[CMake] C++11/C++14 doesn't work in check_cxx_source_compiles

[Roman Wüger]

Hello,

 

If I use a small piece of code which uses <regex>, then it fails with
check_cxx_source_compiles. If I copy the piece of code into a file and run
the following on the command line, then it works:

 

clang++ main.cpp -std=c++14 -stdlib=libc++

 

Here is the piece of code:

 

#include <regex>

#include <string>

 

int main() {

    const std::string text = "Roses are #ff0000, other flowers have other
colors.";

    const std::regex pattern("#([a-f0-9]{2})");

 

    std::smatch match;

    std::regex_search(text, match, pattern);

 

    return 0;

}

 

I use this code in CMake as a platform check as followed:

 

# C++11 Regular Expression

set(CMAKE_REQUIRED_FLAGS "${CMAKE_CXX_FLAGS}")

check_cxx_source_compiles(

  "#include <regex>

   #include <string>

 

   int main() {

       const std::string text = \"Roses are #ff0000, other flowers have
other colors.\";

       const std::regex pattern(\"#([a-f0-9]{2})\");

 

       std::smatch match;

       std::regex_search(text, match, pattern);

 

       return 0;

   }"

  HAVE_CXX11_REGULAR_EXPRESSIONS

)

set(CMAKE_REQUIRED_FLAGS "")

 

CMakeFiles/CMakeError.log shows:

 

Undefined symbols for architecture x86_64:

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::compare(char const*) const", referenced from:

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__start_matching_list(bool) in src.o

  "std::__1::__vector_base_common<true>::__throw_length_error() const",
referenced from:

      std::__1::vector<std::__1::sub_match<char const*>,
std::__1::allocator<std::__1::sub_match<char const*> > >::assign(unsigned
long, std::__1::sub_match<char const*> const&) in src.o

      std::__1::vector<std::__1::sub_match<char const*>,
std::__1::allocator<std::__1::sub_match<char const*> > >::allocate(unsigned
long) in src.o

      void std::__1::vector<std::__1::__state<char>,
std::__1::allocator<std::__1::__state<char> >
>::__push_back_slow_path<std::__1::__state<char>
>(std::__1::__state<char>&&) in src.o

      std::__1::vector<std::__1::sub_match<char const*>,
std::__1::allocator<std::__1::sub_match<char const*> > >::__append(unsigned
long, std::__1::sub_match<char const*> const&) in src.o

      std::__1::vector<std::__1::pair<unsigned long, char const*>,
std::__1::allocator<std::__1::pair<unsigned long, char const*> >
>::__append(unsigned long) in src.o

      std::__1::vector<std::__1::pair<unsigned long, char const*>,
std::__1::allocator<std::__1::pair<unsigned long, char const*> >
>::allocate(unsigned long) in src.o

      void std::__1::vector<char, std::__1::allocator<char>
>::__push_back_slow_path<char>(char&&) in src.o

      ...

  "std::__1::__basic_string_common<true>::__throw_length_error() const",
referenced from:

      std::__1::enable_if<__is_forward_iterator<char*>::value, void>::type
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::__init<char*>(char*, char*) in src.o

      std::__1::enable_if<__is_forward_iterator<char const*>::value,
void>::type std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::__init<char const*>(char const*, char const*)
in src.o

      std::__1::enable_if<__is_forward_iterator<std::__1::__wrap_iter<char*>
>::value, void>::type std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char>
>::__init<std::__1::__wrap_iter<char*> >(std::__1::__wrap_iter<char*>,
std::__1::__wrap_iter<char*>) in src.o

  "std::__1::__match_any_but_newline<char>::__exec(std::__1::__state<char>&)
const", referenced from:

      vtable for std::__1::__match_any_but_newline<char> in src.o

  "std::__1::locale::name() const", referenced from:

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__start_matching_list(bool) in src.o

  "std::__1::locale::use_facet(std::__1::locale::id&) const", referenced
from:

      std::__1::regex_traits<char>::__init() in src.o

 
"std::__1::regex_error::regex_error(std::__1::regex_constants::error_type)",
referenced from:

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_basic_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_extended_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_assertion<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_atom<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_ERE_dupl_symbol<char const*>(char const*, char const*,
std::__1::__owns_one_state<char>*, unsigned int, unsigned int) in src.o

      bool std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<char
const*> > >(char const*, char const*, std::__1::match_results<char const*,
std::__1::allocator<std::__1::sub_match<char const*> > >&,
std::__1::regex_constants::match_flag_type, bool) const in src.o

      ...

  "std::__1::regex_error::~regex_error()", referenced from:

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_basic_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_extended_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_assertion<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_atom<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_ERE_dupl_symbol<char const*>(char const*, char const*,
std::__1::__owns_one_state<char>*, unsigned int, unsigned int) in src.o

      bool std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<char
const*> > >(char const*, char const*, std::__1::match_results<char const*,
std::__1::allocator<std::__1::sub_match<char const*> > >&,
std::__1::regex_constants::match_flag_type, bool) const in src.o

      ...

