LTTng » LTTng-tools

(Note that the error most likely stems from userspace-rcu, but as it surfaces here, I'm filing it against lttng-tools.)

Steps to reproduce:

• Configure userspace-rcu with the --disable-compiler-tls flag
• Compile lttng-tools against it

The process will eventually fail, in the compilation of src/common/error.c file:

error.c: In function 'log_add_time':
error.c:52:62: error: 'error_log_time' undeclared (first use in this function)
ret = snprintf(URCU_TLS(error_log_time).str, sizeof(error_log_time.str),
^
error.c:52:62: note: each undeclared identifier is reported only once for each function it appears in

The reason appears to be that for the above urcu configuration, the

DEFINE_URCU_TLS(struct log_time, error_log_time);

line (error.c:30) won't actually define a variable of name 'error_log_time', and thus error.c:52 will fail.