From: "P. J. McDermott" <pjm@nac.net>
Description: Add strtonum() to generated conftest.awk
 conftest.awk uses the strtonum() function of GNU Awk to check for a linker that
 supports the "-z relro" option.
 .
 This patch adds the pure awk implementation of strtonum() found in
 awklib/eg/lib/strtonum.awk in GNU Awk to enable conftest.awk to run on other
 awk implementations.

diff -Naur src.orig/libc/configure src/libc/configure
--- src.orig/libc/configure	2012-12-02 16:11:45.000000000 -0500
+++ src/libc/configure	2013-06-20 20:13:34.122952650 -0400
@@ -6383,14 +6383,52 @@
 
 _ACEOF
   cat > conftest.awk <<\EOF
+# mystrtonum --- convert string to number
+# Arnold Robbins, arnold@skeeve.com, Public Domain
+# February, 2004
+function mystrtonum(str,        ret, chars, n, i, k, c)
+{
+    if (str ~ /^0[0-7]*$/) {
+        # octal
+        n = length(str)
+        ret = 0
+        for (i = 1; i <= n; i++) {
+            c = substr(str, i, 1)
+            if ((k = index("01234567", c)) > 0)
+                k-- # adjust for 1-basing in awk
+            ret = ret * 8 + k
+        }
+    } else if (str ~ /^0[xX][[:xdigit:]]+/) {
+        # hexadecimal
+        str = substr(str, 3)    # lop off leading 0x
+        n = length(str)
+        ret = 0
+        for (i = 1; i <= n; i++) {
+            c = substr(str, i, 1)
+            c = tolower(c)
+            if ((k = index("0123456789", c)) > 0)
+                k-- # adjust for 1-basing in awk
+            else if ((k = index("abcdef", c)) > 0)
+                k += 9
+            ret = ret * 16 + k
+        }
+    } else if (str ~ \
+  /^[-+]?([0-9]+([.][0-9]*([Ee][0-9]+)?)?|([.][0-9]+([Ee][-+]?[0-9]+)?))$/) {
+        # decimal number, possibly floating point
+        ret = str + 0
+    } else
+        ret = "NOT-A-NUMBER"
+
+    return ret
+}
 BEGIN {
   result = "no"
-  commonpagesize = strtonum(commonpagesize)
+  commonpagesize = mystrtonum(commonpagesize)
 }
 { print "LINE:", $0 > "/dev/stderr" }
 $1 == "GNU_RELRO" {
-  vaddr = strtonum($3)
-  memsz = strtonum($6)
+  vaddr = mystrtonum($3)
+  memsz = mystrtonum($6)
   end = vaddr + memsz
   printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
     vaddr, memsz, end, commonpagesize > "/dev/stderr"
diff -Naur src.orig/libc/configure.in src/libc/configure.in
--- src.orig/libc/configure.in	2012-12-02 16:11:45.000000000 -0500
+++ src/libc/configure.in	2013-06-20 20:13:42.351194464 -0400
@@ -1475,14 +1475,52 @@
 int data[0x10000] = { 1, };
 ]])])
   cat > conftest.awk <<\EOF
+# mystrtonum --- convert string to number
+# Arnold Robbins, arnold@skeeve.com, Public Domain
+# February, 2004
+function mystrtonum(str,        ret, chars, n, i, k, c)
+{
+    if (str ~ /^0[0-7]*$/) {
+        # octal
+        n = length(str)
+        ret = 0
+        for (i = 1; i <= n; i++) {
+            c = substr(str, i, 1)
+            if ((k = index("01234567", c)) > 0)
+                k-- # adjust for 1-basing in awk
+            ret = ret * 8 + k
+        }
+    } else if (str ~ /^0[xX][[:xdigit:]]+/) {
+        # hexadecimal
+        str = substr(str, 3)    # lop off leading 0x
+        n = length(str)
+        ret = 0
+        for (i = 1; i <= n; i++) {
+            c = substr(str, i, 1)
+            c = tolower(c)
+            if ((k = index("0123456789", c)) > 0)
+                k-- # adjust for 1-basing in awk
+            else if ((k = index("abcdef", c)) > 0)
+                k += 9
+            ret = ret * 16 + k
+        }
+    } else if (str ~ \
+  /^[-+]?([0-9]+([.][0-9]*([Ee][0-9]+)?)?|([.][0-9]+([Ee][-+]?[0-9]+)?))$/) {
+        # decimal number, possibly floating point
+        ret = str + 0
+    } else
+        ret = "NOT-A-NUMBER"
+
+    return ret
+}
 BEGIN {
   result = "no"
-  commonpagesize = strtonum(commonpagesize)
+  commonpagesize = mystrtonum(commonpagesize)
 }
 { print "LINE:", $0 > "/dev/stderr" }
 $1 == "GNU_RELRO" {
-  vaddr = strtonum($3)
-  memsz = strtonum($6)
+  vaddr = mystrtonum($3)
+  memsz = mystrtonum($6)
   end = vaddr + memsz
   printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
     vaddr, memsz, end, commonpagesize > "/dev/stderr"