146e22fca4
Although xt-clang is based on clang, for some reason, it still lists xcc system include path as the first search path (e.g. for stddef.h), and the clang system include path as last. This creates a big issue when the code starts to use any standards past C89 (since xcc is based on GCC 4.2). We can use compiler property nostdin_include to add -isystem to compiler options. However, some modules (e.g. picolibcs) somehow ignore this. So we also need to forcibly do add_compile_options() to make sure the clang system include path is placed before the xcc system include path. Signed-off-by: Daniel Leung <daniel.leung@intel.com>
30 lines
1.2 KiB
CMake
30 lines
1.2 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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include(${ZEPHYR_BASE}/cmake/compiler/clang/compiler_flags.cmake)
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# nostdinc needs to be cleared as it is needed for xtensa/config/core.h.
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# nostdinc_include contains path to llvm headers.
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set_compiler_property(PROPERTY nostdinc)
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set_compiler_property(APPEND PROPERTY nostdinc_include ${NOSTDINC})
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if($ENV{XCC_NO_G_FLAG})
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# Older xcc/clang cannot use "-g" due to this bug:
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# https://bugs.llvm.org/show_bug.cgi?id=11740.
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# Clear the related flag(s) here so it won't cause issues.
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set_compiler_property(PROPERTY debug)
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endif()
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# Clang version used by Xtensa does not support -fno-pic and -fno-pie
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set_compiler_property(PROPERTY no_position_independent "")
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# Remove after testing that -Wshadow works
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set_compiler_property(PROPERTY warning_shadow_variables)
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# xt-clang is usually based on older version of clang, and
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# Zephyr main targets more recent versions. Because of this,
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# some newer compiler flags may cause warnings where twister
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# would mark as test being failed. To workaround that,
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# add -Wno-unknown-warning-option to suppress those warnings.
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check_set_compiler_property(APPEND PROPERTY warning_extended
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-Wno-unknown-warning-option
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)
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