X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=hints%2Faix.sh;h=2d2468a3371884c550238f9c1cf0930dd6061c29;hb=5b3e00df85f0acd4faa55a140aa762a15b19dca3;hp=0614ce7ee9bce030d59d3323dd5632c4d2465bfe;hpb=efeaa891beb26deace23d0f0d79d1dabb1e7e0a1;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/hints/aix.sh b/hints/aix.sh
index 0614ce7..2d2468a 100644
--- a/hints/aix.sh
+++ b/hints/aix.sh
@@ -2,7 +2,8 @@
 # AIX 3.x.x hints thanks to Wayne Scott <wscott@ichips.intel.com>
 # AIX 4.1 hints thanks to Christopher Chan-Nui <channui@austin.ibm.com>.
 # AIX 4.1 pthreading by Christopher Chan-Nui <channui@austin.ibm.com> and
-#         Jarkko Hietaniemi <jhi@iki.fi>.
+#	  Jarkko Hietaniemi <jhi@iki.fi>.
+# AIX 4.3.x LP64 build by Steven Hirsch <hirschs@btv.ibm.com>
 # Merged on Mon Feb  6 10:22:35 EST 1995 by
 #   Andy Dougherty  <doughera@lafcol.lafayette.edu>
 
@@ -17,7 +18,7 @@
 #
 #    - use nm in AIX 43x and above
 #    - gcc + threads now builds
-#    - added support for socks, when Dccflags=-DSOCKS specified
+#    [(added support for socks) Jul 99 SOCKS support rewritten]
 #
 # Notes:
 #
@@ -37,13 +38,15 @@
 # pages state:
 #    setrgid: The EPERM error code is always returned.
 #    setruid: The EPERM error code is always returned. Processes cannot
-#             reset only their real user IDs.
+#	      reset only their real user IDs.
 d_setrgid='undef'
 d_setruid='undef'
 
 alignbytes=8
 
-usemymalloc='n'
+case "$usemymalloc" in
+'')  usemymalloc='n' ;;
+esac
 
 # Intuiting the existence of system calls under AIX is difficult,
 # at best; the safest technique is to find them empirically.
@@ -51,16 +54,55 @@ usemymalloc='n'
 # AIX 4.3.* and above default to using nm for symbol extraction
 case "$osvers" in
    3.*|4.1.*|4.2.*)
-      usenm='undef'
+      case "$usenm" in
+	  '') usenm='undef'
+	  esac
+      case "$usenativedlopen" in
+	  '') usenativedlopen='false'
+	  esac
       ;;
    *)
-      usenm='true'
+      case "$usenm" in
+	  '') usenm='true'
+	  esac
+      case "$usenativedlopen" in
+	  '') usenativedlopen='true'
+	  esac
       ;;
 esac
 
 so="a"
+# AIX itself uses .o (libc.o) but we prefer compatibility
+# with the rest of the world and with rest of the scripting
+# languages (Tcl, Python) and related systems (SWIG).
+# Stephanie Beals <bealzy@us.ibm.com>
 dlext="so"
 
+# Take possible hint from the environment.  If 32-bit is set in the
+# environment, we can override it later.  If set for 64, the
+# 'sizeof' test sees a native 64-bit architecture and never looks back.
+case "$OBJECT_MODE" in
+32)
+    cat >&4 <<EOF
+
+You have OBJECT_MODE=32 set in the environment. 
+I take this as a hint you do not want to
+build for a 64-bit address space. You will be
+given the opportunity to change this later.
+EOF
+    ;;
+64)
+    cat >&4 <<EOF
+
+You have OBJECT_MODE=64 set in the environment. 
+This forces a full 64-bit build.  If that is
+not what you intended, please terminate this
+program, unset it and restart.
+EOF
+    ;;
+*)  ;;
+esac
+
 # Trying to set this breaks the POSIX.c compilation
 
