On Fri, Jun 8, 2012 at 5:14 PM, Andrew Haley <aph@xxxxxxxxxx> wrote: > [Redirect to gcc-help] > > On 06/08/2012 09:54 AM, Bin.Cheng wrote: >> In micro-controller applications, code size is critical and the size >> problem is worse if library is linked. >> For example, most c programs call printf to format output data, that >> means floating point code get linked even the program only want to >> output non-floating point numbers. Currently, we rely on end-user to >> call iprintf if the program does not want floating point. >> >> I noticed that GCC now can check format string of printf functions, so >> I am wondering if it is possible to take advantage of this utility, by >> making gcc detect whether printf prints floating point number and then >> generate assembly directive in backend to pull in floating point >> functions only if necessary. > > It wouldn't be at all difficult, but you'd have to change gcc. > Thanks Andrew. How about the question: The check is done in front end, so how should I expose the check result to back-end. Is there any hook utility? Thanks. -- Best Regards.
