On Wed, Aug 08, 2007 at 10:16:18AM +0200, Luca Dionisi wrote: > On 8/8/07, John W. Eaton <jwe@xxxxxxxxxxxxxxxxx> wrote: > > On 7-Aug-2007, Joshua Hoblitt wrote: > > > > | Is there a pre-canned AC macro or other reliable means of testing for > > | compiler attributes? > > | > > | I have an awful lot of code that looks something like this: > > | > > | void *myfunc(char *myvar > > | #ifdef __GNUC__ > > | ) __attribute__((malloc)); > > | # else // ifdef __GNUC__ > > | ); > > | #endif // ifdef __GNUC__ > > | > > | and it has to the potential to get a lot worse if I have to start testing > > | for what version of GNUC we have to use a new attribute. > > > > Ugh. Don't do it like that. Instead, write something like > > > > your-config-header.h: > > -------------------- > > #ifdef __GNUC__ > > #define ATTR_MALLOC __attribute__((malloc)) > > #else > > #define ATTR_MALLOC > > #endif > > > > and then in your code, just use > > > > #include "your-config-header.h" > > ... > > void *myfunc (char *myvar) ATTR_MALLOC; > > > > You may still want some autoconf macros to check whether the > > attributes are supported, but with this style it won't be so messy > > since the cpp #ifdefs only have to appear in one place. > > > > jwe > > > > > > _______________________________________________ > > Autoconf mailing list > > Autoconf@xxxxxxx > > http://lists.gnu.org/mailman/listinfo/autoconf > > > > Isn't that already provided? > > I can read these 2 lines > > ax_gcc_malloc_call > defines GCC_MALLOC_CALL to __attribute__((__malloc__)) if ok Perfect! Thanks. -J --
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