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Refine compiler options for signed overflow and aliasing #5618

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Oct 27, 2025
Merged

Refine compiler options for signed overflow and aliasing #5618

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9 changes: 7 additions & 2 deletions eng/native/configurecompiler.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -526,9 +526,14 @@ if (CLR_CMAKE_HOST_UNIX)
# Disable frame pointer optimizations so profilers can get better call stacks
add_compile_options(-fno-omit-frame-pointer)

# Make signed arithmetic overflow of addition, subtraction, and multiplication wrap around
# Make signed overflow well-defined. Implies the following flags in clang-20 and above.
# -fwrapv - Make signed arithmetic overflow of addition, subtraction, and multiplication wrap around
# using twos-complement representation (this is normally undefined according to the C++ spec).
add_compile_options(-fwrapv)
# -fwrapv-pointer - The same as -fwrapv but for pointers.
add_compile_options(-fno-strict-overflow)

# Suppress C++ strict aliasing rules. This matches our use of MSVC.
add_compile_options(-fno-strict-aliasing)

if(CLR_CMAKE_HOST_APPLE)
# Clang will by default emit objc_msgSend stubs in Xcode 14, which ld from earlier Xcodes doesn't understand.
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