Re: Linux glibc 2.2.90 issue; likely from readonly stdio mmap

Message-ID: <Pine.SOL.4.10.10205301008040.22885-100000@maxwell.phys.lafayette.edu>

p4raw-id: //depot/perl@16887

diff --git a/hints/linux.sh b/hints/linux.sh
index 7dccc1c..2b6e5d5 100644 (file)
--- a/hints/linux.sh
+++ b/hints/linux.sh
@@ -56,6 +56,33 @@ if test -L /lib/libc.so.6; then
     libc=/lib/$libc
 fi
 
+# glibc 2.2.90 and above apparently change stdio streams so Perl's
+# direct buffer manipulation no longer works.  The Configure tests
+# should be changed to correctly detect this, but until then,
+# the following check should at least let perl compile and run.
+# (This quick fix should be updated before 5.8.1.)
+# Since we just computed libc above, we'll use it here.  A typical 
+# value looks like libc='/lib/libc-2.0.6.so'
+# To be defensive, reject all unknown versions > 2.2.9.
+# A. Dougherty, May. 30, 2001
+case "$libc" in
+*-2.[01]*)  ;;
+*-2.2.so) ;;
+*-2.2.[0-9].*) ;;
+*)  # Honor a command-line override
+    if test -z "$d_stdstdio"; then
+       d_stdstdio="$undef"
+       cat <<'EOM' >&4
+
+Disabling perl's stdio buffer snooping.  This will generate a harmless
+           *** WHOA THERE!!! ***
+message in Configure.  Accept the recommended value.
+Read hints/linux.sh for further information.
+EOM
+    fi
+    ;;
+esac
+
 # Configure may fail to find lstat() since it's a static/inline
 # function in <sys/stat.h>.
 d_lstat=define