 # Make setsockopt work correctly.  See man page.
@@ -71,6 +113,8 @@ case "$archname" in
 '') archname="$osname" ;;
 esac
 
+cc=${cc:-cc}
+
 case "$osvers" in
 3*) d_fchmod=undef
     ccflags="$ccflags -D_ALL_SOURCE"
@@ -79,7 +123,7 @@ case "$osvers" in
     ccflags="$ccflags -D_ALL_SOURCE -D_ANSI_C_SOURCE -D_POSIX_SOURCE"
     case "$cc" in
      *gcc*) ;;
-     *) ccflags="$ccflags -qmaxmem=8192" ;;
+     *) ccflags="$ccflags -qmaxmem=16384 -qnoansialias" ;;
     esac
     nm_opt='-B'
     ;;
@@ -92,162 +136,384 @@ d_setreuid='undef'
 # Changes for dynamic linking by Wayne Scott <wscott@ichips.intel.com>
 #
 # Tell perl which symbols to export for dynamic linking.
+cccdlflags='none'      # All AIX code is position independent
+cc_type=xlc
 case "$cc" in
-*gcc*) ccdlflags='-Xlinker -bE:perl.exp' ;;
-*) ccdlflags='-bE:perl.exp' ;;
+*gcc*)
+   cc_type=gcc
+   ccdlflags='-Xlinker' ;;
+*) ccversion=`lslpp -L | grep 'C for AIX Compiler$' | awk '{print $2}'`
+   case "$ccversion" in
+     '') ccversion=`lslpp -L | grep 'IBM C and C++ Compilers LUM$' | awk '{print $2}'`
+	 ;;
+     *.*.*.*.*.*.*)		# Ahhrgg, more than one C compiler installed
+	 first_cc_path=`which ${cc:-cc}`
+	 case "$first_cc_path" in
+	   *vac*)
+	     cc_type=vac ;;
+	   /usr/bin/cc)		# Check the symlink
+	     if [ -h $first_cc_path ] ; then
+	       ls -l $first_cc_path > reflect
+	       if grep -i vac reflect >/dev/null 2>&1 ; then
+		 cc_type=vac
+		 fi
+	       rm -f reflect
+	       fi
+	     ;;
+	   esac
+	 ccversion=`lslpp -L | grep 'C for AIX Compiler$' | grep -i $cc_type | awk '{print $2}' | head -1`
+	 ;;
+     esac
+   case "$ccversion" in
+     3.6.6.0)
+	optimize='none'
+	;;
+     4.4.0.0|4.4.0.1|4.4.0.2)
+	cat >&4 <<EOF
+***
+*** This C compiler ($ccversion) is outdated.
+***
+*** Please upgrade to at least 4.4.0.3.
+***
+EOF
+	;;
+     5.0.0.0)
+	cat >&4 <<EOF
+***
+*** This C compiler ($ccversion) is known to have too many optimizer
+*** bugs to compile a working Perl.
+***
+*** Consider upgrading your C compiler, or getting the GNU cc (gcc).
+***
+*** Cannot continue, aborting.
+EOF
+	exit 1
+	;;
+     5.0.1.0)
+	cat >&4 <<EOF
+***
+*** This C compiler ($ccversion) is known to have optimizer problems
+*** when compiling regcomp.c.
+***
+*** Disabling optimization for that file but consider upgrading
+*** your C compiler.
+***
+EOF
+regcomp_cflags='optimize='
+	;;
+     esac
+esac
+# the required -bE:$installarchlib/CORE/perl.exp is added by
+# libperl.U (Configure) later.
+
+case "$ldlibpthname" in
+'') ldlibpthname=LIBPATH ;;
 esac
 
