Ah the bit about -isystem and suppressing warnings was good to know. For a few
cases in our build system we didn’t have -isystem for
/usr/lib64/clang/7.0.1/include.
- k
> On Mar 14, 2019, at 11:23 AM, Peter Smith wrote:
>
> Hello Kumar, (reposting as I wasn't subscribed to cfe-users).
>
> Yes I think that these warnings are expected when the clang stdint.h
> is included via -I. Normally it is included as a system header which
> suppresses the warnings (-isystem). From the comment in
> https://github.com/llvm-mirror/clang/blob/master/lib/Headers/stdint.h#L89
> it looks like the redefinitions are expected and that clang is relying
> on the warnings to be suppressed.
>
> Another way to reproduce is to turn on warnings in system headers:
> clang -c foo.c -ffreestanding -Wsystem-headers
>
> Peter
>
> On Thu, 14 Mar 2019 at 15:39, Kumar Gala wrote:
>>
>> I’m trying to build for ARM and was surprised to get warnings from the
>> stdint.h. Is this expected behavior?
>>
>> Here’s what my c file looks like:
>>
>> foo.c:
>> #include
>>
>> How I’m invoking the compiler:
>>
>> /usr/bin/clang --target=arm-none-eabi -I/usr/lib64/clang/7.0.1/include
>> -nostdinc -c foo.c
>>
>> I’m surprised to see the following warnings get generated with
>> /usr/lib64/clang/7.0.1/include/stdint.h:
>>
>> In file included from foo.c:1:
>> /usr/lib64/clang/7.0.1/include/stdint.h:186:10: warning: '__int_least32_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least32_t int32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:112:10: note: previous definition is
>> here
>> # define __int_least32_t int64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:187:10: warning: '__uint_least32_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least32_t uint32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:113:10: note: previous definition is
>> here
>> # define __uint_least32_t uint64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:188:10: warning: '__int_least16_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least16_t int32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:114:10: note: previous definition is
>> here
>> # define __int_least16_t int64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:189:10: warning: '__uint_least16_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least16_t uint32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:115:10: note: previous definition is
>> here
>> # define __uint_least16_t uint64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:190:10: warning: '__int_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least8_t int32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:116:10: note: previous definition is
>> here
>> # define __int_least8_t int64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:191:10: warning: '__uint_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least8_t uint32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:117:10: note: previous definition is
>> here
>> # define __uint_least8_t uint64_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:219:10: warning: '__int_least16_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least16_t int16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:188:10: note: previous definition is
>> here
>> # define __int_least16_t int32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:220:10: warning: '__uint_least16_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least16_t uint16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:189:10: note: previous definition is
>> here
>> # define __uint_least16_t uint32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:221:10: warning: '__int_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least8_t int16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:190:10: note: previous definition is
>> here
>> # define __int_least8_t int32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:222:10: warning: '__uint_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least8_t uint16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:191:10: note: previous definition is
>> here
>> # define __uint_least8_t uint32_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:238:10: warning: '__int_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __int_least8_t int8_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:221:10: note: previous definition is
>> here
>> # define __int_least8_t int16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:239:10: warning: '__uint_least8_t'
>> macro redefined [-Wmacro-redefined]
>> # define __uint_least8_t uint8_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:222:10: note: previous definition is
>> here
>> # define __uint_least8_t ui
