add description of environment variables used
@@ -532,7 +532,21 @@ int main(int argc, char** argv) {
"advisable to\n"
"set AFL_INST_RATIO to a value less than 100 in order to reduce the "
"odds of\n"
- "instrumenting every discovered branch.\n\n");
+ "instrumenting every discovered branch.\n\n"
+ "Environment variables used:\n"
+ "AFL_AS: path to assembler to use for instrumented files\n"
+ "AFL_CC: fall back path to assembler\n"
+ "AFL_CXX: fall back path to assembler\n"
+ "TMPDIR: directory to use for temporary files\n"
+ "TEMP: fall back path to directory for temporary files\n"
+ "TMP: fall back path to directory for temporary files\n"
+ "AFL_INST_RATIO: user specified instrumentation ratio\n"
+ "AFL_QUIET: suppress verbose output\n"
+ "AFL_KEEP_ASSEMBLY: leave instrumented assembly files\n"
+ "AFL_AS_FORCE_INSTRUMENT: force instrumentation\n"
+ "AFL_HARDEN, AFL_USE_ASAN, AFL_USE_MSAN, ALF_USE_UBSAN:\n"
+ " used in the instrumentation summary message\n"
+ );
exit(1);