 # The first 3 options would not be needed if dynamic libs. could be linked
 # with the compiler instead of ld.
 # -bI:$(PERL_INC)/perl.exp  Read the exported symbols from the perl binary
-# -bE:$(BASEEXT).exp        Export these symbols.  This file contains only one
-#                           symbol: boot_$(EXP)  can it be auto-generated?
+# -bE:$(BASEEXT).exp	    Export these symbols.  This file contains only one
+#			    symbol: boot_$(EXP)	 can it be auto-generated?
 case "$osvers" in
 3*) 
-    lddlflags="$lddlflags -H512 -T512 -bhalt:4 -bM:SRE -bI:$(PERL_INC)/perl.exp -bE:$(BASEEXT).exp -e _nostart"
+    lddlflags="$lddlflags -H512 -T512 -bhalt:4 -bM:SRE -bI:\$(PERL_INC)/perl.exp -bE:\$(BASEEXT).exp -e _nostart -lc"
     ;;
 *) 
-    lddlflags="$lddlflags -bhalt:4 -bM:SRE -bI:$(PERL_INC)/perl.exp -bE:$(BASEEXT).exp -b noentry"
+    lddlflags="$lddlflags -bhalt:4 -bM:SRE -bI:\$(PERL_INC)/perl.exp -bE:\$(BASEEXT).exp -bnoentry -lc"
     ;;
 esac
-
-#
-# if $ccflags contains -DSOCKS, then add socks library support.
-#
-# SOCKS support also requires each source module with socket support
-# add the following lines directly after the #include <socket.h>:
-#
-#   #ifdef SOCKS
-#   #include <socks.h>
-#   #endif
-#
-# It is expected that libsocks.a resides in /usr/local/lib and that
-# socks.h resides in /usr/local/include. If these files live some
-# different place then modify 
-#
-
-for arg in $ccflags ; do
-
-   if [ "$arg" = "-DSOCKS" ] ; then
-
-      sockslib=socks5
-      incpath=/usr/local/include
-      libpath=/usr/local/lib
-
-      echo >&4 "SOCKS using $incpath/socks.h and $libpath/lib${sockslib}.a"
-      echo >&4 "SOCKS requires source modifications. #include <socket.h> must change to:"
-      echo >&4
-      echo >&4 "   #include <socket.h>"
-      echo >&4 "   #ifdef SOCKS"
-      echo >&4 "   #include <socks.h>"
-      echo >&4 "   #endif"
-      echo >&4
-      echo >&4 "in some or all of the following files:"
-      echo >&4
-
-      for arg in `find . \( -name '*.c' -o -name '*.xs' -o -name '*.h' \) \
-                         -exec egrep -l '#.*include.*socket\.h' {} \; | \
-                         egrep -v "win32|vms|t/lib|Socket.c` ; do
-         echo >&4 "   $arg"
-      done
-
-      echo >&4
-
-      lddlflags="$lddlflags -l$sockslib"
-
-      # setting $libs here breaks the optional libraries search
-      # for some reason, so use $libswanted instead
-      #libs="$libs -lsocks5"
-
-      libswanted="$libswanted $sockslib"
-
-      #
-      # path for include file
-      #
-
-      locincpth="$locincpath /usr/local/include"
-
-      #
-      # path for library not needed, if in /usr/local/lib as that
-      # directory is already searched.
-      #
-
-      #loclibpth="$loclibpath /usr/local/lib"
-
-      break
-
-   fi
-
-done
-
-lddllibc="-lc"
+# AIX 4.2 (using latest patchlevels on 20001130) has a broken bind
+# library (getprotobyname and getprotobynumber are outversioned by
+# the same calls in libc, at least for xlc version 3...
+case "`oslevel`" in
+    4.2.1.*)
+      case "$ccversion" in    # Don't know if needed for gcc
+          3.1.4.*|5.0.2.*)    # libswanted "bind ... c ..." => "... c bind ..."
+              set `echo X "$libswanted "| sed -e 's/ bind\( .*\) \([cC]\) / \1 \2 bind /'`
+              shift
+              libswanted="$*"
+              ;;
+          esac
+      ;;
+    esac
 
 # This script UU/usethreads.cbu will get 'called-back' by Configure 
 # after it has prompted the user for whether to use threads.
 cat > UU/usethreads.cbu <<'EOCBU'
 case "$usethreads" in
 $define|true|[yY]*)
-        ccflags="$ccflags -DNEED_PTHREAD_INIT"
-        case "$cc" in
-        gcc) ;;
-        cc_r) ;;
-        cc|xlc_r) 
+	ccflags="$ccflags -DNEED_PTHREAD_INIT"
+	case "$cc" in
+	gcc) ;;
+	cc_r) ;;
+	cc|xl[cC]_r) 
 	    echo >&4 "Switching cc to cc_r because of POSIX threads."
 	    # xlc_r has been known to produce buggy code in AIX 4.3.2.
-	    # (e.g. pragma/overload core dumps)
+	    # (e.g. pragma/overload core dumps)	 Let's suspect xlC_r, too.
 	    # --jhi@iki.fi
 	    cc=cc_r
-            ;;
-        '') 
+	    ;;
+	'') 
 	    cc=cc_r
-            ;;
-        *)
- 	    cat >&4 <<EOM
-For pthreads you should use the AIX C compiler cc_r.
-(now your compiler was '$cc')
-Cannot continue, aborting.
+	    ;;
+	*)
+	    cat >&4 <<EOM
+*** For pthreads you should use the AIX C compiler cc_r.
+*** (now your compiler was set to '$cc')
+*** Cannot continue, aborting.
 EOM
- 	    exit 1
+	    exit 1
 	    ;;
-        esac
-
-        # Add the POSIX threads library and the re-entrant libc.
-
-        lddllibc="-lpthreads -lc_r"
+	esac
+
+	# c_rify libswanted.
+	set `echo X "$libswanted "| sed -e 's/ \([cC]\) / \1_r /g'`
+	shift
+	libswanted="$*"
+	# c_rify lddlflags.
+	set `echo X "$lddlflags "| sed -e 's/ \(-l[cC]\) / \1_r /g'`
+	shift
+	lddlflags="$*"
+
+	# Insert pthreads to libswanted, before any libc or libC.
+	set `echo X "$libswanted "| sed -e 's/ \([cC]_r\) / pthreads \1 /'`
+	shift
+	libswanted="$*"
+	# Insert pthreads to lddlflags, before any libc or libC.
+	set `echo X "$lddlflags " | sed -e 's/ \(-l[cC]_r\) / -lpthreads \1 /'`
+	shift
+	lddlflags="$*"
 
