add descriptions of env variables to afl-gcc
MODIFY
src/afl-as.c
src/afl-as.c
@@ -543,8 +543,8 @@ int main(int argc, char** argv) {
"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"
+ "AFL_AS_FORCE_INSTRUMENT: force instrumentation for asm sources\n"
+ "AFL_HARDEN, AFL_USE_ASAN, AFL_USE_MSAN, AFL_USE_UBSAN:\n"
" used in the instrumentation summary message\n");
exit(1);

MODIFY
src/afl-gcc.c
src/afl-gcc.c
@@ -382,8 +382,32 @@ int main(int argc, char** argv) {
"You can specify custom next-stage toolchain via AFL_CC, AFL_CXX, and "
"AFL_AS.\n"
"Setting AFL_HARDEN enables hardening optimizations in the compiled "
- "code.\n\n",
- BIN_PATH, BIN_PATH);
+ "code.\n\n"
+
+ "Environment variables used by afl-gcc:\n"
+ "AFL_CC: path to the C compiler to use\n"
+ "AFL_CXX: path to the C++ compiler to use\n"
+ "AFL_GCJ: path to the java compiler to use\n"
+ "AFL_PATH: path to the instrumenting assembler\n"
+ "AFL_DONT_OPTIMIZE: disable optimization instead of -O3\n"
+ "AFL_NO_BUILTIN: compile for use with libtokencap.so\n"
+ "AFL_QUIET: suppress verbose output\n"
+ "AFL_CAL_FAST: speed up the initial calibration\n"
+ "AFL_HARDEN: adds code hardening to catch memory bugs\n"
+ "AFL_USE_ASAN: activate address sanitizer\n"
+ "AFL_USE_MSAN: activate memory sanitizer\n"
+ "AFL_USE_UBSAN: activate undefined behaviour sanitizer\n"
+
+ "\nEnvironment variables used by afl-as (called by afl-gcc):\n"
+ "AFL_AS: path to the assembler to use\n"
+ "TMPDIR: set the directory for temporary files of afl-as\n"
+ "TEMP: fall back path to directory for temporary files\n"
+ "TMP: fall back path to directory for temporary files\n"
+ "AFL_INST_RATIO: percentage of branches to instrument\n"
+ "AFL_QUIET: suppress verbose output\n"
+ "AFL_KEEP_ASSEMBLY: leave instrumented assembly files\n"
+ "AFL_AS_FORCE_INSTRUMENT: force instrumentation for asm sources\n"
+ , BIN_PATH, BIN_PATH);
exit(1);

add descriptions of env variables to afl-gcc