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Modify compiler options for overflow and aliasing #507

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Oct 27, 2025
Merged

Modify compiler options for overflow and aliasing #507

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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 @@ -276,9 +276,14 @@ if (CLR_CMAKE_HOST_UNIX)
#-fms-compatibility Enable full Microsoft Visual C++ compatibility
#-fms-extensions Accept some non-standard constructs supported by the Microsoft compiler

# 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_OSX)
# We cannot enable "stack-protector-strong" on OS X due to a bug in clang compiler (current version 7.0.2)
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