-        # Add the c_r library to the list of wanted libraries.
-        # Make sure the c_r library is before the c library or
-        # make will fail.
-        set `echo X "$libswanted "| sed -e 's/ c / pthreads c_r /'`
-        shift
-        libswanted="$*"
 	;;
 esac
+EOCBU
+
+# This script UU/uselargefiles.cbu will get 'called-back' by Configure 
+# after it has prompted the user for whether to use large files.
+cat > UU/uselargefiles.cbu <<'EOCBU'
+case "$uselargefiles" in
+''|$define|true|[yY]*)
+    # Configure should take care of use64bitint and use64bitall being
+    # defined before uselargefiles.cbu is consulted.
+    if test X"$use64bitint:$quadtype" = X"$define:long" -o X"$use64bitall" = Xdefine; then
+# Keep these at the left margin.
+ccflags_uselargefiles="`getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
+ldflags_uselargefiles="`getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
+    else
+# Keep these at the left margin.
+ccflags_uselargefiles="`getconf XBS5_ILP32_OFFBIG_CFLAGS 2>/dev/null`"
+ldflags_uselargefiles="`getconf XBS5_ILP32_OFFBIG_LDFLAGS 2>/dev/null`"
+    fi
+	# _Somehow_ in AIX 4.3.1.0 the above getconf call manages to
+	# insert(?) *something* to $ldflags so that later (in Configure) evaluating
+	# $ldflags causes a newline after the '-b64' (the result of the getconf).
+	# (nothing strange shows up in $ldflags even in hexdump;
+	#  so it may be something (a bug) in the shell, instead?)
+	# Try it out: just uncomment the below line and rerun Configure:
+# echo >&4 "AIX 4.3.1.0 $ldflags_uselargefiles mystery" ; exit 1
+	# Just don't ask me how AIX does it, I spent hours wondering.
+	# Therefore the line re-evaluating ldflags_uselargefiles: it seems to fix
+	# the whatever it was that AIX managed to break. --jhi
+	ldflags_uselargefiles="`echo $ldflags_uselargefiles`"
+    if test X"$use64bitint:$quadtype" = X"$define:long" -o X"$use64bitall" = Xdefine; then
+# Keep this at the left margin.
+libswanted_uselargefiles="`getconf XBS5_LP64_OFF64_LIBS 2>/dev/null|sed -e 's@^-l@@' -e 's@ -l@ @g`"
+    else
+# Keep this at the left margin.
+libswanted_uselargefiles="`getconf XBS5_ILP32_OFFBIG_LIBS 2>/dev/null|sed -e 's@^-l@@' -e 's@ -l@ @g`"
+    fi
+	case "$ccflags_uselargefiles$ldflags_uselargefiles$libs_uselargefiles" in
+	'');;
+	*) ccflags="$ccflags $ccflags_uselargefiles"
+	   ldflags="$ldflags $ldflags_uselargefiles"
+	   libswanted="$libswanted $libswanted_uselargefiles"
+	   ;;
+	esac
+	case "$gccversion" in
+	'') ;;
+	*)
+	cat >&4 <<EOM
+
+*** Warning: gcc in AIX might not work with the largefile support of Perl
+*** (default since 5.6.0), this combination hasn't been tested.
+*** I will try, though.
 
