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| author | Vasili Galka <vvv444@gmail.com> | 2014-08-14 14:42:05 (GMT) |
|---|---|---|
| committer | Thomas Chou <thomas@wytron.com.tw> | 2014-08-24 03:27:31 (GMT) |
| commit | 00a2517fcb5159ed016b25130184638b1dbf2f02 (patch) | |
| tree | 053a5d5a0674d99458d4f6e437a2b1b53253031b | |
| parent | 7f6b8315d18f683c5181d0c3694818c1b2a20dcd (diff) | |
| download | u-boot-00a2517fcb5159ed016b25130184638b1dbf2f02.tar.xz | |
nios2: Fix printf size_t format related warnings (again...)
When compiling the current code on GCC 4.8.3, the following warnings
appear:
warning: format '%zu' expects argument of type 'size_t', but argument
2 has type 'long unsigned int' [-Wformat=]
There were many mails about such warnings on different architectures.
This patch limits itself to the nios2 architecture.
The problem is that for the size_t (%zu, %zd, ...) arguments of
printf GCC does not verify the type match to size_t type. It verifies
the type match to the compiler-defined __SIZE_TYPE__ type. Thus, if
size_t is defined different from __SIZE_TYPE__ - warnings inevitably
appear.
There is a comment by Thomas Chou to the (rejected) patch:
http://patchwork.ozlabs.org/patch/272102/
which explains that the older GCC toolchains (gcc-3.4.6 and gcc-4.1.2)
expect size_t to be "unsigned long" and the newer expect it to be
"unsigned int". Thus, no matter how we define size_t - either way
warnings appear when using some GCC version.
By rejecting that patch, a choice was made to prefer older GCC versions
and leave the warnings when building with the newer toolchains.
Personally, I disagree with this choice...
In any case, this patch proposes a way to fix the warnings for any GCC
version. Just define size_t using the __SIZE_TYPE__ compiler-defined
type and the type verification will pass.
I tested that this fixes the warning on GCC 4.8.3. I don't have an
older toolchain to test with, but __SIZE_TYPE__ was definitely defined
in GCC 3.4.6, so it should work there too.
Signed-off-by: Vasili Galka <vvv444@gmail.com>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
| -rw-r--r-- | arch/nios2/include/asm/posix_types.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/nios2/include/asm/posix_types.h b/arch/nios2/include/asm/posix_types.h index 6733640..6b6c39b 100644 --- a/arch/nios2/include/asm/posix_types.h +++ b/arch/nios2/include/asm/posix_types.h @@ -16,7 +16,11 @@ typedef int __kernel_pid_t; typedef unsigned short __kernel_ipc_pid_t; typedef unsigned short __kernel_uid_t; typedef unsigned short __kernel_gid_t; +#ifdef __GNUC__ +typedef __SIZE_TYPE__ __kernel_size_t; +#else typedef unsigned long __kernel_size_t; +#endif typedef long __kernel_ssize_t; typedef int __kernel_ptrdiff_t; typedef long __kernel_time_t; |