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Add WEBP_ENABLE_FBOUNDS_SAFETY to CMakeLists.txt

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Conditionally enable -fbounds-safety for webputils

This is the first step towards making -fbounds-safety
(https://clang.llvm.org/docs/BoundsSafety.html) available to folks with
a supported toolchain.

In the next CL, I'll provide a header file which wraps the annotations,
keeping the code portable. It will also address the build failures below
by marking the webputils files as "default unsafe", which shouldn't
change any behavior (build or runtime) when -fbounds-safety is disabled.

Example using a toolchain built from github.com/swiftlang/llvm-project/next

```
$ mkdir build && cd build
$ cmake .. -DCMAKE_C_COMPILER=$(pwd)/../llvm-build/bin/clang -DCMAKE_CXX_COMPILER=$(pwd)/../llvm-build/bin/clang++ -DWEBP_ENABLE_FBOUNDS_SAFETY=true
$ make
...
[ 74%] Building C object CMakeFiles/webputils.dir/src/utils/bit_reader_utils.c.o
In file included from libwebp/src/utils/bit_reader_utils.c:23:
In file included from libwebp/src/utils/bit_reader_inl_utils.h:30:
libwebp/src/utils/utils.h:72:14: error: passing 'const uint8_t *__single' (aka 'const unsigned char *__single') with pointee of size 1 to parameter '__src' of type
      'const void *__single __sized_by(__n)' (aka 'const void *__single') with size value of 4 always fails
   72 |   memcpy(&A, ptr, sizeof(A));
      |              ^    ~~~~~~~~~
...
```

Bug: webp:432511821
Change-Id: Ie3db8d29445f2cff06e2ee180f5dd454acedbae3
This commit is contained in:
mxms
2025-07-17 20:15:33 +00:00
parent 08b51dd130
commit a7002d2089
1 changed files with 9 additions and 0 deletions
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9
CMakeLists.txt
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@ -46,6 +46,10 @@ option(WEBP_USE_THREAD "Enable threading support" ON)
option(WEBP_NEAR_LOSSLESS "Enable near-lossless encoding" ON)
option(WEBP_ENABLE_SWAP_16BIT_CSP "Enable byte swap for 16 bit colorspaces."
OFF)
option(
WEBP_ENABLE_FBOUNDS_SAFETY
"Enable -fbounds-safety for the part of the codebase which supports it. This expects an experimental toolchain."
OFF)
set(WEBP_BITTRACE "0" CACHE STRING "Bit trace mode (0=none, 1=bit, 2=bytes)")
set_property(CACHE WEBP_BITTRACE PROPERTY STRINGS 0 1 2)
option(WEBP_ENABLE_WUNUSED_RESULT "Add [[nodiscard]] to some functions. \
@ -408,6 +412,11 @@ target_include_directories(webputils PRIVATE ${CMAKE_CURRENT_BINARY_DIR}
${CMAKE_CURRENT_SOURCE_DIR})
add_library(webp $<TARGET_OBJECTS:webpdecode> $<TARGET_OBJECTS:webpdsp>
$<TARGET_OBJECTS:webpencode> $<TARGET_OBJECTS:webputils>)
if(WEBP_ENABLE_FBOUNDS_SAFETY)
# Enable -fbounds-safety only for webputils for now.
target_compile_options(webputils PRIVATE -fbounds-safety)
endif()
target_link_libraries(webp sharpyuv)
if(XCODE)
libwebp_add_stub_file(webp)