+EOM
+	# Remove xlc-spefific -qflags.
+        ccflags="`echo $ccflags | sed -e 's@ -q[^ ]*@ @g' -e 's@^-q[^ ]* @@g'`"
+        ldflags="`echo $ldflags | sed -e 's@ -q[^ ]*@ @g' -e 's@^-q[^ ]* @@g'`"
+        # Move xld-spefific -bflags.
+        ccflags="`echo $ccflags | sed -e 's@ -b@ -Wl,-b@g'`"
+        ldflags="`echo ' '$ldflags | sed -e 's@ -b@ -Wl,-b@g'`"
+        lddlflags="`echo ' '$lddlflags | sed -e 's@ -b@ -Wl,-b@g'`"
+        ld='gcc'
+        echo >&4 "(using ccflags   $ccflags)"
+        echo >&4 "(using ldflags   $ldflags)"
+        echo >&4 "(using lddlflags $lddlflags)"
+        ;; 
+        esac
+        ;;
+esac
 EOCBU
 
-lddlflags="$lddlflags $lddllibc"
+# This script UU/use64bitint.cbu will get 'called-back' by Configure 
+# after it has prompted the user for whether to use 64 bit integers.
+cat > UU/use64bitint.cbu <<'EOCBU'
+case "$use64bitint" in
+$define|true|[yY]*)
+	    case "`oslevel`" in
+	    3.*|4.[012].*)
+		cat >&4 <<EOM
+AIX `oslevel` does not support 64-bit interfaces.
+You should upgrade to at least AIX 4.3.
+EOM
+		exit 1
+		;;
+	    esac
+	    ;;
+esac
+EOCBU
 
