X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=ltcf-gcj.sh;h=950dd00317735e6e7a1f7544d798fe4220971834;hp=dd46e0cd73b936e64cb95086da86a7fa87a5983a;hb=1d5cf8dc28d2a6b2ea22dbe8eb66db1b4f93c584;hpb=d76e21baeefa4eb33d5623084fb8a1b94449509d

diff --git a/ltcf-gcj.sh b/ltcf-gcj.sh
index dd46e0cd73b..950dd003177 100644
--- a/ltcf-gcj.sh
+++ b/ltcf-gcj.sh
@@ -2,7 +2,7 @@
 
 # ltcf-gcj.sh - Create a GCJ compiler specific configuration
 #
-# Copyright (C) 1996-1999,2000 Free Software Foundation, Inc.
+# Copyright (C) 1996-1999, 2000, 2001, 2003 Free Software Foundation, Inc.
 # Originally by Gordon Matzigkeit <gord@gnu.ai.mit.edu>, 1996
 #
 # Original GCJ support by:
@@ -38,10 +38,10 @@ objext=o
 lt_simple_compile_test_code="class foo {}"
 
 # Code to be used in simple link tests
-lt_simple_link_test_code='public class conftest { public static void main(String[] argv) {} (0); }'
+lt_simple_link_test_code='public class conftest { public static void main(String[] argv) {}; }'
 
 ## Linker Characteristics
-case "$host_os" in
+case $host_os in
 cygwin* | mingw*)
   # FIXME: the MSVC++ port hasn't been tested in a loooong time
   # When not using gcc, we currently assume that we are using
@@ -59,11 +59,12 @@ if test "$with_gnu_ld" = yes; then
   wlarc='${wl}'
 
   # See if GNU ld supports shared libraries.
-  case "$host_os" in
-  aix3* | aix4*)
-    # On AIX, the GNU linker is very broken
-    ld_shlibs=no
-    cat <<EOF 1>&2
+  case $host_os in
+  aix3* | aix4* | aix5*)
+    # On AIX/PPC, the GNU linker is very broken
+    if test "$host_cpu" != ia64; then
+      ld_shlibs=no
+      cat <<EOF 1>&2
 
 *** Warning: the GNU linker, at least up to release 2.9.1, is reported
 *** to be unable to reliably create shared libraries on AIX.
@@ -72,6 +73,7 @@ if test "$with_gnu_ld" = yes; then
 *** so that a non-GNU linker is found, and then restart.
 
 EOF
+    fi
     ;;
 
   amigaos*)
@@ -109,9 +111,9 @@ EOF
     extract_expsyms_cmds='test -f $output_objdir/impgen.c || \
       sed -e "/^# \/\* impgen\.c starts here \*\//,/^# \/\* impgen.c ends here \*\// { s/^# //; p; }" -e d < $0 > $output_objdir/impgen.c~
       test -f $output_objdir/impgen.exe || (cd $output_objdir && \
-      if test "x$HOST_CC" != "x" ; then $HOST_CC -o impgen impgen.c ; \
+      if test "x$BUILD_CC" != "x" ; then $BUILD_CC -o impgen impgen.c ; \
       else $CC -o impgen impgen.c ; fi)~
-      $output_objdir/impgen $dir/$soname > $output_objdir/$soname-def'
+      $output_objdir/impgen $dir/$soroot > $output_objdir/$soname-def'
 
     old_archive_from_expsyms_cmds='$DLLTOOL --as=$AS --dllname $soname --def $output_objdir/$soname-def --output-lib $output_objdir/$newlib'
 
@@ -120,7 +122,7 @@ EOF
     # FIXME: what about values for MSVC?
     dll_entry=__cygwin_dll_entry@12
     dll_exclude_symbols=DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12~
-    case "$host_os" in
+    case $host_os in
     mingw*)
       # mingw values
       dll_entry=_DllMainCRTStartup@12
@@ -151,32 +153,38 @@ EOF
       $DLLTOOL --export-all --exclude-symbols '$dll_exclude_symbols' --output-def $output_objdir/$soname-def '$ltdll_obj'$libobjs $convenience~
       sed -e "1,/EXPORTS/d" -e "s/ @ [0-9]*//" -e "s/ *;.*$//" < $output_objdir/$soname-def > $export_symbols'
 
