Author: Aaron Ballman Date: 2025-03-07T09:51:33-05:00 New Revision: d1bd1c7e825d190fc47cd06956c381cc0f70fba8
URL: https://github.com/llvm/llvm-project/commit/d1bd1c7e825d190fc47cd06956c381cc0f70fba8 DIFF: https://github.com/llvm/llvm-project/commit/d1bd1c7e825d190fc47cd06956c381cc0f70fba8.diff LOG: [C2y] Claim conformance to WG14 N3496 This was a clarification for C23's N2412, primarily about the BOOL_WIDTH macro. It should expand to the number of bits in the value representation, not the object representation. Clang 20 implements the correct value. Added: clang/test/C/C2y/n3496.c Modified: clang/www/c_status.html Removed: ################################################################################ diff --git a/clang/test/C/C2y/n3496.c b/clang/test/C/C2y/n3496.c new file mode 100644 index 0000000000000..74b8880b8ca19 --- /dev/null +++ b/clang/test/C/C2y/n3496.c @@ -0,0 +1,17 @@ +// RUN: %clang_cc1 -verify -std=c2y -ffreestanding %s +// RUN: %clang_cc1 -verify -std=c23 -ffreestanding %s + +/* WG14 N3496: Clang 20 + * Clarify the specification of the width macros + * + * C23 N2412 mandated a two's complement sign representation for integers, and + * added *_WIDTH macros for all of the various integer types. There was + * confusion as to whether BOOL_WIDTH specified the minimum number of bits or + * an exact number of bits. N3496 clarified that it's an exact number of bits. + */ +// expected-no-diagnostics + +#include <limits.h> + +static_assert(BOOL_WIDTH == 1); + diff --git a/clang/www/c_status.html b/clang/www/c_status.html index b72b96dd598b5..f9dc3a48654c7 100644 --- a/clang/www/c_status.html +++ b/clang/www/c_status.html @@ -319,7 +319,7 @@ <h2 id="c2y">C2y implementation status</h2> <tr> <td>Clarify the specification of the width macros</td> <td><a href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3496.htm";>N3496</a></td> - <td class="unknown" align="center">Unknown</td> + <td class="full" align="center">Clang 20</td> </tr> <tr> <td>Complex operators</td> _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
