Tru64, gcc -O3, datasize

[perl5.git] / hints / dec_osf.sh

diff --git a/hints/dec_osf.sh b/hints/dec_osf.sh
index dcaa283..8cf54b1 100644 (file)
--- a/hints/dec_osf.sh
+++ b/hints/dec_osf.sh
@@ -69,13 +69,16 @@ esac
        # reset
        _DEC_cc_style=
 case "$isgcc" in
-gcc)   _gcc_version=`$cc --version 2>&1 | tr . ' '`
-       set $_gcc_version
-       if test "$1" -lt 2 -o \( "$1" -eq 2 -a \( "$2" -lt 95 -o \( "$2" -eq 95 -a "$3" -lt 2 \) \) \); then
+gcc)   if [ "X$gccversion" = "X" ]; then
+           # Done too late in Configure if hinted
+           gccversion=`$cc --version | sed 's/.*(GCC) *//'`
+       fi
+       set $gccversion
+       if test "$1" -lt 2 -o \( "$1" -eq 2 -a \( "$2" -lt 95 -o \( "$2" -eq 95 -a "$3" -lt 3 \) \) \); then
            cat >&4 <<EOF
 
-*** Your cc seems to be gcc and its version ($_gcc_version) seems to be
-*** less than 2.95.2.  This is not a good idea since old versions of gcc
+*** Your cc seems to be gcc and its version ($gccversion) seems to be
+*** less than 2.95.3.  This is not a good idea since old versions of gcc
 *** are known to produce buggy code when compiling Perl (and no doubt for
 *** other programs, too).
 ***
@@ -145,6 +148,42 @@ case "$optimize" in
        ;;
 esac
 
+## Optimization limits
+case "$isgcc" in
+gcc) #  gcc 3.2.1 wants a lot of memory for -O3'ing toke.c
+cat >try.c <<EOF
+#include <sys/resource.h>
+
+int main ()
+{
+    struct rlimit rl;
+    int i = getrlimit (RLIMIT_DATA, &rl);
+    printf ("%d\n", rl.rlim_cur / (1024 * 1024));
+    } /* main */
+EOF
+$cc -o try $ccflags $ldflags try.c
+       maxdsiz=`./try`
+rm -f try try.c core
+if [ $maxdsiz -lt 256 ]; then
+    # less than 256 MB is probably not enough to optimize toke.c with gcc -O3
+    cat <<EOM >&4
+
+Your process datasize is limited to $maxdsiz MB, which is (sadly) not
+always enough to fully optimize some source code files of Perl,
+at least 256 MB seems to be necessary as of Perl 5.8.0.  I'll try to
+use a lower optimization level for those parts.  You could either try
+using your shell's ulimit/limit/limits command to raise your datasize
+(assuming the system-wide hard resource limits allow you to go higher),
+or if you can't go higher and if you are a sysadmin, and you *do* want
+the full optimization, you can tune the 'max_per_proc_data_size'
+kernel parameter: see man sysconfigtab, and man sys_attrs_proc.
+
+EOM
+toke_cflags='optimize=-O2'
+    fi
+;;
+esac
+
 # we want dynamic fp rounding mode, and we want ieee exception semantics
 case "$isgcc" in
 gcc)   ;;
@@ -310,6 +349,41 @@ Cannot continue, aborting.
 EOF
                exit 1
                ;;
+       *)
+               # Test whether libc's been fixed yet.
+               cat >try.c <<\TRY
+#include <stdio.h>
+int main(int argc, char **argv)
+{
+       unsigned long uvmax = ~0UL;
+       long double ld = uvmax + 0.0L;
+       char buf1[30], buf2[30];
+
+       (void) sprintf(buf1, "%lu", uvmax);
+       (void) sprintf(buf2, "%.0Lf", ld);
+       return strcmp(buf1, buf2) != 0;
+}
+TRY
+               # Don't bother trying to work with Configure's idea of
+               # cc and the various flags.  This might not work as-is
+               # with gcc -- but we're testing libc, not the compiler.
+               if cc -o try -std try.c && ./try
+               then
+                       : ok
+               else
+                       cat <<\UGLY >&4
+!
+Warning!  Your libc has not yet been patched so that its "%Lf" format for
+printing long doubles shows all the significant digits.  You will get errors
+in the t/op/numconvert test because of this.  (The data is still good
+internally, and the "%e" format of printf() or sprintf() in perl will still
+produce valid results.)  See README.tru64 for additional details.
+
+Continuing anyway.
+!
+UGLY
+               fi
+               $rm -f try try.c
        esac
        ;;
 esac
@@ -319,33 +393,21 @@ case "`/usr/sbin/sizer -v`" in
 *[1-4].0*) d_modfl=undef ;; # must wait till 5.0
 esac
 
-case "$loclibpth" in
-'')    ;;
-*)
-       needusrshlib=''
-       for p in $loclibpth
-       do
-           if test -n "`ls $p/libdb.so* 2>/dev/null`"; then
-               needusrshlib=yes
-           fi
-           if test -d $p; then
-               echo "Appending $p to LD_LIBRARY_PATH." >& 4
-               case "$LD_LIBRARY_PATH" in
-               '') LD_LIBRARY_PATH=$p                  ;;
-               *)  LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$p ;;
-               esac
-           fi  
-       done
-       echo "LD_LIBRARY_PATH is now $LD_LIBRARY_PATH." >& 4
-       # This is evil but I can't think of a nice workaround:
-       # the /usr/shlib/libdb.so needs to be seen first,
-       # or running Configure will fail.
-       if test -n "$needusrshlib"; then
-           echo "Prepending /usr/shlib to loclibpth." >& 4
-           loclibpth="/usr/shlib $loclibpth"
-           echo "loclibpth is now $loclibpth." >& 4
-       fi
-       ;;
+# Keep that leading tab.
+       old_LD_LIBRARY_PATH=$LD_LIBRARY_PATH
+for p in $loclibpth
+do
+       if test -d $p; then
+           echo "Appending $p to LD_LIBRARY_PATH." >& 4
+           case "$LD_LIBRARY_PATH" in
+           '') LD_LIBRARY_PATH=$p                  ;;
+           *)  LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$p ;;
+           esac
+       fi      
+done
+case "$LD_LIBRARY_PATH" in
+"$old_LD_LIBRARY_PATH") ;;
+*) echo "LD_LIBRARY_PATH is now $LD_LIBRARY_PATH." >& 4 ;;
 esac
 
 #