|Summary:||Per C11 and C++11, <stdint.h> should not look at __STDC_LIMIT_MACROS or __STDC_CONSTANT_MACROS|
|Product:||glibc||Reporter:||Richard Smith <richard>|
|Component:||libc||Assignee:||Paul Pluzhnikov <ppluzhnikov>|
|Severity:||normal||CC:||drepper.fsp, fweimer, ondra, ppluzhnikov|
Description Richard Smith 2013-04-13 00:32:50 UTC
glibc's <stdint.h> follows C99, which says that in C++, certain macros should only be defined if __STDC_LIMIT_MACROS or __STDC_CONSTANT_MACROS is defined. However, the C++ committee decided that they didn't want this behavior, and explicitly overruled this in the C++11 standard (the first to provide <stdint.h>). Consequently C11 removed these rules. glibc has not been updated to follow the C11 rules, and still checks for those macros being defined in C++ mode. C++ implementations are currently working around this by wrapping glibc's <stdint.h> with one which defines these macros first. These workarounds should not be necessary; glibc should simply not be checking for these macros. Fix would be to remove these lines from sysdeps/generic/stdint.h: /* The ISO C99 standard specifies that in C++ implementations these macros should only be defined if explicitly requested. */ #if !defined __cplusplus || defined __STDC_LIMIT_MACROS ... plus the corresponding #endif and the corresponding lines for __STDC_CONSTANT_MACROS.
Comment 1 Paul Pluzhnikov 2013-04-15 23:32:47 UTC
Google ref: b/8607032 Proposed patch: http://sourceware.org/ml/libc-alpha/2013-04/msg00473.html
Comment 2 OndrejBilka 2013-05-21 14:17:33 UTC
Was according to http://sourceware.org/ml/libc-alpha/2013-04/msg00677.html commited.