fix oss-fuzz build with libtiff

diff --git a/Magick++/fuzz/build.sh b/Magick++/fuzz/build.sh
index 20b5cc6219898292ca51c1e5e068801cfaf90dec..ef8c6c60333e16b3d6fde9b437a7298d3ad47aa7 100644 (file)
--- a/Magick++/fuzz/build.sh
+++ b/Magick++/fuzz/build.sh
@@ -23,16 +23,22 @@ popd
 
 # Build libjpeg-turbo
 pushd "$SRC/libjpeg-turbo"
-cmake . -DCMAKE_INSTALL_PREFIX=$WORK -DENABLE_STATIC=on -DENABLE_SHARED=off
+CFLAGS="$CFLAGS -fPIC" cmake . -DCMAKE_INSTALL_PREFIX=$WORK -DENABLE_STATIC=on -DENABLE_SHARED=off
 make -j$(nproc)
 make install
 popd
 
 # Build libtiff
+# We build shared and static here to make IM's libtiff detection via autoconf more reliable
+# The fuzzers themselves link solely against the static build though.
 pushd "$SRC/libtiff"
 cmake . -DCMAKE_INSTALL_PREFIX=$WORK
 make -j$(nproc)
 make install
+git clean -fd
+cmake . -DCMAKE_INSTALL_PREFIX=$WORK -DBUILD_SHARED_LIBS=off
+make -j$(nproc)
+make install
 popd
 
 # Build liblcms2