clang -O2   -Wall -Wextra -Werror=implicit-function-declaration mqueue/mq_setattr.c -o mqueue/mq_setattr -D_GNU_SOURCE -D_BSD_SOURCE -D_ALL_SOURCE -D_DEFAULT_SOURCE  -lm   -lintl
mqueue/mq_setattr.c:110:21: warning: & has lower precedence than !=; != will be evaluated first [-Wparentheses]
        if ( attr.mq_flags & O_NONBLOCK != 0 )
                           ^~~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:110:21: note: place parentheses around the '!=' expression to silence this warning
        if ( attr.mq_flags & O_NONBLOCK != 0 )
                           ^ ~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:110:21: note: place parentheses around the & expression to evaluate it first
        if ( attr.mq_flags & O_NONBLOCK != 0 )
             ~~~~~~~~~~~~~~^~~~~~~~~~~~
mqueue/mq_setattr.c:128:25: warning: & has lower precedence than !=; != will be evaluated first [-Wparentheses]
        if ( old_attr.mq_flags & O_NONBLOCK != 0 )
                               ^~~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:128:25: note: place parentheses around the '!=' expression to silence this warning
        if ( old_attr.mq_flags & O_NONBLOCK != 0 )
                               ^ ~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:128:25: note: place parentheses around the & expression to evaluate it first
        if ( old_attr.mq_flags & O_NONBLOCK != 0 )
             ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
mqueue/mq_setattr.c:139:27: warning: & has lower precedence than !=; != will be evaluated first [-Wparentheses]
        if ( final_attr.mq_flags & O_NONBLOCK != O_NONBLOCK )
                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:139:27: note: place parentheses around the '!=' expression to silence this warning
        if ( final_attr.mq_flags & O_NONBLOCK != O_NONBLOCK )
                                 ^ ~~~~~~~~~~~~~~~~~~~~~~~~
mqueue/mq_setattr.c:139:27: note: place parentheses around the & expression to evaluate it first
        if ( final_attr.mq_flags & O_NONBLOCK != O_NONBLOCK )
             ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
3 warnings generated.
../out/minix/basic/mqueue/mq_setattr.o: In function `main':
mqueue/mq_setattr.c:(.text+0x4e3): undefined reference to `mq_open'
mqueue/mq_setattr.c:(.text+0x52d): undefined reference to `mq_getattr'
mqueue/mq_setattr.c:(.text+0x5b1): undefined reference to `mq_setattr'
mqueue/mq_setattr.c:(.text+0x5f5): undefined reference to `mq_getattr'
../out/minix/basic/mqueue/mq_setattr.o: In function `cleanup':
mqueue/mq_setattr.c:(.text+0x7ab): undefined reference to `mq_unlink'
../out/minix/basic/mqueue/mq_setattr.o: In function `on_signal':
mqueue/mq_setattr.c:(.text+0x8bf): undefined reference to `mq_unlink'
clang: error: linker command failed with exit code 1 (use -v to see invocation)