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...nction: #include <stddef.h> size_t fsize3(int n) { char b[n+3]; // variable length array return sizeof b; // execution time sizeof } int main() { size_t size; size = fsize3(10); // fsize3 returns 13 return 0; } And I found some information with clang about VLA (http://clang.llvm.org/cxx_compatibility.html#vla) Does llvm/clang doesn't support sizeof is evaluated at run time?? thanks ching > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20100402/337df99f/attachment.html>

On Fri, Mar 19, 2010 at 3:47 PM, Chris Lattner <clattner at apple.com> wrote: > > On Mar 19, 2010, at 11:08 AM, 琬菁楊 wrote: > > > Hello Tristan and all, > > I have already know that if I want to do this feature(c -> EFI Byte code) > for GCC > I should further modify the GCC front end(parser) to solve the problem (the > size > of pointer is determined at

On Apr 1, 2010, at 1:27 PM, 琬菁楊 wrote: > int main() > { > size_t size; > size = fsize3(10); // fsize3 returns 13 > return 0; > } > And I found some information with clang about VLA > (http://clang.llvm.org/cxx_compatibility.html#vla) > Does llvm/clang doesn't support sizeof is evaluated at run time?? Yes, clang supports vlas as defined in C99 and sizeof can return a dynamic value. C99 vlas cannot occur in structs though, and clang does not support them in structs. -Chris -------------- next part -----------...