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windows: MSVC: disable extra dubious Microsoft runtime checks

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Cmake by default adds the `/RTC1` compiler flag for debug builds.
However, this causes C code that conforms to the C standard and has
well-defined behavior to trap. Here I've updated CMAKE to use the more
lenient `/RTCs` by default which removes the uninitialized variable checks
but keeps the stack error checks.
This commit is contained in:
Jonathan Marler 2025-06-17 19:42:13 -06:00 committed by Alex Rønne Petersen
parent 850655f06b
commit f3940ad858
1 changed files with 6 additions and 0 deletions
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6
CMakeLists.txt
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@ -694,6 +694,12 @@ if(MSVC)
set(ZIG_DIA_GUIDS_LIB "${MSVC_DIA_SDK_DIR}/lib/amd64/diaguids.lib")
string(REGEX REPLACE "\\\\" "\\\\\\\\" ZIG_DIA_GUIDS_LIB_ESCAPED "${ZIG_DIA_GUIDS_LIB}")
endif()
# The /RTC[c][s][u] flag enables extra runtime checks. ("/RTC1" == "/RTCsu")
# The "c" (PossibleDataLoss) and "u" (UninitializeVariable) flags trap on valid C code so we disable
# them. The "s" flag seems like it might be OK.
string(REPLACE "/RTC1" "/RTCs" CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG}")
string(REPLACE "/RTC1" "/RTCs" CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG}")
endif()
configure_file (