+    # If the export-symbols file already is a .def file (1st line
+    # is EXPORTS), use it as is.
     # If DATA tags from a recent dlltool are present, honour them!
-    archive_expsym_cmds='echo EXPORTS > $output_objdir/$soname-def~
-      _lt_hint=1;
-      cat $export_symbols | while read symbol; do
-	set dummy \$symbol;
-	case \$# in
-	  2) echo "	\$2 @ \$_lt_hint ; " >> $output_objdir/$soname-def;;
-	  *) echo "     \$2 @ \$_lt_hint \$3 ; " >> $output_objdir/$soname-def;;
-	esac;
-	_lt_hint=`expr 1 + \$_lt_hint`;
-      done~
+    archive_expsym_cmds='if test "x`head -1 $export_symbols`" = xEXPORTS; then
+        cp $export_symbols $output_objdir/$soname-def;
+      else
+        echo EXPORTS > $output_objdir/$soname-def;
+        _lt_hint=1;
+        cat $export_symbols | while read symbol; do
+         set dummy \$symbol;
+         case \[$]# in
+           2) echo "   \[$]2 @ \$_lt_hint ; " >> $output_objdir/$soname-def;;
+           *) echo "     \[$]2 @ \$_lt_hint \[$]3 ; " >> $output_objdir/$soname-def;;
+         esac;
+         _lt_hint=`expr 1 + \$_lt_hint`;
+        done;
+      fi~
       '"$ltdll_cmds"'
-      $CC -Wl,--base-file,$output_objdir/$soname-base '$lt_cv_gcj_dll_switch' -Wl,-e,'$dll_entry' -o $lib '$ltdll_obj'$libobjs $deplibs $compiler_flags~
+      $CC -Wl,--base-file,$output_objdir/$soname-base '$lt_cv_cc_dll_switch' -Wl,-e,'$dll_entry' -o $output_objdir/$soname '$ltdll_obj'$libobjs $deplibs $compiler_flags~
       $DLLTOOL --as=$AS --dllname $soname --exclude-symbols '$dll_exclude_symbols' --def $output_objdir/$soname-def --base-file $output_objdir/$soname-base --output-exp $output_objdir/$soname-exp~
-      $CC -Wl,--base-file,$output_objdir/$soname-base $output_objdir/$soname-exp '$lt_cv_gcj_dll_switch' -Wl,-e,'$dll_entry' -o $lib '$ltdll_obj'$libobjs $deplibs $compiler_flags~
-      $DLLTOOL --as=$AS --dllname $soname --exclude-symbols '$dll_exclude_symbols' --def $output_objdir/$soname-def --base-file $output_objdir/$soname-base --output-exp $output_objdir/$soname-exp~
-      $CC $output_objdir/$soname-exp '$lt_cv_gcj_dll_switch' -Wl,-e,'$dll_entry' -o $lib '$ltdll_obj'$libobjs $deplibs $compiler_flags'
+      $CC -Wl,--base-file,$output_objdir/$soname-base $output_objdir/$soname-exp '$lt_cv_cc_dll_switch' -Wl,-e,'$dll_entry' -o $output_objdir/$soname '$ltdll_obj'$libobjs $deplibs $compiler_flags~
+      $DLLTOOL --as=$AS --dllname $soname --exclude-symbols '$dll_exclude_symbols' --def $output_objdir/$soname-def --base-file $output_objdir/$soname-base --output-exp $output_objdir/$soname-exp --output-lib $output_objdir/$libname.dll.a~
+      $CC $output_objdir/$soname-exp '$lt_cv_cc_dll_switch' -Wl,-e,'$dll_entry' -o $output_objdir/$soname '$ltdll_obj'$libobjs $deplibs $compiler_flags'
     ;;
 
