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Add option to enable spectre mitigation in MSVC #1125

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Add option to enable spectre mitigation in MSVC #1125

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8 changes: 8 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -38,6 +38,7 @@ option(LIBRESSL_TESTS "Build tests" ON)
option(ENABLE_ASM "Enable assembly" ON)
option(ENABLE_EXTRATESTS "Enable extra tests that may be unreliable on some platforms" OFF)
option(ENABLE_NC "Enable installing TLS-enabled nc(1)" OFF)
option(ENABLE_SPECTRE_MITIGATION "Enable MSVC Spectre mitigation" OFF)
set(OPENSSLDIR ${OPENSSLDIR} CACHE PATH "Set the default openssl directory" FORCE)
set(LIBRESSL_INSTALL_CMAKEDIR "${CMAKE_INSTALL_LIBDIR}/cmake/LibreSSL" CACHE STRING "Installation directory for the CMake targets")

Expand Down Expand Up @@ -150,6 +151,13 @@ if(MSVC)
add_definitions(-Dinline=__inline)
message(STATUS "Using [${CMAKE_C_COMPILER_ID}] compiler")

if(ENABLE_SPECTRE_MITIGATION)
if(MSVC_VERSION LESS 1912)
message(FATAL_ERROR "Spectre mitigation unavailable before MSVC 2017 15.5")
endif()
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Qspectre")
endif()

include(TestBigEndian)
TEST_BIG_ENDIAN(HAVE_BIG_ENDIAN)
if(HAVE_BIG_ENDIAN)
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