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cmake: allow cross-CPU builds via LIBRESSL_CPU #935

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cmake: allow cross-CPU builds via LIBRESSL_CPU #935

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63 changes: 38 additions & 25 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -62,6 +62,28 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
endif()

# Allow cross-compilation by accepting a custom CPU name.
# If not set, auto-detect it based on other signals.
if(NOT DEFINED LIBRESSL_CPU OR LIBRESSL_CPU STREQUAL "")
if(APPLE AND (NOT CMAKE_OSX_ARCHITECTURES STREQUAL ""))
# This isn't ready for universal binaries yet, since we do
# conditional compilation based on the architecture.
#
# Don't set CMAKE_OSX_ARCHITECTURES to more than a single
# value for now.
set(LIBRESSL_CPU "${CMAKE_OSX_ARCHITECTURES}")
elseif(DEFINED CMAKE_C_COMPILER_TARGET AND
NOT CMAKE_C_COMPILER_TARGET STREQUAL "")
set(LIBRESSL_CPU "${CMAKE_C_COMPILER_TARGET}")
else()
# Fallback to the system processor.
set(LIBRESSL_CPU "${CMAKE_SYSTEM_PROCESSOR}")
endif()
endif()

message(STATUS "Target processor: ${LIBRESSL_CPU}")
message(STATUS "Target ABI: ${CMAKE_C_COMPILER_ABI}")

# Enable asserts regardless of build type
add_definitions(-UNDEBUG)

Expand Down Expand Up @@ -324,58 +346,49 @@ if(HAVE_NETINET_IP_H)
add_definitions(-DHAVE_NETINET_IP_H)
endif()

# This isn't ready for universal binaries yet, since we do conditional
# compilation based on the architecture, but this makes cross compiling for a
# single architecture work on macOS at least.
#
# Don't set CMAKE_OSX_ARCHITECTURES to more than a single value for now.
if(APPLE AND (NOT CMAKE_OSX_ARCHITECTURES STREQUAL ""))
set(CMAKE_SYSTEM_PROCESSOR "${CMAKE_OSX_ARCHITECTURES}")
endif()

if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "(aarch64|arm64|ARM64)")
if(LIBRESSL_CPU MATCHES "(aarch64|arm64|ARM64)")
set(HOST_AARCH64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm")
elseif(LIBRESSL_CPU MATCHES "arm")
set(HOST_ARM true)
elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS" AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "i386")
elseif("${CMAKE_SYSTEM_NAME}" STREQUAL "SunOS" AND LIBRESSL_CPU STREQUAL "i386")
set(HOST_X86_64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "(x86_64|amd64|AMD64)")
elseif(LIBRESSL_CPU MATCHES "(x86_64|amd64|AMD64)")
set(HOST_X86_64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "(i[3-6]86|[xX]86)")
elseif(LIBRESSL_CPU MATCHES "(i[3-6]86|[xX]86)")
set(ENABLE_ASM false)
set(HOST_I386 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "mips64")
elseif(LIBRESSL_CPU MATCHES "mips64")
set(HOST_MIPS64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "mips")
elseif(LIBRESSL_CPU MATCHES "mips")
set(HOST_MIPS true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "powerpc")
elseif(LIBRESSL_CPU MATCHES "powerpc")
set(HOST_POWERPC true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "ppc64")
elseif(LIBRESSL_CPU MATCHES "ppc64")
set(HOST_PPC64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "riscv64")
elseif(LIBRESSL_CPU MATCHES "riscv64")
set(HOST_RISCV64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "sparc64")
elseif(LIBRESSL_CPU MATCHES "sparc64")
set(HOST_SPARC64 true)
else()
set(ENABLE_ASM false)
endif()

if(ENABLE_ASM)
if("${CMAKE_C_COMPILER_ABI}" STREQUAL "ELF")
if("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "(x86_64|amd64)")
if(LIBRESSL_CPU MATCHES "(x86_64|amd64)")
set(HOST_ASM_ELF_X86_64 true)
elseif("${CMAKE_SYSTEM_PROCESSOR}" MATCHES "arm")
elseif(LIBRESSL_CPU MATCHES "arm")
set(HOST_ASM_ELF_ARMV4 true)
elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "i386")
elseif(CMAKE_SYSTEM_NAME STREQUAL "SunOS" AND LIBRESSL_CPU STREQUAL "i386")
set(HOST_ASM_ELF_X86_64 true)
endif()
add_definitions(-DHAVE_GNU_STACK)
elseif(APPLE AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
elseif(APPLE AND LIBRESSL_CPU STREQUAL "x86_64")
set(HOST_ASM_MACOSX_X86_64 true)
elseif(MSVC AND ("${CMAKE_GENERATOR}" MATCHES "Win64" OR "${CMAKE_GENERATOR_PLATFORM}" STREQUAL "x64"))
set(HOST_ASM_MASM_X86_64 true)
ENABLE_LANGUAGE(ASM_MASM)
elseif(MINGW AND "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "x86_64")
elseif(MINGW AND LIBRESSL_CPU STREQUAL "x86_64")
set(HOST_ASM_MINGW64_X86_64 true)
endif()
endif()
Expand Down