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#!/usr/bin/perl
# This script is designed to introspect C files and generate a makefile to use.
sub header_deps {
my $file = @_[0];
my @headers;
if (open(my $fh, '<:encoding(UTF-8)', $file)) {
print STDERR "\x1b[35m[Trace] - Reading file $file\x1b[00m\n";
push(@headers, $file);
while (<$fh>) {
/#include\s+"(.*)"\s*$/ && push(@headers, header_deps("include/$1"));
}
}
return @headers;
}
my @files = glob('src/*.c');
my @obj_files;
open(my $fh, '<:encoding(UTF-8)', "Makefile.preamble")
or die "Missing Makefile.preamble";
while (<$fh>) {
print "$_";
}
# Emit a rule that will rerun genmake if the c files do not match.
my $idempotency_cmd =
"ls src/*.c include/*.h| sha1sum | awk '{print \$1}'";
my $idempotency_cmd_make =
"ls src/*.c include/*.h | sha1sum | awk '{print \$\$1}'";
print "IDEMPOTENCY_HASH=" . `$idempotency_cmd` . "\n";
my $arch_obs_dir = "_\$(PREFIX)_obs";
print "CHEAT_PRE_MAKE := \$(shell mkdir -p $arch_obs_dir)\n";
foreach $file (@files) {
my $c_file = $file;
(my $file_no_ext = $file) =~ s/src\/(.*)\.c$/\1/g;
my $obj_file = "$arch_obs_dir/${file_no_ext}.o";
my $s_file = "${file_no_ext}.s";
push(@obj_files, $obj_file);
my @deps = header_deps($c_file);
my $deps_as_join = join(" ", @deps);
# Emit the rule to make the object file.
print "$obj_file: $deps_as_join\n\t";
print '$(CC) -c ' . $c_file . ' -o ' . $obj_file . ' $(CFLAGS)' . "\n\n";
# Emit the rule to make the assembly file.
print "$s_file: $deps_as_join\n\t";
print '$(CC) -S ' . $c_file . ' -o ' . $s_file . ' $(CFLAGS)' . "\n\n";
}
my $obj_files_deps = join(' ', @obj_files);
print "FORCE:\n\t\n\n";
print "$arch_obs_dir/main.elf: FORCE $obj_files_deps linker/linker_script.ld\n\t";
print "([ \"\$\$($idempotency_cmd_make)\" != \"\$(IDEMPOTENCY_HASH)\" ] "
. "&& ./genmake.pl > Makefile && make main.elf ) "
. "|| "
. "\$(LD) -o $arch_obs_dir/main.elf \$(LD_FLAGS) $obj_files_deps\n\n";
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