Make CFL use re2 instead of std::regex to prevent timeouts

.clusterfuzzlite/Dockerfile

@@ -9,6 +9,20 @@ RUN apt update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
+RUN git clone --depth 1 --branch 20240722.0 https://github.com/abseil/abseil-cpp $SRC/abseil && \
+    cd $SRC/abseil-cpp && \
+    mkdir build && cd build && \
+    cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_POSITION_INDEPENDENT_CODE=ON .. && \
+    cmake --build . --target install && \
+    cd ../.. && rm -rf $SRC/abseil \
+
+RUN git clone --depth 1 --branch 2024-07-02 https://github.com/google/re2 $SRC/re2 && \
+    cd $SRC/re2 && \
+    mkdir build && cd build && \
+    cmake -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_POSITION_INDEPENDENT_CODE=ON .. && \
+    cmake --build . --target install && \
+    cd ../.. && rm -rf $SRC/re2 \
+
 COPY . $SRC/scnlib
 WORKDIR $SRC/scnlib
 COPY ./.clusterfuzzlite/build.sh $SRC/

.clusterfuzzlite/build.sh

@@ -1,12 +1,15 @@
-#!/bin/bash -eu
+#!/usr/bin/env bash
+
+set -xeu
 
 mkdir build
 cd build
 
 cmake .. \
   -G Ninja -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_STANDARD=17 \
   -DSCN_DISABLE_TOP_PROJECT=ON -DSCN_FUZZING=ON \
-  -DSCN_FUZZING_LDFLAGS="$LIB_FUZZING_ENGINE"
+  -DSCN_FUZZING_LDFLAGS="$LIB_FUZZING_ENGINE" \
+  -DSCN_REGEX_BACKEND=re2
 
 cmake --build .
 

tests/fuzz/fuzz.h

@@ -19,6 +19,7 @@
 #include <scn/scan.h>
 #include <scn/xchar.h>
 
+#include <deque>
 #include <sstream>
 
 namespace scn::fuzz {