Question

I’d like to have all the items in cflags automatically in cppflags. How do I? Following fail code:

my %conf = (
    'cflags'   => ['-g', '-O0'],
    'cppflags' => [ @{$conf{cflags}} ],
    'bindir'   => $PWD . "/bin",
);

Sorry for the silly question, I’m new to perl :P.

Answer 1

You’re still building the list to assign to %conf, so nothing’s been assigned to %conf yet, so trying to read from $conf{cflags} is going to be fruitless.

Option 1:

my @cflags = qw( -g -O0 );
my %conf = (
    cflags   => [ @cflags ],
    cppflags => [ @cflags ],
    bindir   => "$PWD/bin",
);

Option 2:

my %conf;
$conf{cflags  } = [qw( -g -O0 )];
$conf{cppflags} = [ @{ $conf{cflags} } ];
$conf{bindir  } = "$PWD/bin";

Option 3:

my %conf = (
    cflags => [qw( -g -O0 )],
    bindir => "$PWD/bin",
);
$conf{cppflags} = [ @{ $conf{cflags} } ];

(In decreasing order of personal preference.)