-  netbsd*)
+  netbsd* | knetbsd*-gnu)
     if echo __ELF__ | $CC -E - | grep __ELF__ >/dev/null; then
       archive_cmds='$LD -Bshareable $libobjs $deplibs $linker_flags -o $lib'
       wlarc=
     else
-      archive_cmds='$CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname -o $lib'
-      archive_expsym_cmds='$CC -shared $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
+      archive_cmds='$CC -shared -nodefaultlibs $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname -o $lib'
+      archive_expsym_cmds='$CC -shared -nodefaultlibs $libobjs $deplibs $compiler_flags ${wl}-soname $wl$soname ${wl}-retain-symbols-file $wl$export_symbols -o $lib'
     fi
     ;;
 
@@ -239,7 +247,7 @@ EOF
   fi
 else
   # PORTME fill in a description of your system's linker (not GNU ld)
-  case "$host_os" in
+  case $host_os in
   aix3*)
     allow_undefined_flag=unsupported
     always_export_symbols=yes
@@ -254,39 +262,95 @@ else
     fi
     ;;
 
-  aix4*)
-    hardcode_libdir_flag_spec='${wl}-b ${wl}nolibpath ${wl}-b ${wl}libpath:$libdir:/usr/lib:/lib'
+  aix4* | aix5*)
+    hardcode_direct=yes
     hardcode_libdir_separator=':'
+    link_all_deplibs=yes
+    # When large executables or shared objects are built, AIX ld can
+    # have problems creating the table of contents.  If linking a library
+    # or program results in "error TOC overflow" add -mminimal-toc to
+    # CXXFLAGS/CFLAGS for g++/gcc.  In the cases where that is not
+    # enough to fix the problem, add -Wl,-bbigtoc to LDFLAGS.
     if test "$with_gcc" = yes; then
-      collect2name=`${CC} -print-prog-name=collect2`
-      if test -f "$collect2name" && \
-	 strings "$collect2name" | grep resolve_lib_name >/dev/null
-      then
-	# We have reworked collect2
-	hardcode_direct=yes
+      case $host_os in aix4.[012]|aix4.[012].*)
+      # We only want to do this on AIX 4.2 and lower, the check
+      # below for broken collect2 doesn't work under 4.3+
+        collect2name=`${CC} -print-prog-name=collect2`
+        if test -f "$collect2name" && \
+	   strings "$collect2name" | grep resolve_lib_name >/dev/null
+        then
+	  # We have reworked collect2
+	  hardcode_direct=yes
+        else
+	  # We have old collect2
+	  hardcode_direct=unsupported
+	  # It fails to find uninstalled libraries when the uninstalled
+	  # path is not listed in the libpath.  Setting hardcode_minus_L
+	  # to unsupported forces relinking
+	  hardcode_minus_L=yes
+	  hardcode_libdir_flag_spec='-L$libdir'
+	  hardcode_libdir_separator=
+        fi
+      esac
+      shared_flag='-shared'
+    else
+      # not using gcc
+      if test "$host_cpu" = ia64; then
+        shared_flag='${wl}-G'
       else
-	# We have old collect2
-	hardcode_direct=unsupported
-	# It fails to find uninstalled libraries when the uninstalled
-	# path is not listed in the libpath.  Setting hardcode_minus_L
-	# to unsupported forces relinking
-	hardcode_minus_L=yes
-	hardcode_libdir_flag_spec='-L$libdir'
-	hardcode_libdir_separator=
+        shared_flag='${wl}-bM:SRE'
+      fi
+    fi
+
+    if test "$host_cpu" = ia64; then
+      # On IA64, the linker does run time linking by default, so we don't
+      # have to do anything special.
+      aix_use_runtimelinking=no
+      if test $with_gnu_ld = no; then
+        exp_sym_flag='-Bexport'
+        no_entry_flag=""
       fi
-      shared_flag='-shared'
     else
-      shared_flag='${wl}-bM:SRE'
-      hardcode_direct=yes
+      # Test if we are trying to use run time linking, or normal AIX style linking.
+      # If -brtl is somewhere in LDFLAGS, we need to do run time linking.
+      aix_use_runtimelinking=no
+      for ld_flag in $LDFLAGS; do
+        if (test $ld_flag = "-brtl" || test $ld_flag = "-Wl,-brtl" ); then
+          aix_use_runtimelinking=yes
+          break
+        fi
+      done
+      exp_sym_flag='-bexport'
+      no_entry_flag='-bnoentry'
     fi
-    allow_undefined_flag=' ${wl}-berok'
-    archive_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${wl}-bexpall ${wl}-bnoentry${allow_undefined_flag}'
-    archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${wl}-bE:$export_symbols ${wl}-bnoentry${allow_undefined_flag}'
-    case "$host_os" in aix4.[01]|aix4.[01].*)
-      # According to Greg Wooledge, -bexpall is only supported from AIX 4.2 on
-      always_export_symbols=yes ;;
-    esac
-   ;;
+    # -bexpall does not export symbols beginning with underscore (_)
+    always_export_symbols=yes
+    if test "$aix_use_runtimelinking" = yes; then
+      # Warning - without using the other run time loading flags (-brtl), -berok will
+      #           link without error, but may produce a broken library.
+      allow_undefined_flag=' ${wl}-berok'
+      hardcode_libdir_flag_spec='${wl}-blibpath:$libdir:/usr/lib:/lib'
+      archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${allow_undefined_flag} '"\${wl}$no_entry_flag \${wl}$exp_sym_flag:\$export_symbols"
+    else
+      if test "$host_cpu" = ia64; then
+        if test $with_gnu_ld = no; then
+          hardcode_libdir_flag_spec='${wl}-R $libdir:/usr/lib:/lib'
+          allow_undefined_flag="-z nodefs"
+          archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${wl}${allow_undefined_flag} '"\${wl}$no_entry_flag \${wl}$exp_sym_flag:\$export_symbols"
+        fi
+      else
+        allow_undefined_flag=' ${wl}-berok'
+        # -bexpall does not export symbols beginning with underscore (_)
+        always_export_symbols=yes
+        # Exported symbols can be pulled into shared objects from archives
+        whole_archive_flag_spec=' '
+        build_libtool_need_lc=yes
+        hardcode_libdir_flag_spec='${wl}-blibpath:$libdir:/usr/lib:/lib'
+        # This is similar to how AIX traditionally builds it's shared libraries.
+        archive_expsym_cmds="\$CC $shared_flag"' -o $output_objdir/$soname $libobjs $deplibs $compiler_flags ${wl}-bE:$export_symbols ${wl}-bnoentry${allow_undefined_flag}~$AR $AR_FLAGS $output_objdir/$libname$release.a $output_objdir/$soname'
+      fi
+    fi
+  ;;
 
