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cmake: populate CMAKE_FIND_ROOT_PATH when cross-compiling for a different architecture on Linux #1660

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cmake: populate CMAKE_FIND_ROOT_PATH when cross-compiling for a different architecture on Linux #1660

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25 changes: 25 additions & 0 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -416,6 +416,30 @@ set(COMMONLIST ${COMMONLIST} ${TINYFORMATLIST})
# Libraries
################################################################################

# Find libraries when cross-compiling for a different architecture on Linux systems.
# We purposedly do not use the `LINUX` variable for two reasons:
# - We're not testing for the target but for the system running the compiler,
# - It should exclude Android.
# Conveniently it also finds the MinGW root path when cross-compiling for Windows on Linux.
if (CMAKE_SYSTEM_NAME MATCHES "Linux")
# This code setting MACHINE_TRIPLE may be moved to DaemonCompiler.
execute_process(COMMAND "${CMAKE_CXX_COMPILER}" -dumpmachine
OUTPUT_VARIABLE MACHINE_TRIPLE
OUTPUT_STRIP_TRAILING_WHITESPACE
)

# If the target architecture has a cross-compiler subfolder, use it.
if (MACHINE_TRIPLE)
set(MACHINE_ROOT_PATH "/usr/${MACHINE_TRIPLE}")

if (NOT IS_DIRECTORY "${MACHINE_ROOT_PATH}")
unset(MACHINE_ROOT_PATH)
endif()
endif()
endif()

list(APPEND CMAKE_FIND_ROOT_PATH ${MACHINE_ROOT_PATH})

# Import external dependencies
if (DEPS_DIR)
# Warn on old version of deps
Expand Down Expand Up @@ -484,6 +508,7 @@ if (DEPS_DIR)
set(CMAKE_INCLUDE_PATH ${DEPS_DIR} ${DEPS_DIR}/include ${CMAKE_INCLUDE_PATH})
set(CMAKE_FRAMEWORK_PATH ${DEPS_DIR} ${CMAKE_FRAMEWORK_PATH})
set(CMAKE_PREFIX_PATH ${DEPS_DIR} ${CMAKE_PREFIX_PATH})

if (DAEMON_PARENT_SCOPE_DIR)
# Also set parent scope so the top level CMakeLists can find precompiled deps
set(CMAKE_FIND_ROOT_PATH ${DEPS_DIR} ${CMAKE_FIND_ROOT_PATH} PARENT_SCOPE)
Expand Down