Fix most Compiler warnings seen in buildbot.

Add suppressions for a few warnings that cannot be meaningfully fixed by
MariaDB developers.

Changes for XtraDB, PBXT, and YaSSL also submitted upstream.

Also add a `ccfilter` wrapper that can be used to filter out suppressed warnings in a
local build (to check that new warnings are not introduced).


client/mysqlbinlog.cc:
  Fix compiler warnings.
config/ac-macros/misc.m4:
  Fix wrong naming, autoconfig requires _cv_ in cached names.
extra/yassl/include/yassl_int.hpp:
  Fix compiler warnings.
extra/yassl/src/handshake.cpp:
  Fix compiler warnings.
extra/yassl/src/yassl_imp.cpp:
  Fix compiler warnings.
extra/yassl/src/yassl_int.cpp:
  Fix compiler warnings.
extra/yassl/taocrypt/include/modes.hpp:
  Fix compiler warnings.
extra/yassl/taocrypt/src/asn.cpp:
  Fix compiler warnings.
mysys/my_compress.c:
  Fix compiler warnings.
sql/mysqld.cc:
  Fix compiler warnings.
sql/strfunc.cc:
  Fix compiler warnings.
storage/pbxt/src/discover_xt.cc:
  Fix compiler warnings.
storage/xtradb/fil/fil0fil.c:
  Fix compiler warnings.
storage/xtradb/mtr/mtr0mtr.c:
  Fix compiler warnings.
storage/xtradb/srv/srv0srv.c:
  Fix compiler warnings.
storage/xtradb/srv/srv0start.c:
  Fix compiler warnings.
strings/decimal.c:
  Fix compiler warnings.
support-files/ccfilter:
  Add helper for suppressing compiler warnings in local developer source tree.
      
  Allows to check for not introducing new warnings into Buildbot without having to actually
  run the build through Buildbot.
support-files/compiler_warnings.supp:
  Suppress a few warnings that cannot be meaningfully fixed in source code.

