feat: introduce GCC disable environment variable

This change is to disable the GCC plugin version check for
GCC plugin and CMPLOG, to overcome the issues with incompatability
with expected GCC version and actual GCC version used to compile
using `AFL_GCC_DISABLE_VERSION_CHECK` environment variable.

1 files changed, 2 insertions, 1 deletions

diff --git a/instrumentation/afl-gcc-cmplog-pass.so.cc b/instrumentation/afl-gcc-cmplog-pass.so.cc
index 774dd5fd..38fce961 100644
--- a/instrumentation/afl-gcc-cmplog-pass.so.cc
+++ b/instrumentation/afl-gcc-cmplog-pass.so.cc
@@ -370,7 +370,8 @@ Set AFL_QUIET in the environment to silence it.\n\
 int plugin_init(struct plugin_name_args   *info,
                 struct plugin_gcc_version *version) {
 
-  if (!plugin_default_version_check(version, &gcc_version))
+  if (!plugin_default_version_check(version, &gcc_version) &&
+      !getenv("AFL_GCC_DISABLE_VERSION_CHECK"))
     FATAL(G_("GCC and plugin have incompatible versions, expected GCC %s, "
              "is %s"),
           gcc_version.basever, version->basever);