Build issues with all warnings and pedantic defined

[skliper]

Describe the bug
With "-Wall -Wstrict-prototypes -std=c99 -pedantic -Wcast-align" defined, multiple issues observed:

[ 14%] Building C object tools/cFS-GroundSystem/Subsystems/cmdUtil/CMakeFiles/cmdUtil.dir/cmdUtil.c.o
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/cmdUtil.c: In function ‘main’:
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/cmdUtil.c:507:17: warning: overflow in implicit constant conversion [-Woverflow]
     tempShort = 0xC000; /* Sequence word. */
                 ^
[ 28%] Building C object tools/cFS-GroundSystem/Subsystems/cmdUtil/CMakeFiles/cmdUtil.dir/SendUdp.c.o
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c: In function ‘SendUdp’:
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:55:25: error: storage size of ‘hints’ isn’t known
     struct addrinfo     hints;
                         ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:78:30: error: invalid application of ‘sizeof’ to incomplete type ‘struct addrinfo’
     memset(&hints, 0, sizeof(struct addrinfo));
                              ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:81:25: error: ‘AI_CANONNAME’ undeclared (first use in this function)
     hints.ai_flags    = AI_CANONNAME;
                         ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:81:25: note: each undeclared identifier is reported only once for each function it appears in
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:84:15: warning: implicit declaration of function ‘getaddrinfo’ [-Wimplicit-function-declaration]
     errcode = getaddrinfo(hostname, portNum, &hints, &result);
               ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:89:63: error: dereferencing pointer to incomplete type ‘struct addrinfo’
     printf("sending data to '%s' (IP : %s); port %d\n", result->ai_canonname,
                                                               ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:132:9: warning: implicit declaration of function ‘freeaddrinfo’ [-Wimplicit-function-declaration]
         freeaddrinfo(result);
         ^
/home/jhageman/cFS/cFS-GitHub/tools/cFS-GroundSystem/Subsystems/cmdUtil/SendUdp.c:55:25: warning: unused variable ‘hints’ [-Wunused-variable]
     struct addrinfo     hints;
                         ^

To Reproduce
Steps to reproduce the behavior:

1. add_definitions("-Wall -Wstrict-prototypes -std=c99 -pedantic -Wcast-align") to mission_build.cmake prepare function
2. make prep and make

Expected behavior
Clean build

Code snips
N/A

System observed on:

• Hardware: cFS Dev Server
• OS: Ubuntu 16.04
• Versions: master bundle

Additional context
N/A

Reporter Info
Jacob Hageman - NASA/GSFC

[skliper]

User error on everything except the first warning, was missing -D_XOPEN_SOURCE=600 flag.