From 06bb96a82c2a5eae8547c517e899e30f300898e6 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C5=81ukasz=20Stelmach?= Date: Thu, 10 Jul 2025 13:52:28 +0200 Subject: [PATCH] [aapcs64] Change size_t and ptrdiff_t definitions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The current definition[1] of `size_t` as `unsigned long` causes many problems with recent versions of gcc and glibc[*] and other software packages. When `size_t` is defined link this gcc issues warnings/errors when a pointer to a `size_t` variable is to be assigned to a `uint32_t *` variable (`uint32_t` is defined[2][3] as `unsigned int`) even though both `unsigned long int` and `unsigned int` are the same size (4 bytes). Two other ILP32 ABIs supported in the gcc and glibc (i.e. MIPS n32[4] and Intel x32[5]) define `size_t` as `unsigned int`. [1] https://github.com/ARM-software/abi-aa/blob/ee6b627a58988b56a761d1a3d545fc01b9b78241/aapcs64/aapcs64.rst?plain=1#L2954 [2] https://sourceware.org/git?p=glibc.git;a=blob;f=posix/bits/types.h;hb=d6c2760ef7f7cdeab912767f04db4b14632fbb5f#l42 [3] https://sourceware.org/git?p=glibc.git;a=blob;f=bits/stdint-uintn.h;hb=d6c2760ef7f7cdeab912767f04db4b14632fbb5f#l26 [4] https://gcc.gnu.org/git?p=gcc.git;a=blob;f=gcc/config/mips/mips.h;hb=2f2e9bcfb0fd9cbf46e2d0d03b3f32f7df8d4fff#l3112 [5] https://gcc.gnu.org/git?p=gcc.git;a=blob;f=gcc/config/i386/x86-64.h;hb=2f2e9bcfb0fd9cbf46e2d0d03b3f32f7df8d4fff#l40 [*] both need to be patched to support ILP32, but the problems creep into more platform independent code Signed-off-by: Łukasz Stelmach --- aapcs64/aapcs64.rst | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/aapcs64/aapcs64.rst b/aapcs64/aapcs64.rst index 191f103f..ab708142 100644 --- a/aapcs64/aapcs64.rst +++ b/aapcs64/aapcs64.rst @@ -2951,9 +2951,9 @@ Both C and C++ require that a system provide additional type definitions that ar +-----------------+------------------+----------------+---------------------+ | Typedef | ILP32 **(Beta)** | LP64 | LLP64 | +=================+==================+================+=====================+ - | ``size_t`` | unsigned long | unsigned long | unsigned long long | + | ``size_t`` | unsigned int | unsigned long | unsigned long long | +-----------------+------------------+----------------+---------------------+ - | ``ptrdiff_t`` | signed long | signed long | signed long long | + | ``ptrdiff_t`` | signed int | signed long | signed long long | +-----------------+------------------+----------------+---------------------+ Definition of va\_list