Question

In the source file (which is from a shared object / DLL), I get OKAY could not be resolved, although it is in the header. The header is in another project but I dont think that should be related, as ppackage is resolved properly ?

Update, here the source:

• foor.c a/k/a source: https://github.com/linuxrocksrulers/m5/blob/ec4f62ba1c/foor/src/foor.c#L19
• m5.h a/k/a header: https://github.com/linuxrocksrulers/m5/blob/ec4f62ba1c/m5/src/include/m5.h#L34

Build output from building foor project.

make all 
Building file: ../src/foor.c
Invoking: GCC C Compiler
gcc -I"/home/lk/proj/m5/m5/src/include" -O0 -g3 -Wall -c -fmessage-length=0 -fPIC -MMD -MP -MF"src/foor.d" -MT"src/foor.d" -o "src/foor.o" "../src/foor.c"
In file included from ../src/foor.c:9:0:
/home/lk/proj/m5/m5/src/include/m5.h:33:3: warning: #warning ohshit
../src/foor.c:12:1: warning: missing braces around initializer
../src/foor.c:12:1: warning: (near initialization for 'fs[1]')
Finished building: ../src/foor.c

Building target: libfoor.so
Invoking: GCC C Linker
gcc -shared -o "libfoor.so"  ./src/foor.o   
Finished building target: libfoor.so

header:

#include <stdio.h>

enum {
    OKAY = 0,
    ERR,
    ERRANY,
    // list shortened
    ERRNOTFOUND,
};

typedef struct { ..foobars.. } ppackage;

source file:

#include <header.h> // Did add -I ../include, where the header is

ppackage knock(ppackage *in)
{
    return OKAY; // ERROR
}

Answer 1

If you include the header, then all the code in that header could just as well have been pasted into your C source file at the point where the #include directive is.

It sounds strange that it isn’t working.

One thing to do would be to use quotes rather than angle brackets for the include, since you’re including a 3rd-party header.

Also, please include exact compiler output.