[cfe-dev] Libc++ locale tests

Ruben Van Boxem vanboxem.ruben at gmail.com
Sun Oct 2 11:23:53 PDT 2011

Hi Howard and others,

I am struggling to get the locale related tests in libc++ working like they
should. In attached patch I added a header in the main test directory,
defining the locale names for Windows and the rest. I replaced all
occurrences of the name in a test's source code with an include to this file
and the macro I defined. For every platform != windows, this should come
down to the same thing. for Windows, I could not use UTF-8 locales, as they
are unsupported and always return 0 when trying to setlocale or newlocale
(_create_locale). The patch also fixes a bad #endif placement (if I'm not
mistaken) in

The patch fixed exceptions being thrown because of bad locale names, but not
the test's failures. To compare, I used this test code (freely adapted to
resemble the true test):

and tried to run the test on MSVC10 and its STL. It compiles, but the
asserts fail, as all values are 0. GCC 4.6.1+stdlibc++ isn't capable of
compiling this code: it's missing the function std::get_time for some
reason. These kinds of unexplained failures are present across the board.
Their causes seem either unrelated or hidden in the same place in
locale-code not yet fixed for Windows. The fact remains that MSVC10, which
has the above function, fails the test, which makes me think the input
character buffer needs to be in different format.

I plan on adding floating point number macros (which create a string with
the expected format from a base and exponent) to this header as well:
FLOAT_MACRO(1234.1234, -56)
would become
"1234.1234" "e" "-" "56"
"1234.1234" "e" "-" "0" "56"
(implicitely letting the compiler concatenate the string literals) or
whatever depending on what it is on that platform. I think this will solve
the locale related numerics failures.

The attached patch got rid of only two test failures (438 to 436), but as I
said, at least the locales are being constructed properly, and the remaining
failures are due to something else now.

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