How to printf uint64 t Fails with spurious trailing in format

Question

I wrote a very simple test code of printf uint64 t    include  lt inttypes h gt   include  lt stdio h gt   int main       uint64 t ui64   90    printf  test uint64 t      PRIu64   n   ui64     return 0      I use ubuntu 11 10  64 bit  and gcc version 4 6 1 to compile it  but failed   main cpp  In function    int main       main cpp 9 30  error  expected         before    PRIu64    main cpp 9 47  warning  spurious trailing         in format  -Wformat

User · Answer

Since you ve included the C   tag  you could use the  fmt  library and avoid the PRIu64 macro and other printf issues altogether    include  lt fmt core h gt   int main       uint64 t ui64   90    fmt  print  test uint64 t      n   ui64       The formatting facility based on this library is proposed for standardization in C  20  P0645   Disclaimer  I m the author of  fmt

User · Answer

When compiling memcached under Centos 5 x i got the same problem   The solution is to upgrade gcc and g   to version 4 4 at least   Make sure your CC CXX is set  exported  to right binaries before compiling

User · Answer

The ISO C99 standard specifies that these macros must only be defined if explicitly requested    define   STDC FORMAT MACROS  include  lt inttypes h gt       now PRIu64 will work

[c++] How to printf uint64_t? Fails with: "spurious trailing ‘%’ in format"

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