Instead of reimplementing one of the commands in Perl, you can be the shell!
use strict;
use warnings;
use IPC::Open3 qw( open3 );
my $make_file = 'Makefile';
open(local *TO_MAKE, '<&', *STDIN) or die;
*TO_MAKE if 0; # Avoid spurious warning.
my $make_pid = open3(
'<&TO_MAKE',
local *FR_MAKE,
undef,
'make', '-f', $make_file,
);
*FR_MAKE if 0; # Avoid spurious warning.
my $tee_pid = open3(
'<&FR_MAKE',
'>&STDOUT',
undef,
'tee', '-a', 'build.log',
);
waitpid($make_pid, 0);
print("$?\n");
waitpid($tee_pid, 0);
print("$?\n");
Duplicating our STDIN instead of using '<&STDIN' is necessary since open3 closes the handle we pass for the child's STDIN.
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