From c790707d517dbf4fa6a8b2695a35b3bc3b784556 Mon Sep 17 00:00:00 2001
From: Kaz Kylheku <kaz@kylheku.com>
Date: Thu, 3 Dec 2015 18:42:08 -0800
Subject: Configure for large file support.

* configure (lang_flags): _XOPEN_SOURCE is bumped from 600 to
700 so that fseeko and ftello are revealed in <stdio.h>
by glibc, and off_t is defined there too.
New configure tests for fseeko/ftello and for detecting
which macro, if any, do we add to lang_flags to enable
large file support (64 bit off_t).
---
 configure | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 70 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index d068496c..b63c7297 100755
--- a/configure
+++ b/configure
@@ -96,7 +96,7 @@ yacc='$(cross)$(tool_prefix)$(yaccname)'
 yacc_given=
 nm='$(cross)$(tool_prefix)nm'
 opt_flags=-O2
-lang_flags='-ansi -D_XOPEN_SOURCE=600'
+lang_flags='-ansi -D_XOPEN_SOURCE=700'
 diag_flags='-Wall -Werror=implicit-function-declaration -Werror=missing-prototypes -Werror=strict-prototypes'
 debug_flags=-g
 debug_only_flags=-DTXR_DEBUG
@@ -2335,6 +2335,75 @@ else
   printf "no\n"
 fi
 
+#
+# Do we have fseeko and ftello?
+#
+
+printf "Checking for fseeko and ftello ... "
+
+cat > conftest.c <<!
+#include <stdio.h>
+#include <sys/types.h>
+
+int main(int argc, char **argv)
+{
+  int res = fseeko(stdin, 0, SEEK_CUR);
+  off_t pos = ftello(stdin);
+  return 0;
+}
+!
+
+if conftest ; then
+  printf "yes\n"
+  printf "#define HAVE_FSEEKO 1\n" >> $config_h
+else
+  printf "no\n"
+fi
+
+printf "Checking how to enable 64 bit file offsets ... "
+
+file_offset_define=none
+
+for try in NOTHING _LARGE_FILES=1 _FILE_OFFSET_BITS=64 ; do
+  cat > conftest.c <<!
+#include <sys/types.h>
+char SIZEOF_OFF_T[sizeof (off_t)];
+char DUMMY;
+!
+  if ! conftest_syms VERBOSE=y EXTRA_FLAGS=-D$try ; then
+    printf "failed\n\n"
+
+    printf "Errors from compilation: \n\n"
+    cat conftest.err
+    exit 1
+  fi
+
+  SIZEOF_OFF_T=0
+
+  read_syms
+
+  if [ $SIZEOF_OFF_T -eq 0 ] ; then
+    printf "failed\n"
+    exit 1
+  fi
+
+  if [ $SIZEOF_OFF_T -eq 8 ] ; then
+    if [ $try = NOTHING ] ; then
+      printf "default\n"
+      file_offset_define=
+    else
+      printf -- "-D%s\n" $try
+      file_offset_define=$try
+    fi
+    break;
+  fi
+done
+
+if [ "$file_offset_define" = none ] ; then
+  printf "unable\n"
+elif [ -n "$file_offset_define" ] ; then
+  lang_flags="$lang_flags -D$file_offset_define"
+fi
 
 #
 # Dependent variables
-- 
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