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#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <string.h>
#define CC "gcc", "-O3"
int status;
#define RUN_CMD(...) do { \
if (fork() == 0) { \
char* args[] = __VA_ARGS__; \
print_cmd(args); \
execvp(args[0], args); \
return 0; \
} else { \
wait(&status); \
} \
} while (0);
void print_cmd(char** args) {
int i = 0;
while (args[i] != NULL) {
printf("%s ", args[i++]);
}
printf("\n");
}
// https://github.com/tsoding/nob.h/blob/0a08926d8094fc4ae678155c5d73ae21d1f96f3f/nob.h#L2413
int needs_rebuild(char* bin_file, char* source_file) {
struct stat statbuf = {0};
if (stat(bin_file, &statbuf) < 0) {
if (errno == ENOENT) return 1;
return -1;
}
time_t output_path_time = statbuf.st_mtime;
if (stat(source_file, &statbuf) < 0) {
fprintf(stderr, "could not stat %s: %s", source_file, strerror(errno));
return -1;
}
time_t input_path_time = statbuf.st_mtime;
return input_path_time > output_path_time;
}
int main(int argc, char** argv) {
if (needs_rebuild(argv[0], __FILE__)) {
RUN_CMD({CC, __FILE__, "-o", argv[0], NULL});
if (status != 0) {
// cc error
return 0;
}
print_cmd(argv);
execvp(argv[0], argv);
}
RUN_CMD({CC, "src/main.c", "-o", "lorem", NULL});
char* args[] = {"./lorem", NULL};
print_cmd(args);
execvp(args[0], args);
}
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