espeak-ng: fix build

Updated build script to enable more verbose error reporting and improved build process for fuzzers.

Author: DavidKorczynski

projects/espeak-ng/build.sh

@@ -1,4 +1,4 @@
-#!/bin/bash -eu
+#!/bin/bash -eux
 # Copyright 2021 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -19,7 +19,22 @@
 # build project
 export ASAN_OPTIONS=detect_leaks=0
 ./autogen.sh
-./configure --with-libfuzzer=yes --disable-shared --with-speechplayer=no
-make check || true
-cp tests/ssml-fuzzer.test $OUT/ssml-fuzzer
+./configure --disable-shared --with-speechplayer=no
+make -j$(nproc)
+
+# Build the ssml-fuzzer manually with $LIB_FUZZING_ENGINE
+$CC $CFLAGS -I. -Isrc/include -c tests/ssml-fuzzer.c -o tests/ssml-fuzzer.o
+$CXX $CXXFLAGS $LIB_FUZZING_ENGINE tests/ssml-fuzzer.o \
+    src/.libs/libespeak-ng.a -o $OUT/ssml-fuzzer -lm
+
+# Build the synth_fuzzer manually with $LIB_FUZZING_ENGINE
+# Instruct the synth_fuzzer to use "en" for FUZZ_VOICE. We do not set
+# the environment variable at runtime, so we conver https://github.com/espeak-ng/espeak-ng/blob/3dcbe7ea3ea85a9212968d0f05172dde4259e770/tests/fuzzing/synth_fuzzer.c#L54C22-L54C28
+# to const char *lang = "en";//getenv("FUZZ_VOICE");
+sed -i 's/getenv/"en";\/\//g' tests/fuzzing/synth_fuzzer.c
+$CC $CFLAGS -I. -Isrc/include -DPATH_ESPEAK_DATA=\"/out/espeak-ng-data\" -Isrc/libespeak-ng \
+    -c tests/fuzzing/synth_fuzzer.c -o tests/fuzzing/synth_fuzzer.o
+$CXX $CXXFLAGS $LIB_FUZZING_ENGINE tests/fuzzing/synth_fuzzer.o \
+    src/.libs/libespeak-ng.a -o $OUT/synth_fuzzer -lm
+
 cp -r espeak-ng-data/ $OUT/