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compiler: do not allow expansion-to-defined

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'-Wexpansion-to-defined'
     Warn whenever 'defined' is encountered in the expansion of a macro
     (including the case where the macro is expanded by an '#if'
     directive).  Such usage is not portable.  This warning is also
     enabled by '-Wpedantic' and '-Wextra'.

This is enabled by default in llvm but not in gcc. Given that it is 'not
portable', lets disallow this in gcc and keep both compilers in sync.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This commit is contained in:
Anas Nashif 2021-02-15 09:14:56 -05:00
parent c860b86822
commit c7bc6380bd
1 changed files with 3 additions and 0 deletions
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3
cmake/compiler/gcc/compiler_flags.cmake
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@ -39,6 +39,9 @@ check_set_compiler_property(APPEND PROPERTY warning_base -Wno-pointer-sign)
# Prohibit void pointer arithmetic. Illegal in C99
check_set_compiler_property(APPEND PROPERTY warning_base -Wpointer-arith)
# not portable
check_set_compiler_property(APPEND PROPERTY warning_base -Wexpansion-to-defined)
if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER "9.1.0")
set_compiler_property(APPEND PROPERTY warning_base
# FIXME: Remove once #16587 is fixed