--- configure.orig	2024-01-29 15:53:31 UTC
+++ configure
@@ -4198,9 +4198,10 @@ printf "%s\n" "$as_me: LIBS note: LIBS should only be 
       -I*)
         xc_bad_var_ldflags=yes
         ;;
-      -l* | --library=*)
-        xc_bad_var_ldflags=yes
-        ;;
+# Temporarily disable -l* flag check for SSP support (Mk/bsd.ssp.mk)
+#      -l* | --library=*)
+#        xc_bad_var_ldflags=yes
+#        ;;
     esac
   done
   if test $xc_bad_var_ldflags = yes; then
@@ -4270,9 +4271,10 @@ printf "%s\n" "$as_me: $xc_bad_var_msg libraries. Use 
   xc_bad_var_cflags=no
   for xc_word in $CFLAGS; do
     case "$xc_word" in
-      -D*)
-        xc_bad_var_cflags=yes
-        ;;
+# Temporarily disable -D* flag check (PR/177401, PR/180944)
+#      -D*)
+#        xc_bad_var_cflags=yes
+#        ;;
       -U*)
         xc_bad_var_cflags=yes
         ;;
@@ -17400,7 +17402,7 @@ printf "%s\n" "$as_me: WARNING: failed to figure out c
   flags_dbg_yes="unknown"
   flags_opt_all="unknown"
   flags_opt_yes="unknown"
-  flags_opt_off="unknown"
+  flags_opt_off=""
   #
   flags_prefer_cppflags="no"
   #
@@ -17505,7 +17507,7 @@ printf "%s\n" "yes" >&6; }
     flags_dbg_yes="-g2"
     flags_opt_all="-O -O0 -O1 -O2 -O3 -O4"
     flags_opt_yes="-O1"
-    flags_opt_off="-O0"
+    flags_opt_off=""
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -17566,7 +17568,7 @@ printf "%s\n" "yes" >&6; }
     flags_dbg_yes="-g"
     flags_opt_all="-O +O0 +O1 +O2 +O3 +O4"
     flags_opt_yes="+O2"
-    flags_opt_off="+O0"
+    flags_opt_off=""
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -17634,7 +17636,7 @@ printf "%s\n" "yes" >&6; }
     flags_opt_all="$flags_opt_all -qoptimize=4"
     flags_opt_all="$flags_opt_all -qoptimize=5"
     flags_opt_yes="-O2"
-    flags_opt_off="-qnooptimize"
+    flags_opt_off=""
     flags_prefer_cppflags="yes"
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
@@ -17747,13 +17749,13 @@ rm -f conftest.err conftest.i conftest.$ac_ext
       flags_dbg_yes="-g"
       flags_opt_all="-O -O0 -O1 -O2 -O3 -Os"
       flags_opt_yes="-O2"
-      flags_opt_off="-O0"
+      flags_opt_off=""
     else
       compiler_id="INTEL_WINDOWS_C"
       flags_dbg_yes="/Zi /Oy-"
       flags_opt_all="/O /O0 /O1 /O2 /O3 /Od /Og /Og- /Oi /Oi-"
       flags_opt_yes="/O2"
-      flags_opt_off="/Od"
+      flags_opt_off=""
     fi
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
@@ -17905,7 +17907,7 @@ printf "%s\n" "clang '$compiler_num' (raw: '$fullclang
     flags_dbg_yes="-g"
     flags_opt_all="-O -O0 -O1 -O2 -Os -O3 -O4"
     flags_opt_yes="-O2"
-    flags_opt_off="-O0"
+    flags_opt_off=""
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -17980,7 +17982,7 @@ printf "%s\n" "gcc '$compiler_num' (raw: '$gccver')" >
     flags_dbg_yes="-g"
     flags_opt_all="-O -O0 -O1 -O2 -O3 -Os -Og -Ofast"
     flags_opt_yes="-O2"
-    flags_opt_off="-O0"
+    flags_opt_off=""
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -18241,7 +18243,7 @@ printf "%s\n" "yes" >&6; }
     flags_dbg_yes="-g"
     flags_opt_all="-O -O0 -O1 -O2 -O3 -Ofast"
     flags_opt_yes="-O2"
-    flags_opt_off="-O0"
+    flags_opt_off=""
   else
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
 printf "%s\n" "no" >&6; }
@@ -18822,6 +18824,8 @@ printf "%s\n" "$honor_optimize_option" >&6; }
     #
     if test "$honor_optimize_option" = "yes"; then
 
+# Do not remove the user-supplied optimization flags in CFLAGS/CPPFLAGS (PR/150854)
+if false; then
     ac_var_stripped=""
   for word1 in $tmp_CFLAGS; do
     ac_var_strip_word="no"
@@ -18852,6 +18856,7 @@ printf "%s\n" "$honor_optimize_option" >&6; }
   done
     tmp_CPPFLAGS="$ac_var_stripped"
   squeeze tmp_CPPFLAGS
+fi
 
       if test "$want_optimize" = "yes"; then
         { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if compiler accepts optimizer enabling options" >&5
@@ -45884,9 +45889,10 @@ printf "%s\n" "$as_me: LIBS note: LIBS should only be 
       -I*)
         xc_bad_var_ldflags=yes
         ;;
-      -l* | --library=*)
-        xc_bad_var_ldflags=yes
-        ;;
+# Temporarily disable -l* flag check for SSP support (Mk/bsd.ssp.mk)
+#      -l* | --library=*)
+#        xc_bad_var_ldflags=yes
+#        ;;
     esac
   done
   if test $xc_bad_var_ldflags = yes; then
@@ -45956,9 +45962,10 @@ printf "%s\n" "$as_me: $xc_bad_var_msg libraries. Use 
   xc_bad_var_cflags=no
   for xc_word in $CFLAGS; do
     case "$xc_word" in
-      -D*)
-        xc_bad_var_cflags=yes
-        ;;
+# Temporarily disable -D* flag check (PR/177401, PR/180944)
+#      -D*)
+#        xc_bad_var_cflags=yes
+#        ;;
       -U*)
         xc_bad_var_cflags=yes
         ;;