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-pass.so.cc b/instrumentation/afl-gcc-pass.so.cc
index 41b1e5af..26f7bd19 100644
--- a/instrumentation/afl-gcc-pass.so.cc
+++ b/instrumentation/afl-gcc-pass.so.cc
@@ -478,7 +478,8 @@ Specify -frandom-seed for reproducible instrumentation.\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);