[PATCH v5] glibcextract.py: Add compile_c_snippet

[Florian Weimer]

* Adhemerval Zanella:

> It might be used on tests to check if a snippet build with the provided
> compiler and flags.
> ---
>  scripts/glibcextract.py | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/scripts/glibcextract.py b/scripts/glibcextract.py
> index 43ab58ffe2..36d204c9b0 100644
> --- a/scripts/glibcextract.py
> +++ b/scripts/glibcextract.py
> @@ -17,6 +17,7 @@
>  # License along with the GNU C Library; if not, see
>  # <https://www.gnu.org/licenses/>.
>  
> +import collections
>  import os.path
>  import re
>  import subprocess
> @@ -173,3 +174,21 @@ def compare_macro_consts(source_1, source_2, cc, macro_re, exclude_re=None,
>              if not allow_extra_2:
>                  ret = 1
>      return ret
> +
> +CompileResult = collections.namedtuple("CompileResult", "returncode output")
> +
> +def compile_c_snippet(snippet, cc, extra_cc_args=''):
> +    """Compile and return whether the SNIPPET can be build with CC along
> +       EXTRA_CC_ARGS compiler flags.  Return a CompileResult with RETURNCODE
> +       being 0 for success, or the failure value and the compiler output.
> +    """
> +    with tempfile.TemporaryDirectory() as temp_dir:
> +        c_file_name = os.path.join(temp_dir, 'test.c')
> +        obj_file_name = os.path.join(temp_dir, 'test.o')
> +        with open(c_file_name, 'w') as c_file:
> +            c_file.write(snippet + '\n')
> +        cmd = cc.split() + extra_cc_args.split() + ['-c', '-o', obj_file_name,
> +                c_file_name]
> +        r = subprocess.run(cmd, check=False, stdout=subprocess.PIPE,
> +                stderr=subprocess.STDOUT)
> +        return CompileResult(r.returncode, r.stdout)

This version looks good and works with Python 3.6.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

Thanks,
Florian