   amigaos*)
     archive_cmds='$rm $output_objdir/a2ixlibrary.data~$echo "#define NAME $libname" > $output_objdir/a2ixlibrary.data~$echo "#define LIBRARY_ID 1" >> $output_objdir/a2ixlibrary.data~$echo "#define VERSION $major" >> $output_objdir/a2ixlibrary.data~$echo "#define REVISION $revision" >> $output_objdir/a2ixlibrary.data~$AR $AR_FLAGS $lib $libobjs~$RANLIB $lib~(cd $output_objdir && a2ixlibrary -32)'
@@ -311,9 +375,52 @@ else
     old_archive_from_new_cmds='true'
     # FIXME: Should let the user specify the lib program.
     old_archive_cmds='lib /OUT:$oldlib$oldobjs$old_deplibs'
-    fix_srcfile_path='`cygpath -w $srcfile`'
+    fix_srcfile_path='`cygpath -w "$srcfile"`'
+    ;;
+
+  darwin* | rhapsody*)
+    case "$host_os" in
+    rhapsody* | darwin1.[[012]])
+	allow_undefined_flag='-undefined suppress'
+	;;
+    *) # Darwin 1.3 on
+      if test -z ${MACOSX_DEPLOYMENT_TARGET} ; then
+	  allow_undefined_flag='-flat_namespace -undefined suppress'
+      else
+	  case ${MACOSX_DEPLOYMENT_TARGET} in
+	      10.[[012]])
+		  allow_undefined_flag='-flat_namespace -undefined suppress'
+		  ;;
+	      10.*)
+		  allow_undefined_flag='-undefined dynamic_lookup'
+		  ;;
+	  esac
+      fi
+      ;;
+    esac
+    # Disable shared library build on OS-X older than 10.3.
+    case $host_os in
+	darwin[1-6]*)
+	    can_build_shared=no
+	    ;;
+	darwin7*)
+	    can_build_shared=yes
+	    ;;
+    esac
+    output_verbose_link_cmd='echo'
+    archive_cmds='$CC -r ${wl}-bind_at_load -keep_private_externs -nostdlib -o ${lib}-master.o $libobjs~$CC -dynamiclib $allow_undefined_flag -o $lib ${lib}-master.o $deplibs $compiler_flags -install_name $rpath/$soname $verstring'
+    module_cmds='$CC ${wl}-bind_at_load $allow_undefined_flag -o $lib -bundle $libobjs $deplibs$compiler_flags'
+      # Don't fix this by using the ld -exported_symbols_list flag, it doesn't exist in older darwin ld's
+    archive_expsym_cmds='sed -e "s,#.*,," -e "s,^[    ]*,," -e "s,^\(..*\),_&," < $export_symbols > $output_objdir/${libname}-symbols.expsym~$CC -r ${wl}-bind_at_load -keep_private_externs -nostdlib -o ${lib}-master.o $libobjs~$CC -dynamiclib $allow_undefined_flag -o $lib ${lib}-master.o $deplibs $compiler_flags -install_name $rpath/$soname $verstring~nmedit -s $output_objdir/${libname}-symbols.expsym ${lib}'
+    module_expsym_cmds='sed -e "s,#.*,," -e "s,^[    ]*,," -e "s,^\(..*\),_&," < $export_symbols > $output_objdir/${libname}-symbols.expsym~$CC $allow_undefined_flag  -o $lib -bundle $libobjs $deplibs$compiler_flags~nmedit -s $output_objdir/${libname}-symbols.expsym ${lib}'
+    hardcode_direct=no
+    hardcode_automatic=yes
+    hardcode_shlibpath_var=unsupported
+    whole_archive_flag_spec='-all_load $convenience'
+    link_all_deplibs=yes
     ;;
 
