52 lines
2.0 KiB
CMake
52 lines
2.0 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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zephyr_library()
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zephyr_library_sources(libc-hooks.c)
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# Do not allow LTO when compiling libc-hooks.c file
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set_source_files_properties(libc-hooks.c PROPERTIES COMPILE_OPTIONS $<TARGET_PROPERTY:compiler,prohibit_lto>)
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# Zephyr normally uses -ffreestanding, which with current GNU toolchains
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# means that the flag macros used by newlib 3.x <inttypes.h> to signal
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# support for PRI.64 macros are not present. To make them available we
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# need to hook into the include path before the system files and
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# explicitly include the newlib header that provides those macros.
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zephyr_include_directories(include)
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# LIBC_LIBRARY_DIR may or may not have been set by the toolchain. E.g. when
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# using ZEPHYR_TOOLCHAIN_VARIANT=cross-compile it will be either up to the
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# toolchain to know where it's libc implementation is, or if it is
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# unable to, it will be up to the user to specify LIBC_LIBRARY_DIR vars to
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# point to a newlib implementation.
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if(LIBC_LIBRARY_DIR)
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set(LIBC_LIBRARY_DIR_FLAG -L${LIBC_LIBRARY_DIR})
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endif()
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# Define _ANSI_SOURCE in order to prevent Newlib from defining POSIX primitives
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# in its headers when GNU dialect is used (-std=gnu*). Newlib features.h
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# defines _DEFAULT_SOURCE when __STRICT_ANSI__ is not defined by GCC (i.e. when
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# -std=gnu*), which leads to various POSIX definitions being provided by the
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# Newlib headers and conflicts with the POSIX definitions provided by Zephyr.
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zephyr_compile_definitions(_ANSI_SOURCE)
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# define __LINUX_ERRNO_EXTENSIONS__ so we get errno defines like -ESHUTDOWN
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# used by the network stack
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zephyr_compile_definitions(__LINUX_ERRNO_EXTENSIONS__)
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if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
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zephyr_link_libraries(
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${LIBC_LIBRARY_DIR_FLAG} # NB: Optional
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$<$<BOOL:${CONFIG_NEWLIB_LIBC_FLOAT_PRINTF}>:-u_printf_float>
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$<$<BOOL:${CONFIG_NEWLIB_LIBC_FLOAT_SCANF}>:-u_scanf_float>
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)
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endif()
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if(CONFIG_NEWLIB_LIBC_NANO)
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zephyr_link_libraries(
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-specs=nano.specs
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)
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zephyr_compile_options(
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-specs=nano.specs
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)
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endif()
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