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# Check for various compiler extensions
# HAVE_ATTRIBUTE_ALWAYS_INLINE True if attribute always inline is supported
# HAS_ATTRIBUTE_UNUSED True if attribute unused is supported
# HAS_ATTRIBUTE_DEPRECATED True if attribute deprecated is supported
# HAS_ATTRIBUTE_DEPRECATED_MSG True if attribute deprecated("msg") is supported
include(CheckCXXSourceCompiles)
# __attribute__((always_inline))
CHECK_CXX_SOURCE_COMPILES("
void __attribute__((always_inline)) foo(void) {}
int main(void)
{
foo();
return 0;
};
" HAVE_ATTRIBUTE_ALWAYS_INLINE
)
# __attribute__((unused))
CHECK_CXX_SOURCE_COMPILES("
int main(void)
{
int __attribute__((unused)) foo;
return 0;
};
" HAS_ATTRIBUTE_UNUSED
)
# __attribute__((deprecated))
CHECK_CXX_SOURCE_COMPILES("
#define DEP __attribute__((deprecated))
class bar
{
bar() DEP;
};
class peng { } DEP;
template <class T>
class t_bar
{
t_bar() DEP;
};
template <class T>
class t_peng {
t_peng() {};
} DEP;
void foo() DEP;
void foo() {};
int main(void)
{
return 0;
};
" HAS_ATTRIBUTE_DEPRECATED
)
# __attribute__((deprecated("msg")))
CHECK_CXX_SOURCE_COMPILES("
#define DEP __attribute__((deprecated(\"message\")))
class bar {
bar() DEP;
};
class peng { } DEP;
template <class T>
class t_bar
{
t_bar() DEP;
};
template <class T>
class t_peng
{
t_peng() {};
} DEP;
void foo() DEP;
void foo() {};
int main(void)
{
return 0;
};
" HAS_ATTRIBUTE_DEPRECATED_MSG
)
if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
list(APPEND ${project}_LIBRARIES stdc++fs)
endif()
endif()
option(OPM_CLANG_WITH_STDC++FS "Using libstdc++ with clang and we want to link to stdc++fs" OFF)
if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang" AND OPM_CLANG_WITH_STDC++FS)
list(APPEND ${project}_LIBRARIES stdc++fs)
endif()
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