Merge pull request #642 from LebedevRI/oss-fuzz-lto

oss-fuzz: enable LTO

Author: LebedevRI

.ci/oss-fuzz.sh

@@ -25,6 +25,9 @@ RAWSPEED_BUILD="$WORK/rawspeed"
 
 ln -f -s /usr/local/bin/lld /usr/bin/ld
 
+THINLTO_CACHE="$WORK/thinlto-cache"
+LDFLAGS="${LDFLAGS:-} -Wl,--thinlto-cache-dir=\"$THINLTO_CACHE\""
+
 cd "$SRC"
 
 LIBCXX_LLVM_VER="19.1.7"
@@ -74,6 +77,7 @@ if [[ $SANITIZER = *undefined* ]]; then
 fi
 
 cmake -S "$RAWSPEED_SOURCE" -B "$RAWSPEED_BUILD" \
+  -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=ON \
   -DBINARY_PACKAGE_BUILD=ON -DWITH_OPENMP=ON \
   -DWITH_PUGIXML=OFF -DUSE_XMLLINT=OFF -DWITH_JPEG=OFF -DWITH_ZLIB=OFF \
   -DBUILD_TESTING=OFF -DBUILD_TOOLS=OFF -DBUILD_BENCHMARKING=OFF \

.github/workflows/CI-ossfuzz.yml

@@ -8,10 +8,10 @@ on:
 jobs:
   linux:
     runs-on: ubuntu-latest
-    timeout-minutes: 60
+    timeout-minutes: 70
     steps:
       - name: (OSS-FUZZ) Building with ${{ inputs.sanitizer }} sanitizer
-        timeout-minutes: 15
+        timeout-minutes: 25
         id: build
         uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
         with:

cmake/compiler-flags.cmake

@@ -50,10 +50,20 @@ SET(CMAKE_MODULE_LINKER_FLAGS
     "${CMAKE_MODULE_LINKER_FLAGS} ${linkerflags}"
     )
 
+if(CMAKE_INTERPROCEDURAL_OPTIMIZATION)
+  if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
+    set(LIST )
+    list(APPEND LIST -fforce-emit-vtables)
+    list(APPEND LIST -fno-whole-program-vtables)
+    list(APPEND LIST -fno-strict-vtable-pointers)
+    add_compile_options("$<$<COMPILE_LANGUAGE:C,CXX>:${LIST}>")
+  endif()
+endif()
+
 if(RAWSPEED_ENABLE_LTO)
   if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     include(llvm-toolchain)
-    set(lto_compile "-flto=thin -fforce-emit-vtables -fwhole-program-vtables -fstrict-vtable-pointers")
+    set(lto_compile "-flto=thin")
     set(lto_link "-flto=thin -fuse-ld=\"${LLVMLLD_EXECUTABLE}\" ${LLVMLLD_INCREMENTAL_LDFLAGS}")
   elseif(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     include(gcc-toolchain)