Dear list, we came across a problem that might be very specific to our own setup and how we use the lib. We still wanted to share the patch if there is general interest.
Recent Clang versions (Starting from 20) have the __INT64_C and __UINT64_C macros built-in. The compiler does not warn about this normally because <stdint.h> is a system header. In special cases where stdint.h may be included as normal header (which is the case for our system) it does warn however. Avoid re-defining if a definition already exists. The change would not impact users that use stdint.h exclusively as system header. Best regards, - Marcus -- +++++++++++++++++++ Register now for our workshop "Get to know L4Re in 3 days" on April 8-10. Learn to design and deploy secure system architectures for your product with L4Re: https://www.kernkonzept.com/workshop-getting-started-with-l4re/ +++++++++++++++++++ Kernkonzept GmbH Sitz: Dresden HRB 31129 Geschäftsführer: Dr.-Ing. Michael Hohmuth
From d0b55797a9c2903791a151c50d9aa741661d8d61 Mon Sep 17 00:00:00 2001 From: Frank Mehnert <[email protected]> Date: Wed, 5 Mar 2025 15:26:34 +0100 Subject: [PATCH] stdint.h: don't define __INT64_C / __UINT64_C if already defined Recent Clang versions (Starting from 20) have this macro built-in. The compiler does not warn about this normally because <stdint.h> is a system header. In special cases where stdint.h may be included as normal header it does warn however. Avoid re-defining if a definition already exists. Signed-off-by: Marcus Haehnel <[email protected]> --- include/stdint.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/stdint.h b/include/stdint.h index 749f73697..5fedfb574 100644 --- a/include/stdint.h +++ b/include/stdint.h @@ -144,11 +144,19 @@ typedef unsigned long long int uintmax_t; # if __WORDSIZE == 64 +# ifndef __INT64_C # define __INT64_C(c) c ## L +# endif +# ifndef __UINT64_C # define __UINT64_C(c) c ## UL +# endif # else +# ifndef __INT64_C # define __INT64_C(c) c ## LL +# endif +# ifndef __UINT64_C # define __UINT64_C(c) c ## ULL +# endif # endif /* Limits of integral types. */ -- 2.47.1
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