fix: use CFLAGS environment variable

src/cjit.c

@@ -857,6 +857,7 @@ int main(int argc, char **argv) {
   // const char *progname = "cjit";
   static bool verbose = false;
   static bool version = false;
+  static char *extra_cflags = NULL;
   char tmptemplate[] = "/tmp/CJIT-exec.XXXXXX";
   char *tmpdir = NULL;
   int res = 1;
@@ -875,6 +876,12 @@ int main(int argc, char **argv) {
     _err("Could not initialize tcc");
     exit(1);
   }
+  // get the extra cflags from the CFLAGS env variable
+  if(getenv("CFLAGS")) {
+    extra_cflags = getenv("CFLAGS");
+    _err("CFLAGS: %s",extra_cflags);
+    tcc_set_options(TCC, extra_cflags);
+  }
 
   // initialize the tmpdir for execution
 #ifndef LIBC_MINGW32

test/cflags.c

@@ -0,0 +1,19 @@
+/* Test CFLAGS env parsing
+ * run me successfully only with:
+ *    CFLAGS="-DALLOWED=1" cjit test/cflags.c
+ */
+
+#if !defined(ALLOWED) || (ALLOWED != 1)
+
+#error Running this program is not allowed. Please compile with -DALLOWED=1
+
+#else
+
+#include <stdio.h>
+
+int main(void) 
+{
+    printf("Success.\n");
+    return 0;
+}
+#endif