+
   freebsd1*)
     ld_shlibs=no
     ;;
@@ -338,7 +445,7 @@ else
     ;;
 
   # FreeBSD 3 and greater uses gcc -shared to do shared libraries.
-  freebsd*)
+  freebsd* | kfreebsd*-gnu)
     archive_cmds='$CC -shared -o $lib $libobjs $deplibs $compiler_flags'
     hardcode_libdir_flag_spec='-R$libdir'
     hardcode_direct=yes
@@ -346,7 +453,7 @@ else
     ;;
 
   hpux9* | hpux10* | hpux11*)
-    case "$host_os" in
+    case $host_os in
     hpux9*) archive_cmds='$rm $output_objdir/$soname~$LD -b +b $install_libdir -o $output_objdir/$soname $libobjs $deplibs $linker_flags~test $output_objdir/$soname = $lib || mv $output_objdir/$soname $lib' ;;
     *) archive_cmds='$LD -b +h $soname +b $install_libdir -o $lib $libobjs $deplibs $linker_flags' ;;
     esac
@@ -369,11 +476,11 @@ else
     link_all_deplibs=yes
     ;;
 
-  netbsd*)
+  netbsd* | knetbsd*-gnu)
     if echo __ELF__ | $CC -E - | grep __ELF__ >/dev/null; then
       archive_cmds='$LD -Bshareable -o $lib $libobjs $deplibs $linker_flags'  # a.out
     else
-      archive_cmds='$LD -shared -o $lib $libobjs $deplibs $linker_flags'      # ELF
+      archive_cmds='$LD -shared -nodefaultlibs -o $lib $libobjs $deplibs $linker_flags'      # ELF
     fi
     hardcode_libdir_flag_spec='${wl}-R$libdir'
     hardcode_direct=yes
@@ -427,18 +534,22 @@ else
     ;;
 
