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    Subject[PATCH 4/4] localmodconfig: Add debug environment variable LOCALMODCONFIG_DEBUG
    From: Steven Rostedt <srostedt@redhat.com>

    If the environment variable LOCALMODCONFIG_DEBUG is set, then debug output
    will appear in the make localmodconfig. This will simplify debugging what
    people get with their output, as I can just tell people to do:

    LOCALMODCONFIG_DEBUG=1 make localmodconfig 2>out.txt

    and have them send me the out.txt. I'll be able to see why things are not
    working as they think it should be.

    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
    ---
    scripts/kconfig/streamline_config.pl | 21 +++++++++++++++++++++
    1 file changed, 21 insertions(+)

    diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
    index fcfcb30..2fbbbc1 100644
    --- a/scripts/kconfig/streamline_config.pl
    +++ b/scripts/kconfig/streamline_config.pl
    @@ -45,6 +45,16 @@
    use strict;
    use Getopt::Long;

    +# set the environment variable LOCALMODCONFIG_DEBUG to get
    +# debug output.
    +my $debugprint = 0;
    +$debugprint = 1 if (defined($ENV{LOCALMODCONFIG_DEBUG}));
    +
    +sub dprint {
    + return if (!$debugprint);
    + print STDERR @_;
    +}
    +
    my $config = ".config";

    my $uname = `uname -r`;
    @@ -389,6 +399,7 @@ foreach my $module (keys(%modules)) {
    my @arr = @{$objects{$module}};
    foreach my $conf (@arr) {
    $configs{$conf} = $module;
    + dprint "$conf added by direct ($module)\n";
    }
    } else {
    # Most likely, someone has a custom (binary?) module loaded.
    @@ -412,6 +423,8 @@ foreach my $line (@config_file) {

    my $repeat = 1;

    +my $depconfig;
    +
    #
    # Note, we do not care about operands (like: &&, ||, !) we want to add any
    # config that is in the depend list of another config. This script does
    @@ -440,6 +453,7 @@ sub parse_config_depends
    # We must make sure that this config has its
    # dependencies met.
    $repeat = 1; # do again
    + dprint "$conf selected by depend $depconfig\n";
    $configs{$conf} = 1;
    }
    } else {
    @@ -473,15 +487,18 @@ sub parse_config_selects

    # Make sure that this config exists in the current .config file
    if (!defined($orig_configs{$conf})) {
    + dprint "$conf not set for $config select\n";
    next;
    }

    # Check if something other than a module selects this config
    if (defined($orig_configs{$conf}) && $orig_configs{$conf} ne "m") {
    + dprint "$conf (non module) selects config, we are good\n";
    # we are good with this
    return;
    }
    if (defined($configs{$conf})) {
    + dprint "$conf selects $config so we are good\n";
    # A set config selects this config, we are good
    return;
    }
    @@ -506,6 +523,7 @@ sub parse_config_selects
    $repeat = 1;
    # Make this config need to be selected
    $configs{$next_config} = 1;
    + dprint "$next_config selected by select $config\n";
    }

    my %process_selects;
    @@ -526,6 +544,7 @@ sub loop_depend {
    }

    $config =~ s/^CONFIG_//;
    + $depconfig = $config;

    if (defined($depends{$config})) {
    # This config has dependencies. Make sure they are also included
    @@ -546,6 +565,8 @@ sub loop_select {
    foreach my $config (keys %process_selects) {
    $config =~ s/^CONFIG_//;

    + dprint "Process select $config\n";
    +
    # config has no prompt and must be selected.
    parse_config_selects $config, $selects{$config};
    }
    --
    1.7.10

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