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[cmake] Add LLVM_UBSAN_FLAGS, to allow overriding UBSan flags

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Allow overriding the default set of flags used to enable UBSan when
building llvm.

This can be used to test new checks or opt out of certain checks.

Differential Revision: https://reviews.llvm.org/D89439
This commit is contained in:
Vedant Kumar 2020-10-14 19:09:50 -07:00
parent 9ad16f9a7c
commit 54baa09ec4
3 changed files with 12 additions and 4 deletions
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4
CMakeLists.txt
View File

@ -487,6 +487,10 @@ endif( LLVM_USE_PERF )
set(LLVM_USE_SANITIZER "" CACHE STRING
"Define the sanitizer used to build binaries and tests.")
option(LLVM_OPTIMIZE_SANITIZED_BUILDS "Pass -O1 on debug sanitizer builds" ON)
set(LLVM_UBSAN_FLAGS
"-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
CACHE STRING
"Compile flags set to enable UBSan. Only used if LLVM_USE_SANITIZER contains 'Undefined'.")
set(LLVM_LIB_FUZZING_ENGINE "" CACHE PATH
"Path to fuzzing library for linking with fuzz targets")

7
cmake/modules/HandleLLVMOptions.cmake
View File

@ -776,8 +776,7 @@ if(LLVM_USE_SANITIZER)
endif()
elseif (LLVM_USE_SANITIZER STREQUAL "Undefined")
append_common_sanitizer_flags()
append("-fsanitize=undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Thread")
append_common_sanitizer_flags()
append("-fsanitize=thread" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
@ -786,8 +785,8 @@ if(LLVM_USE_SANITIZER)
elseif (LLVM_USE_SANITIZER STREQUAL "Address;Undefined" OR
LLVM_USE_SANITIZER STREQUAL "Undefined;Address")
append_common_sanitizer_flags()
append("-fsanitize=address,undefined -fno-sanitize=vptr,function -fno-sanitize-recover=all"
CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("-fsanitize=address" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
append("${LLVM_UBSAN_FLAGS}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
elseif (LLVM_USE_SANITIZER STREQUAL "Leaks")
append_common_sanitizer_flags()
append("-fsanitize=leak" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)

5
docs/CMake.rst
View File

@ -428,6 +428,11 @@ LLVM-specific variables
are ``Address``, ``Memory``, ``MemoryWithOrigins``, ``Undefined``, ``Thread``,
``DataFlow``, and ``Address;Undefined``. Defaults to empty string.
**LLVM_UBSAN_FLAGS**:STRING
Defines the set of compile flags used to enable UBSan. Only used if
``LLVM_USE_SANITIZER`` contains ``Undefined``. This can be used to override
the default set of UBSan flags.
**LLVM_ENABLE_LTO**:STRING
Add ``-flto`` or ``-flto=`` flags to the compile and link command
lines, enabling link-time optimization. Possible values are ``Off``,