   solaris*)
-    no_undefined_flag=' -z text'
-    # $CC -shared without GNU ld will not create a library from C++
-    # object files and a static libstdc++, better avoid it by now
-    archive_cmds='$LD -G${allow_undefined_flag} -h $soname -o $lib $libobjs $deplibs $linker_flags'
+    no_undefined_flag=' ${wl}-z ${wl}defs'
+    archive_cmds='$CC -shared -nostdlib $LDFLAGS $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags ${wl}-h $wl$soname -o $lib'
     archive_expsym_cmds='$echo "{ global:" > $lib.exp~cat $export_symbols | sed -e "s/\(.*\)/\1;/" >> $lib.exp~$echo "local: *; };" >> $lib.exp~
-		$LD -G${allow_undefined_flag} -M $lib.exp -h $soname -o $lib $libobjs $deplibs $linker_flags~$rm $lib.exp'
-    hardcode_libdir_flag_spec='-R$libdir'
+      $CC -shared -nostdlib ${wl}-M $wl$lib.exp -o $lib $predep_objects $libobjs $deplibs $postdep_objects $compiler_flags~$rm $lib.exp'
+
+    # Commands to make compiler produce verbose output that lists
+    # what "hidden" libraries, object files and flags are used when
+    # linking a shared library.
+    output_verbose_link_cmds="$CC -shared $CFLAGS -v conftest.$objext 2>&1 | egrep \"\-L\""
+
+    hardcode_libdir_flag_spec='${wl}-R $wl$libdir'
     hardcode_shlibpath_var=no
-    case "$host_os" in
+    case $host_os in
     solaris2.[0-5] | solaris2.[0-5].*) ;;
     *) # Supported since Solaris 2.6 (maybe 2.5.1?)
-      whole_archive_flag_spec='-z allextract$convenience -z defaultextract' ;;
+      whole_archive_flag_spec='${wl}-z ${wl}allextract$convenience ${wl}-z ${wl}defaultextract' ;;
     esac
     link_all_deplibs=yes
     ;;
@@ -507,8 +618,13 @@ else
     runpath_var=LD_RUN_PATH
     ;;
 
-  unixware7*)
-    archive_cmds='$LD -G -h $soname -o $lib $libobjs $deplibs $linker_flags'
+  sysv5uw7* | unixware7*)
+    no_undefined_flag='${wl}-z ${wl}text'
+    if test "$GCC" = yes; then
+      archive_cmds='$CC -shared ${wl}-h ${wl}$soname -o $lib $libobjs $deplibs $compiler_flags'
+    else
+      archive_cmds='$CC -G ${wl}-h ${wl}$soname -o $lib $libobjs $deplibs $compiler_flags'
+    fi
     runpath_var='LD_RUN_PATH'
     hardcode_shlibpath_var=no
     ;;
@@ -533,7 +649,7 @@ fi
     ac_cv_prog_cc_wl='-Wl,'
     ac_cv_prog_cc_static='-static'
 
-    case "$host_os" in
+    case $host_os in
     beos* | irix5* | irix6* | osf3* | osf4* | osf5*)
       # PIC is the default for these OSes.
       ;;
@@ -547,7 +663,7 @@ fi
       ac_cv_prog_cc_static="$ac_cv_prog_cc_static ${ac_cv_prog_cc_wl}-lC"
       ;;
     *djgpp*)
-      # DJGPP does not support shared libraries at all
+      # DJGPP does not suppot shared libraries at all
       ac_cv_prog_cc_pic=
       ;;
     cygwin* | mingw* | os2*)
@@ -555,6 +671,12 @@ fi
       # built for inclusion in a dll (and should export symbols for example).
       ac_cv_prog_cc_pic='-DDLL_EXPORT'
       ;;
+
+    darwin* | rhapsody*)
+      # PIC is the default on this platform
+      # Common symbols not allowed in MH_DYLIB files
+      ac_cv_prog_cc_pic='-fno-common'
+      ;;
     amigaos*)
       # FIXME: we need at least 68020 code to build shared libraries, but
       # adding the `-m68020' flag to GCC prevents building anything better,
@@ -573,3 +695,6 @@ fi
 
 # GCJ did not exist at the time GCC didn't implicitly link libc in.
 need_lc=no
+
+# All existing releases of GCJ support `-c -o'.
+lt_cv_compiler_c_o=yes