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echo off

REM CONFIGURATION

REM Directories to find C and s files to compile/assemble
set DIRS=arch . class drivers stdlib

REM Compile parameters
set CC=gcc
set CFLAGS=-fno-builtin -O0 -I include -nostdinc

REM Assemble parameters
set AS=NASM
set ASFLAGS=-f aout

REM Linker parameters
set LINKER=ld
set OBJECT_LIST_FILE=ofiles.txt
set OUTPUT_FILE=kernel.bin
set LINKER_PARAMS=-T link.txt





REM Perform compilation/assembly
for %%D in (%DIRS%) do call compile.bat %%D

REM Generate a list of output files (.o)
call genout.bat > ofiles.txt

echo Linking...
%LINKER% %LINKER_PARAMS% -o %OUTPUT_FILE% @%OBJECT_LIST_FILE%

pause

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echo Checking Directory %1

REM Compile all .c
for %%X in (%1/*.c) do (call procc.bat %1/%%X)

REM Assemble all .s
for %%X in (%1/*.s) do (call procs.bat %1/%%X)

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set rawstr=%1
set str=%rawstr:.c=%
if exist %str%.o goto compare_mtime
goto do_compile
goto end


:compare_mtime
REM mcmp is a C program that will compare modification times.
REM If output file mtime is older than input file mtime then compilation is required
REM mcmp returns 2 when above condition is satisfied.
mcmp %str%.o %1
if %ERRORLEVEL%==2 goto do_compile
goto end

:do_compile
echo Compiling file %1
%CC% %CFLAGS% -c -o %str%.o %1

:end

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REM Remove .s from the filename
set rawstr=%1
set str=%rawstr:.s=%
if exist %str%.o goto compare_mtime
goto do_assemble
goto end


:compare_mtime
mcmp %str%.o %1
if %ERRORLEVEL%==2 goto do_assemble
goto end

:do_assemble
echo Assembling %1
%AS% %ASFLAGS% -o %str%.o %1

:end

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for %%D in (%DIRS%) do call outfiles.bat %%D

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for %%X in (%1/*.o) do echo %1/%%X

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#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>

/*A utility to compare modification times of files*/

int main(int nr, char *argv[])
{
	struct stat buf1, buf2;
	if(nr < 3) {
		printf("Invalid number of arguments\nUsage: %s <file1> <file2>", argv[0]);
		return 3;
	}
	stat(argv[1], &buf1);
	stat(argv[2], &buf2);
	if(buf1.st_mtime > buf2.st_mtime)
		return 1;
	else
		return 2;
}

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all:
    echo "compiling program"
    cc *.c -o program

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all:
   @echo "compiling program"
...