build: Replace cltostr.pl by a shell script

This avoids a dependency on Perl to build OpenCL support.

Makefile

@@ -137,7 +137,7 @@ endif
 
 ifeq ($(HAVE_OPENCL),yes)
 common/oclobj.h: common/opencl/x264-cl.h $(wildcard $(SRCPATH)/common/opencl/*.cl)
-	cat $^ | perl $(SRCPATH)/tools/cltostr.pl x264_opencl_source > $@
+	cat $^ | $(SRCPATH)/tools/cltostr.sh $@
 GENERATED += common/oclobj.h
 SRCS += common/opencl.c encoder/slicetype-cl.c
 endif

configure

@@ -1046,15 +1046,6 @@ ASFLAGS="$ASFLAGS -DBIT_DEPTH=$bit_depth"
 libdl=""
 if [ "$opencl" = "yes" ]; then
     opencl="no"
-    log_check "for perl"
-    output=$(perl -v)
-    if [ "$output" = "" ]; then
-        log_fail
-        echo 'OpenCL support requires perl to compile.'
-        echo 'use --disable-opencl to compile without OpenCL.'
-        exit 1
-    fi
-    log_ok
     # cygwin can use opencl if it can use LoadLibrary
     if [ $SYS = WINDOWS ] || ([ $SYS = CYGWIN ] && cc_check windows.h "" "LoadLibraryW(0);") ; then
         opencl="yes"

tools/cltostr.pl

-# Perl script used for compiling OpenCL src into x264 binary
-#
-# Copyright (C) 2013-2014 x264 project
-# Authors: Steve Borho <sborho@multicorewareinc.com>
-
-use Digest::MD5 qw(md5_hex);
-
-# xxd takes a VAR, which will be the variable name
-# and BYTES, a string of bytes to beencoded.
-sub xxd
-{
-  my %args = @_;
-  my $var = $args{VAR};
-  my $bytes = $args{BYTES};
-  my @hexbytes;
-  my @bytes = split //, $$bytes;
-  foreach $b (@bytes)
-  {
-    push @hexbytes, sprintf("0x%02X", ord($b));
-  }
-
-  # Format 'em nice and pretty-like.
-  print 'static const char ' . $var . '[] = {' . "\n";
-  my $count = 0;
-  foreach my $h (@hexbytes)
-  {
-    print "$h, ";
-    $count++;
-    if ($count == 16)
-    {
-      print "\n";
-      $count = 0;
-    }
-  }
-  print "\n0x00 };\n\n";
-
-  return;
-}
-
-if (@ARGV < 1)
-{
-  printf "%s: VARNAME ", $0 . "\n";
-  exit(-1);
-}
-
-
-my @lines;
-while(<STDIN>)
-{
-  s/^\s+//;                # trim leading whitespace
-  if (/^\/\//)
-  {
-    next;   # skip the line if it starts with '//'
-  }
-  push @lines, $_;
-}
-
-my $lines = join '', @lines;
-xxd(VAR => @ARGV[0], BYTES => \$lines);
-
-my $hash = md5_hex($lines);
-@hash = ( $hash =~ m/../g );
-
-
-xxd(VAR => @ARGV[0] . "_hash", BYTES => \$hash);

tools/cltostr.sh

+#!/bin/sh
+# Convert standard input to a C char array, write to a file, then create an
+# MD5 sum of that file and append said MD5 sum as char array to the file.
+
+FILE=$1
+
+# Filter out whitespace, empty lines, and comments.
+sanitize() {
+    sed 's/^[[:space:]]*//; /^$/d; /^\/\//d'
+}
+
+# Convert stdin to a \0-terminated char array.
+dump() {
+    printf 'static const char %s[] = {\n' $1
+    od -v -A n -t x1 | sed 's/.\(..\)/0x\1, /g'
+    printf '0x00 };\n'
+}
+
+# Print MD5 hash w/o newline character to not embed the character in the array.
+hash() {
+    # md5sum is not standard, so try different platform-specific alternatives.
+    { md5sum $1 2> /dev/null || md5 -q $1 || digest -a md5 $1; } |
+        cut -b -32 | tr -d '\n\r'
+}
+
+trap "rm -f $FILE.temp" EXIT
+
+sanitize | tee $FILE.temp |
+    dump x264_opencl_source > $FILE
+
+hash $FILE.temp |
+    dump x264_opencl_source_hash >> $FILE