From: Evgeny Vereshchagin <evvers@ya.ru>
Date: Tue, 28 Jul 2020 04:17:40 +0000 (+0000)
Subject: build-sys: add support for --enable-fuzzing-engine
X-Git-Tag: v2.37-rc1~527^2~8
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=75196cd8be5d0ab3d724bd318de98b9e0ae7038a;p=thirdparty%2Futil-linux.git

build-sys: add support for --enable-fuzzing-engine

Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>
---

diff --git a/Makefile.am b/Makefile.am
index 429b6289a7..12cb86cba4 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -10,14 +10,24 @@ AM_CPPFLAGS += \
 	-D_PATH_VENDORDIR=\"${vendordir}\"
 endif
 
+if FUZZING_ENGINE
+if !OSS_FUZZ
+AM_CPPFLAGS += \
+	-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+endif
+endif
+
 AM_CFLAGS = -fsigned-char $(WARN_CFLAGS)
-AM_LDFLAGS = $(ASAN_LDFLAGS) $(UBSAN_LDFLAGS)
+AM_CXXFLAGS = $(AM_CFLAGS)
+AM_LDFLAGS = $(ASAN_LDFLAGS) $(UBSAN_LDFLAGS) $(FUZZING_ENGINE_LDFLAGS)
 
 # Add gettext stuff to the global LDADD for systems with separate libintl
 # library. The LTLIBINTL is generated by AM_GNU_GETTEXT macro.
 #
 LDADD = $(LTLIBINTL)
 
+LIB_FUZZING_ENGINE ?= -fsanitize=fuzzer
+
 # Automake (at least up to 1.10) mishandles dist_man_MANS inside conditionals.
 # Unlike with other dist primaries, the files are not distributed if the
 # conditional is false.
diff --git a/configure.ac b/configure.ac
index 8815d270b8..94b6ab0682 100644
--- a/configure.ac
+++ b/configure.ac
@@ -193,8 +193,16 @@ AC_ARG_ENABLE([fuzzing-engine],
   AS_HELP_STRING([--enable-fuzzing-engine], [compile with fuzzing engine]),
   [], [enable_fuzzing_engine=no]
 )
+AS_IF([test "x$enable_fuzzing_engine" = xyes -a "x$LIB_FUZZING_ENGINE" = x], [
+  UL_WARN_ADD([-fno-omit-frame-pointer])
+  UL_WARN_ADD([-gline-tables-only])
+  UL_WARN_ADD([-fsanitize=fuzzer-no-link])
+  FUZZING_ENGINE_LDFLAGS="-fsanitize=fuzzer-no-link"
+])
+AC_SUBST([FUZZING_ENGINE_LDFLAGS])
 AC_PROG_CXX
-AM_CONDITIONAL([FUZZING_ENGINE], [test x$enable_fuzzing_engine = xyes])
+AM_CONDITIONAL([FUZZING_ENGINE], [test "x$enable_fuzzing_engine" = xyes])
+AM_CONDITIONAL([OSS_FUZZ], [test "x$LIB_FUZZING_ENGINE" != x])
 
 dnl libtool-2
 LT_INIT