[cfe-users] Warnings with stdint.h?
Kumar Gala via cfe-users
cfe-users at lists.llvm.org
Thu Mar 14 10:00:41 PDT 2019
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 <peter.smith at linaro.org> 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 <kumar.gala at linaro.org> 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 <stdint.h>
>>
>> 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 uint16_t
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:376:11: warning: '__int32_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int32_c_suffix __INT32_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:301:11: note: previous definition is here
>> # define __int32_c_suffix __INT64_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:377:11: warning: '__int16_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int16_c_suffix __INT32_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:302:11: note: previous definition is here
>> # define __int16_c_suffix __INT64_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:378:11: warning: '__int8_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int8_c_suffix __INT32_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:303:12: note: previous definition is here
>> # define __int8_c_suffix __INT64_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:414:11: warning: '__int16_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int16_c_suffix __INT16_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:377:11: note: previous definition is here
>> # define __int16_c_suffix __INT32_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:415:11: warning: '__int8_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int8_c_suffix __INT16_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:378:11: note: previous definition is here
>> # define __int8_c_suffix __INT32_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:435:11: warning: '__int8_c_suffix' macro redefined [-Wmacro-redefined]
>> # define __int8_c_suffix __INT8_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:415:11: note: previous definition is here
>> # define __int8_c_suffix __INT16_C_SUFFIX__
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:569:10: warning: '__INT_LEAST32_MIN' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST32_MIN INT32_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:478:10: note: previous definition is here
>> # define __INT_LEAST32_MIN INT64_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:570:10: warning: '__INT_LEAST32_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST32_MAX INT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:479:10: note: previous definition is here
>> # define __INT_LEAST32_MAX INT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:571:10: warning: '__UINT_LEAST32_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST32_MAX UINT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:480:10: note: previous definition is here
>> # define __UINT_LEAST32_MAX UINT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:572:10: warning: '__INT_LEAST16_MIN' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST16_MIN INT32_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:481:10: note: previous definition is here
>> # define __INT_LEAST16_MIN INT64_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:573:10: warning: '__INT_LEAST16_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST16_MAX INT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:482:10: note: previous definition is here
>> # define __INT_LEAST16_MAX INT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:574:10: warning: '__UINT_LEAST16_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST16_MAX UINT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:483:10: note: previous definition is here
>> # define __UINT_LEAST16_MAX UINT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:575:10: warning: '__INT_LEAST8_MIN' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MIN INT32_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:484:10: note: previous definition is here
>> # define __INT_LEAST8_MIN INT64_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:576:10: warning: '__INT_LEAST8_MAX' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MAX INT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:485:10: note: previous definition is here
>> # define __INT_LEAST8_MAX INT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:577:10: warning: '__UINT_LEAST8_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST8_MAX UINT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:486:10: note: previous definition is here
>> # define __UINT_LEAST8_MAX UINT64_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:613:10: warning: '__INT_LEAST16_MIN' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST16_MIN INT16_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:572:10: note: previous definition is here
>> # define __INT_LEAST16_MIN INT32_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:614:10: warning: '__INT_LEAST16_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __INT_LEAST16_MAX INT16_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:573:10: note: previous definition is here
>> # define __INT_LEAST16_MAX INT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:615:10: warning: '__UINT_LEAST16_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST16_MAX UINT16_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:574:10: note: previous definition is here
>> # define __UINT_LEAST16_MAX UINT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:616:10: warning: '__INT_LEAST8_MIN' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MIN INT16_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:575:10: note: previous definition is here
>> # define __INT_LEAST8_MIN INT32_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:617:10: warning: '__INT_LEAST8_MAX' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MAX INT16_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:576:10: note: previous definition is here
>> # define __INT_LEAST8_MAX INT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:618:10: warning: '__UINT_LEAST8_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST8_MAX UINT16_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:577:10: note: previous definition is here
>> # define __UINT_LEAST8_MAX UINT32_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:635:10: warning: '__INT_LEAST8_MIN' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MIN INT8_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:616:10: note: previous definition is here
>> # define __INT_LEAST8_MIN INT16_MIN
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:636:10: warning: '__INT_LEAST8_MAX' macro redefined [-Wmacro-redefined]
>> # define __INT_LEAST8_MAX INT8_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:617:10: note: previous definition is here
>> # define __INT_LEAST8_MAX INT16_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:637:10: warning: '__UINT_LEAST8_MAX' macro redefined
>> [-Wmacro-redefined]
>> # define __UINT_LEAST8_MAX UINT8_MAX
>> ^
>> /usr/lib64/clang/7.0.1/include/stdint.h:618:10: note: previous definition is here
>> # define __UINT_LEAST8_MAX UINT16_MAX
>> ^
>> 36 warnings generated.
>> [galak at spiff zephyr]$ /usr/lib64/clang/7.0.1/include/stdint.h:
>>
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