+case "$isgcc" in
+gcc) ;;
+*) case "$optimize" in
+ *-O*) # With both -O and -g, the -g must be -g3.
+ optimize="`echo $optimize | sed 's/-g[1-4]*/-g3/'`"
+ ;;
+ esac
+ ;;
+esac
+
+## Optimization limits
+case "$isgcc" in
+gcc) # gcc 3.2.1 wants a lot of memory for -O3'ing toke.c
+cat >try.c <<EOF
+#include <stdio.h>
+#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 $maxdsiz MB, which is (sadly) not
+always enough to fully optimize some source code files of Perl,
+at least 256 MB seems to be necessary as of Perl 5.8.0. I'll try to
+use a lower optimization level for those parts. You could either try
+using your shell's ulimit/limit/limits command to raise your datasize
+(assuming the system-wide hard resource limits allow you to go higher),
+or if you can't go higher and if you are a sysadmin, and you *do* want
+the full optimization, you can tune the 'max_per_proc_data_size'
+kernel parameter: see man sysconfigtab, and man sys_attrs_proc.
+
+EOM
+toke_cflags='optimize=-O2'
+ fi
+;;
+esac
+
+# The patch 23787
+# http://perl5.git.perl.org/perl.git/commit/73cb726371990cd489597c4fee405a9815abf4da
+# broke things for gcc (at least gcc 3.3) so that many of the pack()
+# checksum tests for formats L, j, J, especially when combined
+# with the < and > specifiers, started to fail if compiled with plain -O3.
+case "$isgcc" in
+gcc)
+pp_pack_cflags='optimize="-O3 -fno-cse-skip-blocks"'
+;;
+esac
+
+# we want dynamic fp rounding mode, and we want ieee exception semantics
+case "$isgcc" in
+gcc) ccflags="$ccflags -mfp-rounding-mode=d -mieee" ;;
+*) case "$_DEC_cc_style" in
+ new) ccflags="$ccflags -fprm d -ieee" ;;
+ esac
+ ;;
+esac
+