 ac_ext=c
2935 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
2936 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
3261 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3288 *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
3314 *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj )
3344 sed 's/^/| /' conftest.$ac_ext >&5
3382 *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM | *.o | *.obj ) ;;
3398 rm -f conftest.$ac_ext
3401 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3458 rm -f conftest.$ac_ext conftest$ac_cv_exeext conftest.out
3465 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3491 *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.map | *.inf | *.dSYM ) ;;
3498 sed 's/^/| /' conftest.$ac_ext >&5
3505 rm -f conftest.$ac_cv_objext conftest.$ac_ext
3516 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3535 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
3557 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3572 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3588 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3602 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
3604 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
3606 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
3633 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3695 rm -f conftest.$ac_ext
3716 ac_ext=c
3718 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
3719 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
3723 ac_ext=c
3725 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
3726 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
3750 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3765 rm -f conftest.err conftest.i conftest.$ac_ext
3769 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3781 rm -f conftest.err conftest.i conftest.$ac_ext
3785 rm -f conftest.i conftest.err conftest.$ac_ext
3809 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3824 rm -f conftest.err conftest.i conftest.$ac_ext
3828 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
3840 rm -f conftest.err conftest.i conftest.$ac_ext
3844 rm -f conftest.i conftest.err conftest.$ac_ext
3854 ac_ext=c
3856 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
3857 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
3996 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4016 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4020 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4025 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
4037 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4042 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
4057 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4090 conftest.$ac_objext conftest.beam conftest.$ac_ext
4147 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4165 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4416 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4482 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4492 ac_ext=c
4494 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
4495 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
4565 ac_ext=c
4567 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
4568 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
4898 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4917 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4939 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4954 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4970 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
4984 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4986 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
4988 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
5015 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
5077 rm -f conftest.$ac_ext
5098 ac_ext=c
5100 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
5101 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
6033 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6061 conftest$ac_exeext conftest.$ac_ext
6079 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6107 conftest$ac_exeext conftest.$ac_ext
6123 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6151 conftest$ac_exeext conftest.$ac_ext
6164 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6176 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
6206 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6227 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
6247 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6267 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
6291 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6311 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
6336 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6356 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
6485 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6493 conftest$ac_exeext conftest.$ac_ext
6516 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
6526 conftest$ac_exeext conftest.$ac_ext
7530 echo "int some_variable = 0;" > conftest.$ac_ext
8454 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
8488 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
8959 cat > conftest.$ac_ext <<_LT_EOF
8994 cat <<_LT_EOF > conftest.$ac_ext
9013 eval "$lt_cv_sys_global_symbol_to_cdecl"' < "$nlist" | $GREP -v main >> conftest.$ac_ext'
9015 cat <<_LT_EOF >> conftest.$ac_ext
9026 $SED "s/^$symcode$symcode* .* \(.*\)$/ {\"\1\", (void *) \&\1},/" < "$nlist" | $GREP -v main >> conftest.$ac_ext
9027 cat <<\_LT_EOF >> conftest.$ac_ext
9068 cat conftest.$ac_ext >&5
9266 echo 'int i;' > conftest.$ac_ext
9286 echo '#line '$LINENO' "configure"' > conftest.$ac_ext
9324 echo '#line '$LINENO' "configure"' > conftest.$ac_ext
9365 echo 'int i;' > conftest.$ac_ext
9437 ac_ext=c
9439 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
9440 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
9443 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
9460 conftest$ac_exeext conftest.$ac_ext
9461 ac_ext=c
9463 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
9464 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
9478 echo 'int i;' > conftest.$ac_ext
10167 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
10184 conftest$ac_exeext conftest.$ac_ext
10765 ac_ext=c
10767 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
10768 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
10773 ac_ext=c
10806 echo "$lt_simple_compile_test_code" >conftest.$ac_ext
10812 echo "$lt_simple_link_test_code" >conftest.$ac_ext
10837 echo "$lt_simple_compile_test_code" > conftest.$ac_ext
11245 echo "$lt_simple_compile_test_code" > conftest.$ac_ext
11310 echo "$lt_simple_link_test_code" > conftest.$ac_ext
11355 echo "$lt_simple_compile_test_code" > conftest.$ac_ext
11410 echo "$lt_simple_compile_test_code" > conftest.$ac_ext
12039 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
12066 conftest$ac_exeext conftest.$ac_ext
12092 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
12119 conftest$ac_exeext conftest.$ac_ext
12377 echo "$lt_simple_link_test_code" > conftest.$ac_ext
