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Build: Only specify -fzero-call-used-regs with compiler >= GCC 11.1

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This fixes the use case of using clang, or building inside CLion with
an older host compiler.
This commit is contained in:
Brian Gianforcaro 2021-07-25 13:56:06 -07:00 • committed by Andreas Kling
commit f43423edc3
Notes: sideshowbarker 2024-07-18 08:20:17 +09:00
1 changed files with 6 additions and 2 deletions
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8
Kernel/CMakeLists.txt
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@ -347,10 +347,14 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mno-80387 -mno-mmx -mno-sse -mno-sse2")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-asynchronous-unwind-tables")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fstack-protector-strong")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions")
# Zero any registers used within a function on return (to reduce data lifetime and ROP gadgets).
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fzero-call-used-regs=used-gpr")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -nostdlib -nostdinc -nostdinc++")
# Apply any flags that are only available on >= GCC 11.1
if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 11.1)
# Zero any registers used within a function on return (to reduce data lifetime and ROP gadgets).
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fzero-call-used-regs=used-gpr")
endif()
if ("${SERENITY_ARCH}" STREQUAL "x86_64")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcmodel=large -mno-red-zone")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -faligned-new=8")