2 files changed, 124 insertions, 0 deletions

diff --git a/support-files/ccfilter b/support-files/ccfilter
new file mode 100644
index 00000000000..e2957cd3228
--- /dev/null
+++ b/support-files/ccfilter
@@ -0,0 +1,104 @@
+#! /usr/bin/perl
+
+# Post-processor for compiler output to filter out warnings matched in
+# support-files/compiler_warnings.supp. This makes it easier to check
+# that no new warnings are introduced without needing to submit a build
+# for Buildbot.
+#
+# Use by setting CC="ccfilter gcc" CXX="ccfilter gcc" before ./configure.
+#
+# By default, just filters the output for suppressed warnings. If the
+# FAILONWARNING environment variable is set, then instead will fail the
+# compile on encountering a non-suppressed warnings.
+
+use strict;
+use warnings;
+
+my $suppressions;
+
+open STDOUT_COPY, ">&STDOUT"
+    or die "Failed to dup stdout: $!]n";
+
+my $pid= open(PIPE, '-|');
+
+if (!defined($pid)) {
+  die "Error: Cannot fork(): $!\n";
+} elsif (!$pid) {
+  # Child.
+  # actually want to send the STDERR to the parent, not the STDOUT.
+  # So shuffle things around a bit.
+  open STDERR, ">&STDOUT"
+      or die "Child: Failed to dup pipe to parent: $!\n";
+  open STDOUT, ">&STDOUT_COPY"
+      or die "Child: Failed to dup parent stdout: $!\n";
+  close STDOUT_COPY;
+  exec { $ARGV[0] } @ARGV;
+  die "Child: exec() failed: $!\n";
+} else {
+  # Parent.
+  close STDOUT_COPY;
+  my $cwd= qx(pwd);
+  chomp($cwd);
+  while (<PIPE>) {
+    my $line= $_;
+    if (/^(.*?):([0-9]+): [Ww]arning: (.*)$/) {
+      my ($file, $lineno, $msg)= ($1, $2, $3);
+      $file= "$cwd/$file";
+
+      next
+          if check_if_suppressed($file, $lineno, $msg);
+      die "$line\nGot warning, terminating.\n"
+          if $ENV{FAILONWARNING};
+      print STDERR $line;
+      next;
+    }
+
+    print STDERR $line;
+  }
+  close(PIPE);
+}
+
+exit 0;
+
+sub check_if_suppressed {
+  my ($file, $lineno, $msg)= @_;
+  load_suppressions() unless defined($suppressions);
+  for my $s (@$suppressions) {
+    my ($file_re, $msg_re, $start, $end)= @$s;
+    if ($file =~ /$file_re/ &&
+        $msg =~ /$msg_re/ &&
+        (!defined($start) || $start <= $lineno) &&
+        (!defined($end) || $end >= $lineno)) {
+      return 1;
+    }
+  }
+  return undef;
+}
+
+sub load_suppressions {
+  # First find the suppressions file, might be we need to move up to
+  # the base directory.
+  my $path = "support-files/compiler_warnings.supp";
+  my $exists;
+  for (1..10) {
+    $exists= -f $path;
+    last if $exists;
+    $path= '../'. $path;
+  }
+  die "Error: Could not find suppression file (out of source dir?).\n"
+      unless $exists;
+
+  $suppressions= [];
+  open "F", "<", $path
+      or die "Error: Could not read suppression file '$path': $!\n";
+  while (<F>) {
+    # Skip comment and empty lines.
+    next if /^\s*(\#.*)?$/;
+    die "Invalid syntax in suppression file '$path', line $.:\n$_"
+        unless /^\s*(.+?)\s*:\s*(.+?)\s*(?:[:]\s*([0-9]+)(?:-([0-9]+))?\s*)?$/;
+    my ($file_re, $line_re, $start, $end)= ($1, $2, $3, $4);
+    $end = $start
+        if defined($start) && !defined($end);
+    push @$suppressions, [$file_re, $line_re, $start, $end];
+  }
+}
diff --git a/support-files/compiler_warnings.supp b/support-files/compiler_warnings.supp
index fbe4b3d21c9..535b8666ec1 100644
--- a/support-files/compiler_warnings.supp
+++ b/support-files/compiler_warnings.supp
@@ -25,6 +25,9 @@ sql_yacc.cc : .*switch statement contains 'default' but no 'case' labels.*
 pars0grm.tab.c: .*'yyerrorlab' : unreferenced label.*
 _flex_tmp.c: .*not enough actual parameters for macro 'yywrap'.*
 pars0lex.l: .*conversion from 'ulint' to 'int', possible loss of data.*
+btr/btr0cur\.c: .*value computed is not used.*: 3175-3375
+include/buf0buf\.ic: unused parameter ‘mtr’
+fil/fil0fil\.c: comparison between signed and unsigned : 3100-3199
 
 #
 # bdb is not critical to keep up to date
@@ -41,6 +44,12 @@ db_vrfy.c : .*comparison is always false due to limited range of data type.*
 .*/cmd-line-utils/readline/.* : .*
 
 #
+# Ignore some warnings in libevent, which is not maintained by us.
+#
+.*/extra/libevent/.* : .*unused parameter.*
+.*/extra/libevent/select\.c : .*comparison between signed and unsigned.* : 270-280
+
+#
 # Ignore all conversion warnings on windows 64
 # (Is safe as we are not yet supporting strings >= 2G)
 #
@@ -75,6 +84,17 @@ db_vrfy.c : .*comparison is always false due to limited range of data type.*
 storage/maria/ma_pagecache.c: .*'info_check_pin' defined but not used
 
 #
+# I think these are due to mix of C and C++.
+#
+storage/pbxt/ : typedef.*was ignored in this declaration
+
+
+#
+# Groff warnings on OpenSUSE.
+#
+.*/dbug/.*(groff|<standard input>) : .*
+
+#
 # Unexplanable (?) stuff
 #
 listener.cc : .*conversion from 'SOCKET' to 'int'.*