On 06/01/15 10:34, Kyle J. McKay wrote:
> The N_ macro is used to mark strings for translation without
> actually translating them. At runtime the string is expected
> to be passed to the gettext API for translation.
>
> If two N_ macro invocations appear next to each other with only
> whitespace (or nothing at all) between them, the two separate
> strings will be marked for translation, but the preprocessor
> will then combine the strings into one and at runtime the
> string passed to gettext will not match the strings that were
> translated.
>
> Avoid this by adding parentheses around the expansion of the
> N_ macro so that instead of ending up with two adjacent strings
> that are then combined by the preprocessor, two adjacent strings
> surrounded by parentheses result instead which causes a compile
> error so the mistake can be quickly found and corrected.
>
> Signed-off-by: Kyle J. McKay <mack...@gmail.com>
> ---
> This patch is optional, but prevents the problem fixed by 1/2
> from recurring.
>
> gettext.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/gettext.h b/gettext.h
> index 7671d09d..d11a4139 100644
> --- a/gettext.h
> +++ b/gettext.h
> @@ -63,6 +63,6 @@ const char *Q_(const char *msgid, const char *plu, unsigned
> long n)
> }
>
> /* Mark msgid for translation but do not translate it. */
> -#define N_(msgid) msgid
> +#define N_(msgid) (msgid)
>
> #endif
>
Hmm, see commit 642f85faa ("i18n: avoid parenthesized string as
array initializer", 07-04-2011), for a counter-point. :-P
ATB,
Ramsay Jones
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