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lib: newlib: Define _ANSI_SOURCE #52740

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Dec 5, 2022
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lib: newlib: Define _ANSI_SOURCE #52740

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7 changes: 7 additions & 0 deletions lib/libc/newlib/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,13 @@ if(LIBC_LIBRARY_DIR)
set(LIBC_LIBRARY_DIR_FLAG -L${LIBC_LIBRARY_DIR})
endif()

# Define _ANSI_SOURCE in order to prevent Newlib from defining POSIX primitives
# in its headers when GNU dialect is used (-std=gnu*). Newlib features.h
# defines _DEFAULT_SOURCE when __STRICT_ANSI__ is not defined by GCC (i.e. when
# -std=gnu*), which leads to various POSIX definitions being provided by the
# Newlib headers and conflicts with the POSIX definitions provided by Zephyr.
zephyr_compile_definitions(_ANSI_SOURCE)

# define __LINUX_ERRNO_EXTENSIONS__ so we get errno defines like -ESHUTDOWN
# used by the network stack
zephyr_compile_definitions(__LINUX_ERRNO_EXTENSIONS__)
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