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[CMAKE] Add -fno-aggressive-loop-optimizations flag

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ReactOS/Windows headers contain lots of structures whose last field is
fieldName[ANYSIZE] or fieldName[1].
Starting with GCC 4.8, gcc considers that accessing items [2], [3], ...
are undefined operation, and may optimize those accesses by removing them!

Add flag -fno-aggressive-loop-optimizations to prevent this unwanted behaviour.
This commit is contained in:
Hervé Poussineau
2019-03-31 08:40:36 +02:00
parent 6668178cff
commit 95671c25ec
1 changed files with 1 additions and 0 deletions
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sdk/cmake/gcc.cmake
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@@ -46,6 +46,7 @@ add_compile_flags("-nostdinc")
if(GCC_VERSION VERSION_GREATER 4.7)
add_compile_flags("-mstackrealign")
add_compile_flags("-fno-aggressive-loop-optimizations")
endif()
if(CMAKE_C_COMPILER_ID STREQUAL "Clang")