build-system: turn off lto=thin when building the fuzzers

With lto=thin the fuzzers fail as soon as they start with ``` ERROR: The size of coverage PC tables does not match the number of instrumented PCs. This might be a compiler bug, please contact the libFuzzer developers. Also check https://bugs.llvm.org/show_bug.cgi?id=34636 for possible workarounds (tl;dr: don't use the old GNU ld) ``` Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>

build-system: turn off lto=thin when building the fuzzers
3a07cd42 · Evgeny Vereshchagin · Christian Brauner · b94e8142 · 3a07cd42 · 3a07cd42
Unverified Commit 3a07cd42 authored Apr 27, 2021 by Evgeny Vereshchagin Committed by Christian Brauner Apr 29, 2021
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configure.ac configure.ac +9 -6

oss-fuzz.sh src/tests/oss-fuzz.sh +0 -3

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--- a/configure.ac
+++ b/configure.ac
@@ -484,12 +484,16 @@ else
 	AC_MSG_RESULT([no])
 fi
-if test "x$enable_fuzzers" = "xyes" -a "x$LIB_FUZZING_ENGINE" = x; then
+if test "x$enable_fuzzers" = "xyes"; then
-	CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[ \
+	if test "x$LIB_FUZZING_ENGINE" = x; then
-		-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION \
+		CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[ \
-		-fsanitize=fuzzer-no-link])
+			-DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION \
-	AC_SUBST(AM_CFLAGS)
+			-fsanitize=fuzzer-no-link])
+	fi
+else
+	CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[-flto=thin])
 fi
+AC_SUBST(AM_CFLAGS)
 # Optional test binaries
 AC_ARG_ENABLE([tests],
@@ -815,7 +819,6 @@ CC_CHECK_FLAGS_APPEND([AM_CFLAGS],[CFLAGS],[ \
 	-Warray-bounds \
 	-Wrestrict \
 	-Wreturn-local-addr \
-	-flto=thin \
 	-fsanitize=cfi \
 	-Wstringop-overflow])
 AC_SUBST(AM_CFLAGS)

--- a/src/tests/oss-fuzz.sh
+++ b/src/tests/oss-fuzz.sh
@@ -24,9 +24,6 @@ mkdir -p $OUT
 export LIB_FUZZING_ENGINE=${LIB_FUZZING_ENGINE:--fsanitize=fuzzer}
-# AFL++ and hoggfuzz are both incompatible with lto=thin apparently
-sed -i '/-flto=thin/d' configure.ac
 # turn off the libutil dependency
 sed -i 's/^AC_CHECK_LIB(util/#/' configure.ac