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Fix #338, Update RTEMS CMake Platform File #339

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merged 1 commit into from May 19, 2022
Merged

Fix #338, Update RTEMS CMake Platform File #339

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57 changes: 33 additions & 24 deletions cmake/Modules/Platform/RTEMS.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -24,45 +24,54 @@ set(CMAKE_SHARED_LIBRARY_CXX_FLAGS "")
set(CMAKE_SHARED_MODULE_C_FLAGS "")
set(CMAKE_SHARED_MODULE_CXX_FLAGS "")

# Set the CMAKE_EXE_EXPORTS_C_FLAG which is for executables
# using dynamic loading/linking
set(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")


# Include the system specs directly within the COMPILE_OBJECT definitions
# This way it does not need to be done via CMAKE_C_FLAGS and it simplifies
# the process in general.
set(RTEMS_SYS_SPECS_FLAGS "-B${RTEMS_TARGET_PATH}/${RTEMS_BSP}/lib -specs bsp_specs -qrtems")
# Note that the specs vary between RTEMS 5, RTEMS 6, and the Gaisler RCC version of RTEMS 5
# These differences are accounted for in the toolchain file in the RTEMS_BSP_SPECS macro
set(RTEMS_SYS_SPECS_FLAGS "-B${RTEMS_TARGET_PATH}/${RTEMS_BSP}/lib ${RTEMS_BSP_SPECS_FLAGS} -qrtems")

# Basic command templates for compiling C and C++ code
set(CMAKE_C_COMPILE_OBJECT "<CMAKE_C_COMPILER> <DEFINES> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_C_FLAGS} <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")
set(CMAKE_CXX_COMPILE_OBJECT "<CMAKE_CXX_COMPILER> <DEFINES> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_CXX_FLAGS} <INCLUDES> <FLAGS> -o <OBJECT> -c <SOURCE>")


# This creates a simple relocatable object file, not a shared library
set(CMAKE_SHARED_OBJECT_LINKER_FLAGS -r)
set(CMAKE_C_CREATE_SHARED_MODULE "<CMAKE_LINKER> <LINK_FLAGS> -o <TARGET> ${CMAKE_SHARED_OBJECT_LINKER_FLAGS} <OBJECTS> <LINK_LIBRARIES>")
set(CMAKE_CXX_CREATE_SHARED_MODULE ${CMAKE_C_CREATE_SHARED_MODULE})
set(CMAKE_C_CREATE_SHARED_LIBRARY ${CMAKE_C_CREATE_SHARED_MODULE})
set(CMAKE_CXX_CREATE_SHARED_LIBRARY ${CMAKE_C_CREATE_SHARED_MODULE})

# Additional link flags for entry point and relocation address
# RTEMS uses "Init" rather than "main" as its entry point
# This flag ensures that the Init symbol is not dropped at link time.
set(RTEMS_SYS_LINKFLAGS "-u Init")
if (RTEMS_RELOCADDR)
set(RTEMS_SYS_LINKFLAGS "${RTEMS_SYS_LINKFLAGS} -Wl,-Ttext,${RTEMS_RELOCADDR}")
endif (RTEMS_RELOCADDR)

# The link procedure to support dynamic loading using the RTEMS dlopen()
# First create a "prelink" executable using a typical link procedure
# Then run "rtems-syms" and re-link the output into a final executable
set(CMAKE_C_LINK_EXECUTABLE
"<CMAKE_C_COMPILER> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_C_FLAGS} <FLAGS> ${RTEMS_SYS_LINKFLAGS} -o <TARGET>-prelink <OBJECTS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>"
"${RTEMS_TOOLS_PREFIX}/bin/rtems-syms -v -e -c ${RTEMS_BSP_C_FLAGS} -C <CMAKE_C_COMPILER> -o <TARGET>-dl-sym.o <TARGET>-prelink"
"<CMAKE_C_COMPILER> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_C_FLAGS} <FLAGS> ${RTEMS_SYS_LINKFLAGS} -o <TARGET> <TARGET>-dl-sym.o <OBJECTS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>")

set(RTEMS_TARGET_PATH
# If RTEMS_DYNAMIC_LOAD is defined in the toolchain file, the executable will be a loadable object
# similar to vxWorks. This allows the system to be built, then loaded on an RTEMS runtime image using
# the RTEMS dynamic loader
# If RTEMS_DYNAMIC_LOAD is not defined, then a traditional linked executable will be created.
if(RTEMS_DYNAMIC_LOAD)
# Dynamic load is just a shared library
set(CMAKE_C_LINK_EXECUTABLE "<CMAKE_LINKER> <LINK_FLAGS> -o <TARGET> ${CMAKE_SHARED_OBJECT_LINKER_FLAGS} <OBJECTS> <LINK_LIBRARIES>")
else()
# Set the CMAKE_EXE_EXPORTS_C_FLAG which is for executables
# using dynamic loading/linking
set(CMAKE_EXE_EXPORTS_C_FLAG "-Wl,--export-dynamic")

# Additional link flags for entry point and relocation address
# RTEMS uses "Init" rather than "main" as its entry point
# This flag ensures that the Init symbol is not dropped at link time.
set(RTEMS_SYS_LINKFLAGS "-u Init")
if (RTEMS_RELOCADDR)
set(RTEMS_SYS_LINKFLAGS "${RTEMS_SYS_LINKFLAGS} -Wl,-Ttext,${RTEMS_RELOCADDR}")
endif (RTEMS_RELOCADDR)

# The link procedure to support dynamic loading using the RTEMS dlopen()
# First create a "prelink" executable using a typical link procedure
# Then run "rtems-syms" and re-link the output into a final executable
set(CMAKE_C_LINK_EXECUTABLE
"<CMAKE_C_COMPILER> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_C_FLAGS} <FLAGS> ${RTEMS_SYS_LINKFLAGS} -o <TARGET>-prelink <OBJECTS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>"
"${RTEMS_TOOLS_PREFIX}/bin/rtems-syms -v -e -c ${RTEMS_BSP_C_FLAGS} -C <CMAKE_C_COMPILER> -o <TARGET>-dl-sym.o <TARGET>-prelink"
"<CMAKE_C_COMPILER> ${RTEMS_SYS_SPECS_FLAGS} ${RTEMS_BSP_C_FLAGS} <FLAGS> ${RTEMS_SYS_LINKFLAGS} -o <TARGET> <TARGET>-dl-sym.o <OBJECTS> <CMAKE_C_LINK_FLAGS> <LINK_FLAGS> <LINK_LIBRARIES>")
endif(RTEMS_DYNAMIC_LOAD)

SET(RTEMS_TARGET_PATH
"${RTEMS_BSP_PREFIX}/${CMAKE_SYSTEM_PROCESSOR}-rtems${CMAKE_SYSTEM_VERSION}")

set(RTEMS_TOOLS_PATH
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