-# This script UU/use64bits.cbu will get 'called-back' by Configure 
-# after it has prompted the user for whether to use 64 bits.
-cat > UU/use64bits.cbu <<'EOCBU'
-case "$use64bits" in
+cat > UU/use64bitall.cbu <<'EOCBU'
+# This script UU/use64bitall.cbu will get 'called-back' by Configure 
+# after it has prompted the user for whether to be maximally 64-bitty.
+case "$use64bitall" in
 $define|true|[yY]*)
-	    case "`uname -r`" in
+	    case "`oslevel`" in
 	    3.*|4.[012].*)
 		cat >&4 <<EOM
-AIX `uname -r` does not support 64-bit interfaces.
+AIX `oslevel` does not support 64-bit interfaces.
 You should upgrade to at least AIX 4.3.
 EOM
 		exit 1
 		;;
 	    esac
-	    ccflags="$ccflags `getconf XBS5_LPBIG_OFFBIG_CFLAGS`"
-    	    ccflags="$ccflags -DUSE_LONG_LONG"
-	    ldflags="$ldflags `getconf XBS5_LPBIG_OFFBIG_LDFLAGS`"
-	    libswanted="$libswanted `getconf XBS5_LPBIG_OFFBIG_LIBS`"
-	    # When a 64-bit cc becomes available $archname64
-	    # may need setting so that $archname gets it attached.
+	    echo " "
+	    echo "Checking the CPU width of your hardware..." >&4
+	    $cat >size.c <<EOCP
+#include <stdio.h>
+#include <sys/systemcfg.h>
+int main (void)
+{
+  printf("%d\n",_system_configuration.width);
+  return(0);
+}
+EOCP
+	    set size
+	    if eval $compile_ok; then
+		qacpuwidth=`./size`
+		echo "You are running on $qacpuwidth bit hardware."
+	    else
+		dflt="32"
+		echo " "
+		echo "(I can't seem to compile the test program.  Guessing...)"
+		rp="What is the width of your CPU (in bits)?"
+		. ./myread
+		qacpuwidth="$ans"
+	    fi
+	    $rm -f size.c size
+	    case "$qacpuwidth" in
+	    32*)
+		cat >&4 <<EOM
+Bzzzt! At present, you can only perform a
+full 64-bit build on a 64-bit machine.
+EOM
+		exit 1
+		;;
+	    esac
+	    qacflags="`getconf XBS5_LP64_OFF64_CFLAGS 2>/dev/null`"
+	    qaldflags="`getconf XBS5_LP64_OFF64_LDFLAGS 2>/dev/null`"
+	    # See jhi's comments above regarding this re-eval.  I've
+	    # seen similar weirdness in the form of:
+	    #
+# 1506-173 (W) Option lm is not valid.  Enter xlc for list of valid options.
+	    #
+	    # error messages from 'cc -E' invocation. Again, the offending
+	    # string is simply not detectable by any means.  Since it doesn't
+	    # do any harm, I didn't pursue it. -- sh
+	    qaldflags="`echo $qaldflags`"
+	    qalibs="`getconf XBS5_LP64_OFF64_LIBS 2>/dev/null|sed -e 's@^-l@@' -e 's@ -l@ @g`"
+	    # -q32 and -b32 may have been set by uselargefiles or user.
+    	    # Remove them.
+	    ccflags="`echo $ccflags | sed -e 's@-q32@@'`"
+	    ldflags="`echo $ldflags | sed -e 's@-b32@@'`"
+	    # Tell archiver to use large format.  Unless we remove 'ar'
+	    # from 'trylist', the Configure script will just reset it to 'ar'
+	    # immediately prior to writing config.sh.  This took me hours
+	    # to figure out.
+	    trylist="`echo $trylist | sed -e 's@^ar @@' -e 's@ ar @ @g' -e 's@ ar$@@'`"
+	    ar="ar -X64"
+	    nm_opt="-X64 $nm_opt"
+	    # Note: Placing the 'qacflags' variable into the 'ldflags' string
+	    # is NOT a typo.  ldflags is passed to the C compiler for final
+	    # linking, and it wants -q64 (-b64 is for ld only!).
+	    case "$qacflags$qaldflags$qalibs" in
+	    '');;
+	    *) ccflags="$ccflags $qacflags"
+	       ldflags="$ldflags $qacflags"
+	       lddlflags="$qaldflags $lddlflags"
+	       libswanted="$libswanted $qalibs"
+	       ;;
+	    esac
+	    case "$ccflags" in
+	    *-DUSE_64_BIT_ALL*) ;;
+      	    *) ccflags="$ccflags -DUSE_64_BIT_ALL";;
+	    esac
+	    case "$archname64" in
+	    ''|64*) archname64=64all ;;
+	    esac
+	    longsize="8"
+	    # Don't try backwards compatibility
+	    bincompat="$undef"
+	    d_bincompat5005="$undef"
+	    qacflags=''
+	    qaldflags=''
+	    qalibs=''
+	    qacpuwidth=''
 	    ;;
 esac
 EOCBU
+
+cat > UU/uselongdouble.cbu <<'EOCBU'
+# This script UU/uselongdouble.cbu will get 'called-back' by Configure 
+# after it has prompted the user for whether to use long doubles.
+case "$uselongdouble" in
+$define|true|[yY]*)
+        # -qlongdouble for cc taken out on 20010522 cause it
+        # causes more trouble than it does any good --hmb
+        d_Gconvert='sprintf((b),"%.*llg",((int)(n)),(x))'
+	;;
+esac
+EOCBU
+
+if test $usenativedlopen = 'true'
+then
+    ccflags="$ccflags -DUSE_NATIVE_DLOPEN"
+    case "$cc" in
+      *gcc*) ldflags="$ldflags -Wl,-brtl" ;;
+      *)     ldflags="$ldflags -brtl" ;;
+      esac
+else
+    case `oslevel` in
+	4.2.*)	;;	# libC_r has broke gettimeofday
+        *)  # If the C++ libraries, libC and libC_r, are available we will
+	    # prefer them over the vanilla libc, because the libC contain
+	    # loadAndInit() and terminateAndUnload() which work correctly
+	    # with C++ statics while libc load() and unload() do not. See
+	    # ext/DynaLoader/dl_aix.xs. The C-to-C_r switch is done by
+	    # usethreads.cbu, if needed.
+	    if test -f /lib/libC.a -a X"`$cc -v 2>&1 | grep gcc`" = X; then
+		# Cify libswanted.
+		set `echo X "$libswanted "| sed -e 's/ c / C c /'`
+		shift
+		libswanted="$*"
+		# Cify lddlflags.
+		set `echo X "$lddlflags "| sed -e 's/ -lc / -lC -lc /'`
+		shift
+		lddlflags="$*"
+	    fi
+	esac
+fi
+
+# EOF