fix compiler rt on -c

docs/Changelog.md

@@ -14,6 +14,9 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
     - add non-unicode variants from unicode-looking dictionary entries
     - Rust custom mutator API improvements
   - afl-cc:
+    - added AFL_NOOPT that will just pass everything to the normal
+      gcc/clang compiler without any changes - to pass weird configure
+      scripts
     - fixed a crash that can occur with ASAN + CMPLOG together plus
       better support for unicode (thanks to @stbergmann for reporting!)
     - fixed a crash in LAF transform for empty strings
@@ -21,7 +24,10 @@ sending a mail to <afl-users+subscribe@googlegroups.com>.
       compiled into the target. This now also supports dlopen()
       instrumented libs loaded before the forkserver and even after the
       forkserver is started (then with collisions though)
-    - Renamed CTX to CALLER, added correct/real CTX implementation to CLASSIC
+    - the compiler rt was added also in object building (-c) which
+      should have been fixed years ago but somewhere got lost :(
+    - Renamed CTX to CALLER, added correct/real CTX implementation to
+      CLASSIC
   - qemu_mode:
     - added AFL_QEMU_EXCLUDE_RANGES env by @realmadsci, thanks!
     - if no new/updated checkout is wanted, build with:

src/afl-cc.c

@@ -940,7 +940,10 @@ static void edit_params(u32 argc, char **argv, char **envp) {
 
   }
 
-  if (preprocessor_only) {
+  // prevent unnecessary build errors
+  cc_params[cc_par_cnt++] = "-Wno-unused-command-line-argument";
+
+  if (preprocessor_only || have_c) {
 
     /* In the preprocessor_only case (-E), we are not actually compiling at
        all but requesting the compiler to output preprocessed sources only.
@@ -1001,18 +1004,15 @@ static void edit_params(u32 argc, char **argv, char **envp) {
     }
 
   #if !defined(__APPLE__) && !defined(__sun)
-    if (!shared_linking && !have_c)
+    if (!shared_linking)
       cc_params[cc_par_cnt++] =
           alloc_printf("-Wl,--dynamic-list=%s/dynamic_list.txt", obj_path);
   #endif
 
   #if defined(USEMMAP) && !defined(__HAIKU__)
-    if (!have_c) cc_params[cc_par_cnt++] = "-lrt";
+    cc_params[cc_par_cnt++] = "-lrt";
   #endif
 
-    // prevent unnecessary build errors
-    cc_params[cc_par_cnt++] = "-Wno-unused-command-line-argument";
-
   }
 
 #endif