On 2014-07-07 16:24, Joakim Hove wrote:
libstdc++ comes in a DEBUG version which is linked in when
–DGLIBCXX_DEBUG is used.
On 2014-07-07 16:33, Andreas Lauser wrote:
as a work-around for newish (>= GCC 4.9 ?) compilers, we could modify
the build system to check if std::regex is supported and if yes, use
that.
On 2014-07-07 17:14, Bård Skaflestad wrote:
Just for the record, std::regex appears to be available on GCC 4.7
too. I don't know how complete that support is, though.
std::regex is in GCC 4.6.3, too, sort of.
Note that Boost::regex follows Perl 5 conventions, whereas std::regex
follows ECMAScript conventions, so there are some subtle differences
between them, e.g.:
#include <iostream>
#include <regex>
#include <boost/regex.hpp>
int main () {
std::string filename = "foo.*";
std::string pattern = "foo\\.\\*.*?";
std::regex std_rgx (pattern);
boost::regex boost_rgx (pattern);
std::cout << "std matches: " <<
std::regex_match (filename, std_rgx) << std::endl;
std::cout << "boost matches: " <<
boost::regex_match (filename, boost_rgx) << std::endl;
return 0;
}
which on my setup (Ubuntu 12.04, GCC 4.6.3, Boost 1.46) returns
std matches: 0
boost matches: 1
(reportedly libc++ also have variations from libstdc++ in std::regex,
but I don't have the Mac running here, so I'm unable to verify that),
implying that there is possibly one more permutation to test.
On 2014-07-07 16:59, Bård Skaflestad wrote:
> Worst case, I'll build a debug-mode Boost myself.
There is good support for building with a custom Boost (I do it when I
compile with clang, for instance), so I am not sure that is the worst
case. :-)
--
Roland.
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