NFC: Fix gmock integration in unit tests#8879
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Previously, when `BUILD_FUZZTEST=ON`, the `fuzztest` dependency would download its own newer version of `googletest` (v1.14.0) via CMake `FetchContent`. The `gmock` headers bundled in Binaryen's `third_party/googletest/googlemock` were incompatible with this newer `googletest`. This caused compilation failures for tests using `gmock`. As a workaround, `source-map.cpp` was completely excluded from the test suite during fuzztest builds. This fix works because `fuzztest`'s `FetchContent` actually makes the `gmock` target available as well. By linking `binaryen-unittests` against the `gmock` target when `BUILD_FUZZTEST=ON`, CMake correctly configures the include paths to use the newly fetched `gmock` headers instead of the bundled ones, seamlessly resolving the incompatibility. - Unconditionally include `source-map.cpp` in unit tests, rather than conditionally disabling it when `BUILD_FUZZTEST` is ON. - Link against the `gmock` target for `binaryen-unittests` when `BUILD_FUZZTEST` is ON. - Add a simple gmock test in `arena.cpp` to demonstrate that it correctly compiles and links.
stevenfontanella
changed the title
aheejin
approved these changes
Jul 1, 2026
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Tested with the following code which passes (in arena.cpp, not in source-map.cpp which would have already worked previously due to how it was handled in the build file):
This was written by Gemini. I didn't quite understand the fix but I figured it's worth doing to make tests easier to write. Below is Gemini's description of the fix.
Previously, when
BUILD_FUZZTEST=ON, thefuzztestdependency would download its own newer version ofgoogletest(v1.14.0) via CMakeFetchContent. Thegmockheaders bundled in Binaryen'sthird_party/googletest/googlemockwere incompatible with this newergoogletest. This caused compilation failures for tests usinggmock. As a workaround,source-map.cppwas completely excluded from the test suite during fuzztest builds.This fix works because
fuzztest'sFetchContentactually makes thegmocktarget available as well. By linkingbinaryen-unittestsagainst thegmocktarget whenBUILD_FUZZTEST=ON, CMake correctly configures the include paths to use the newly fetchedgmockheaders instead of the bundled ones, seamlessly resolving the incompatibility.source-map.cppin unit tests, rather than conditionally disabling it whenBUILD_FUZZTESTis ON.gmocktarget forbinaryen-unittestswhenBUILD_FUZZTESTis ON.