rt-thread AC6编译cstring.c和ctime.c产生编译警告comparison of nonnull parameter

KEIL5 AC6编译器编译cstring.c和ctime.c产生编译警告

compilers/common/cstring.c(194): error: nonnull parameter 'saveptr' will evaluate to 'true' on first encounter [-Werror,-Wpointer-bool-conversion] else if (saveptr && *saveptr) ^~~~~~~ ~~

ctime.c(255): error: comparison of nonnull parameter 't' equal to a null pointer is 'false' on first encounter [-Werror,-Wtautological-pointer-compare] if(t == RT_NULL || buf == RT_NULL) ^ ~~~~~~~

警告具体含义如下：

https://clang.llvm.org/docs/DiagnosticsReference.html#wpointer-bool-conversion https://clang.llvm.org/docs/DiagnosticsReference.html#wtautological-pointer-compare

警告具体位置如下：

Build Output如下

Build started: Project: project
*** Using Compiler 'V6.18', folder: 'D:\Program Files(x86)\Keil\Keil_v5\ARM\ARMCLANG\Bin'
Build target 'rt-thread'
rt-thread/components/libc/compilers/common/cstring.c(194): error: nonnull parameter 'saveptr' will evaluate to 'true' on first encounter [-Werror,-Wpointer-bool-conversion]
    else if (saveptr && *saveptr)
             ^~~~~~~ ~~
D:\Program Files(x86)\Keil\Keil_v5\ARM\ARMCLANG\Bin\..\include\string.h(283): note: declared 'nonnull' here
extern _ARMABI char *strtok_r(char * /*s1*/, const char * /*s2*/, char ** /*ptr*/) __attribute__((__nonnull__(2,3)));
                                                                                                  ^
rt-thread/components/libc/compilers/common/cstring.c(217): error: nonnull parameter 'saveptr' will evaluate to 'true' on first encounter [-Werror,-Wpointer-bool-conversion]
    if (saveptr)
    ~~  ^~~~~~~
D:\Program Files(x86)\Keil\Keil_v5\ARM\ARMCLANG\Bin\..\include\string.h(283): note: declared 'nonnull' here
extern _ARMABI char *strtok_r(char * /*s1*/, const char * /*s2*/, char ** /*ptr*/) __attribute__((__nonnull__(2,3)));
                                                                                                  ^
2 errors generated.
compiling cstring.c...
rt-thread/components/libc/compilers/common/ctime.c(255): error: comparison of nonnull parameter 't' equal to a null pointer is 'false' on first encounter [-Werror,-Wtautological-pointer-compare]
    if(t == RT_NULL || buf == RT_NULL)
       ^    ~~~~~~~
D:\Program Files(x86)\Keil\Keil_v5\ARM\ARMCLANG\Bin\..\include\time.h(171): note: declared 'nonnull' here
                               char * __restrict /*buf*/) __attribute__((__nonnull__(1,2)));
                                                                         ^
rt-thread/components/libc/compilers/common/ctime.c(255): error: comparison of nonnull parameter 'buf' equal to a null pointer is 'false' on first encounter [-Werror,-Wtautological-pointer-compare]
    if(t == RT_NULL || buf == RT_NULL)
                       ^~~    ~~~~~~~
D:\Program Files(x86)\Keil\Keil_v5\ARM\ARMCLANG\Bin\..\include\time.h(171): note: declared 'nonnull' here
                               char * __restrict /*buf*/) __attribute__((__nonnull__(1,2)));
                                                                         ^
2 errors generated.
compiling ctime.c...
".\build\keil\Obj\rt-thread.axf" - 4 Error(s), 0 Warning(s).
Target not created.
Build Time Elapsed:  00:00:01