Can't compile Hello, world! program using installed C driver

Working with Data Drivers
1

The version of the driver you are trying to build (branch or tag).
~ Apparently, successfully built. Version 1.22.0

Host OS, version, and architecture.
~ macOS Monterey 12.4, Apple M1

C Compiler and version.
~ Apple clang version 13.1.6 (clang-1316.0.21.2.5)
~ InstalledDir: /Library/Developer/CommandLineTools/usr/bin

  • The output of any cmake , make , or other commands executed during the build.

Compiling gives …

193 warnings generated.
ld: library not found for -l/opt/homebrew/Cellar/mongo-c-driver/1.22.0/lib/cmake/mongoc-1.0

hello.c …

#include <mongoc/mongoc.h>

int main() {
   const char *uri_string = "mongodb://localhost:27017";
   mongoc_uri_t *uri;
   mongoc_client_t *client;
   mongoc_database_t *database;
   mongoc_collection_t *collection;
   bson_t *command, reply, *insert;
   bson_error_t error;
   char *str;
   bool retval;

   /*
    * Required to initialize libmongoc's internals
    */
   mongoc_init ();


  printf( "Hello, world!\n" );

}

Content of library directory …

ls -lh /opt/homebrew/Cellar/mongo-c-driver/1.22.0/lib/cmake/mongoc-1.0
total 40
-r–r–r-- 1 james admin 1.9K 29 Jun 17:41 mongoc-1.0-config-version.cmake
-r–r–r-- 1 james admin 125B 29 Jun 17:41 mongoc-1.0-config.cmake
-r–r–r-- 1 james admin 1.4K 29 Jun 17:41 mongoc-targets-release.cmake
-r–r–r-- 1 james admin 4.8K 29 Jun 17:41 mongoc-targets.cmake

I was expecting some files with today’s date within the directory.

Any ideas? I will be happy to supply further info on request. Thanks in advance for your time.

2

it is either you haven’t fully built the driver or you are using the wrong library folder.
have you followed the installation steps and checked the tutorial on libmongoc — libmongoc 1.22.0 ?

1 Like
3

Thank you I was not aware of the document. I will study it and see if it will lead to a solution to my problem.

4

Thanks for you help. Problem was that I was specifying the header and include paths manually. As such the library was not being found. Using CMake worked, but produced extra files and directories. Initially, pkg-config compiled but gave hundreds of Warnings from /usr/local/include/stdlib.h

I removed Python, Xcode and Command Line Tools. Downloaded the DMG for Command Line Tools and installed. The directory /usr/local is now empty and my theory is that is where the problem arose.

5

I don’t know how to clean up a Mac, but try reinstalling C development environment. it seems scrambled a lot.

“CMake” is not actual builder, but a maker for files of other build systems such as “make”. You can still invoke a build command with it, but you need to pay attention to its flags and parameters.

then take a close look where it puts those builds. you will need in your mongodb compilation path.

I don’t own a Mac that I can help only so far.

6

You have been very helpful already !! Thank you so much :yum:

7

The above helped the solution to my problem

1 Like