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::__init(char const*, unsigned long)", referenced
from:

      _main in src.o

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::__init(unsigned long, char)", referenced from:

      std::__1::__bracket_expression<char, std::__1::regex_traits<char>
>::__exec(std::__1::__state<char>&) const in src.o

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::reserve(unsigned long)", referenced from:

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char*>(char*, char*,
char) const in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_collating_symbol<char const*>(char const*, char const*,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >&) in src.o

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char const*>(char const*,
char const*, char) const in src.o

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::basic_string(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&)",
referenced from:

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_equivalence_class<char const*>(char const*, char const*,
std::__1::__bracket_expression<char, std::__1::regex_traits<char> >*) in
src.o

      void std::__1::vector<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::allocator<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >
>::__push_back_slow_path<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >
const&>(std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&&&) in src.o

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::~basic_string()", referenced from:

      _main in src.o

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__start_matching_list(bool) in src.o

      std::__1::__bracket_expression<char, std::__1::regex_traits<char>
>::__exec(std::__1::__state<char>&) const in src.o

      std::__1::__vector_base<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::allocator<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > >
>::~__vector_base() in src.o

      std::__1::pair<std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> >,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > >::~pair() in src.o

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::transform<char*>(char*, char*) const in src.o

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char*>(char*, char*,
char) const in src.o

      ...

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::operator=(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&)",
referenced from:

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char*>(char*, char*,
char) const in src.o

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char const*>(char const*,
char const*, char) const in src.o

  "std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >::operator=(char)", referenced from:

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_character_escape<char const*>(char const*, char const*,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_expression_term<char const*>(char const*, char const*,
std::__1::__bracket_expression<char, std::__1::regex_traits<char> >*) in
src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_class_escape<char const*>(char const*, char const*,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >&, std::__1::__bracket_expression<char,
std::__1::regex_traits<char> >*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_awk_escape<char const*>(char const*, char const*,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >*) in src.o

  "std::__1::__get_classname(char const*, bool)", referenced from:

      unsigned int std::__1::regex_traits<char>::__lookup_classname<char
const*>(char const*, char const*, bool, char) const in src.o

  "std::__1::__shared_weak_count::__add_shared()", referenced from:

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::basic_regex(std::__1::basic_regex<char, std::__1::regex_traits<char> >
const&) in src.o

  "std::__1::__shared_weak_count::__release_shared()", referenced from:

      std::__1::shared_ptr<std::__1::__empty_state<char> >::~shared_ptr() in
src.o

  "std::__1::__shared_weak_count::~__shared_weak_count()", referenced from:

      std::__1::__shared_ptr_pointer<std::__1::__empty_state<char>*,
std::__1::default_delete<std::__1::__empty_state<char> >,
std::__1::allocator<std::__1::__empty_state<char> >
>::~__shared_ptr_pointer() in src.o

  "std::__1::__get_collation_name(char const*)", referenced from:

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char*>(char*, char*,
char) const in src.o

      std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> >
std::__1::regex_traits<char>::__lookup_collatename<char const*>(char const*,
char const*, char) const in src.o

  "std::__1::ctype<char>::id", referenced from:

      std::__1::regex_traits<char>::__init() in src.o

  "std::__1::locale::locale(std::__1::locale const&)", referenced from:

 
std::__1::regex_traits<char>::regex_traits(std::__1::regex_traits<char>
const&) in src.o

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__start_matching_list(bool) in src.o

  "std::__1::locale::locale()", referenced from:

      std::__1::regex_traits<char>::regex_traits() in src.o

 "std::__1::locale::~locale()", referenced from:

      std::__1::regex_traits<char>::~regex_traits() in src.o

      std::__1::regex_traits<char>::regex_traits() in src.o

      std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__start_matching_list(bool) in src.o

  "std::__1::collate<char>::id", referenced from:

      std::__1::regex_traits<char>::__init() in src.o

  "typeinfo for std::__1::regex_error", referenced from:

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_basic_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_extended_reg_exp<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_assertion<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_atom<char const*>(char const*, char const*) in src.o

      char const* std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__parse_ERE_dupl_symbol<char const*>(char const*, char const*,
std::__1::__owns_one_state<char>*, unsigned int, unsigned int) in src.o

      bool std::__1::basic_regex<char, std::__1::regex_traits<char>
>::__match_at_start_ecma<std::__1::allocator<std::__1::sub_match<char
const*> > >(char const*, char const*, std::__1::match_results<char const*,
std::__1::allocator<std::__1::sub_match<char const*> > >&,
std::__1::regex_constants::match_flag_type, bool) const in src.o

      ...

  "typeinfo for std::__1::__shared_weak_count", referenced from:

      typeinfo for
std::__1::__shared_ptr_pointer<std::__1::__empty_state<char>*,
std::__1::default_delete<std::__1::__empty_state<char> >,
std::__1::allocator<std::__1::__empty_state<char> > > in src.o

  "vtable for std::__1::__shared_count", referenced from:

      std::__1::shared_ptr<std::__1::__empty_state<char>
>::shared_ptr<std::__1::__empty_state<char>
>(std::__1::__empty_state<char>*,
std::__1::enable_if<is_convertible<std::__1::__empty_state<char>*,
std::__1::__empty_state<char>*>::value,
std::__1::shared_ptr<std::__1::__empty_state<char> >::__nat>::type) in src.o

  NOTE: a missing vtable usually means the first non-inline virtual member
function has no definition.

  "vtable for std::__1::__shared_weak_count", referenced from:

      std::__1::shared_ptr<std::__1::__empty_state<char>
>::shared_ptr<std::__1::__empty_state<char>
>(std::__1::__empty_state<char>*,
std::__1::enable_if<is_convertible<std::__1::__empty_state<char>*,
std::__1::__empty_state<char>*>::value,
std::__1::shared_ptr<std::__1::__empty_state<char> >::__nat>::type) in src.o

  NOTE: a missing vtable usually means the first non-inline virtual member
function has no definition.

ld: symbol(s) not found for architecture x86_64

clang: error: linker command failed with exit code 1 (use -v to see
invocation)

 

** BUILD FAILED **

 

Did I forget something?

 

Thanks in advance

 

Best Regards

Roman

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