12445 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
12455 conftest$ac_exeext conftest.$ac_ext
12782 echo "$lt_simple_compile_test_code" > conftest.$ac_ext
13549 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
13566 conftest$ac_exeext conftest.$ac_ext
13999 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14023 conftest$ac_exeext conftest.$ac_ext
14060 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14084 conftest$ac_exeext conftest.$ac_ext
14103 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14127 conftest$ac_exeext conftest.$ac_ext
14142 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14166 conftest$ac_exeext conftest.$ac_ext
14181 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14205 conftest$ac_exeext conftest.$ac_ext
14259 cat > conftest.$ac_ext <<_LT_EOF
14365 cat > conftest.$ac_ext <<_LT_EOF
14579 ac_ext=c
14581 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
14582 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
14907 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
14912 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
15055 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15088 conftest.$ac_objext conftest.beam conftest.$ac_ext
15195 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15234 rm conftest.$ac_ext
15251 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15290 rm conftest.$ac_ext
15325 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15356 conftest.$ac_objext conftest.beam conftest.$ac_ext
15403 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15423 conftest.$ac_objext conftest.beam conftest.$ac_ext
15456 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15554 conftest.$ac_objext conftest.beam conftest.$ac_ext
15592 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15609 conftest$ac_exeext conftest.$ac_ext
15610 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15628 conftest$ac_exeext conftest.$ac_ext
15673 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15704 rm -f conftest.$ac_ext
15719 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15741 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
15742 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15765 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
15788 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15810 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
15811 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
15834 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
15934 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16075 conftest.$ac_objext conftest.beam conftest.$ac_ext
16083 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16117 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
16136 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16154 conftest.$ac_objext conftest.beam conftest.$ac_ext
16443 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16482 conftest.$ac_objext conftest.beam conftest.$ac_ext
16507 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16536 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
16557 ac_ext=c
16559 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
16560 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
16579 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16601 conftest$ac_exeext conftest.$ac_ext
16672 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16691 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
16774 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16796 conftest$ac_exeext conftest.$ac_ext
16824 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16839 conftest$ac_exeext conftest.$ac_ext
16878 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
16895 conftest$ac_exeext conftest.$ac_ext
17018 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17056 ac_ext=c
17058 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
17059 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
17086 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17125 rm conftest.$ac_ext
17232 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17271 rm conftest.$ac_ext
17453 ac_ext=c
17455 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
17456 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
17465 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
17486 conftest$ac_exeext conftest.$ac_ext
17505 ac_ext=c
17507 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
17508 ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
18011 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18044 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18076 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18108 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18138 conftest$ac_exeext conftest.$ac_ext
18142 conftest$ac_exeext conftest.$ac_ext
18146 conftest$ac_exeext conftest.$ac_ext
18150 conftest$ac_exeext conftest.$ac_ext
18202 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18237 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18276 rm conftest.$ac_ext
18290 conftest$ac_exeext conftest.$ac_ext
18301 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18330 conftest$ac_exeext conftest.$ac_ext
18527 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18576 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
18610 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18649 rm conftest.$ac_ext
18764 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
18855 conftest.$ac_objext conftest.beam conftest.$ac_ext
19315 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
19354 rm conftest.$ac_ext
19392 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
19431 rm conftest.$ac_ext
19451 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
19490 rm conftest.$ac_ext
19854 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
19889 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
19922 conftest$ac_exeext conftest.$ac_ext
19926 conftest$ac_exeext conftest.$ac_ext
20078 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20108 conftest$ac_exeext conftest.$ac_ext
20228 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20258 conftest$ac_exeext conftest.$ac_ext
20262 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20292 conftest$ac_exeext conftest.$ac_ext
20300 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20339 rm conftest.$ac_ext
20547 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20573 conftest.$ac_objext conftest.beam conftest.$ac_ext
20666 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20701 conftest$ac_exeext conftest.$ac_ext
20829 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20868 rm conftest.$ac_ext
20948 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
20987 rm conftest.$ac_ext
21171 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
21210 rm conftest.$ac_ext
21282 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
21321 rm conftest.$ac_ext
21340 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
21379 rm conftest.$ac_ext
21407 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
21446 rm conftest.$ac_ext