Trouble with GNU GMP rebuilt with cygwin

Not only that debugging is out of the question for me now, but the gmp library decided to stop working too.

Because I changed the compiler (see link above), I lost the pre-built gmp library. I successfully configured, rebuild and installed the gmp from the sources (no errors, no warnings, gmp.a and gmp.h generated), adjusted the paths in my code and... abort. Literally.

I use the following kind of lines for "debugging":

printf("\n\n%d\n", __LINE__);

to understand what is being executed.

And the program just aborts at the call of mpz_init2() (line 2362 in the code) in the init() function at the beginning:

printf("\n\n%d\n", __LINE__);
//mp_set_memory_functions ( customGmpMalloc, customGmpRealloc, customGmpFree );

printf("\n\n%d\n", __LINE__);
snprintf ( strForLOG, STR4LOG_LEN, "%s (line %4d): Initializing the MPZ_T numbers (allocating memory) of the bufPSEUDO structure... ", getTimeStamp(0), __LINE__ ); OUT2LOG();

printf("\n\n%d\n", __LINE__);
mpz_init2 ( bufPSEUDO.firstValueInBuf_MPZ        , DIGITS2BITS ( mConfigDigits[ BUF_CNT_BIG - 1 ].cntDigits ) / 2 + 1     ); /* GNU MP */

printf("\n\n%d\n", __LINE__);
mpz_init2 ( crtPseudo_MPZ                        , DIGITS2BITS ( mConfigDigits[ BUF_CNT_BIG - 1 ].cntDigits ) / 2 + 1 + 64); /* GNU MP */

printf("\n\n%d\n", __LINE__);

NOTE: The previous line, as well as the rest of the software were running OK with the pre-built library provided by one of the MinGW installations I have.

It fails equally whether I call or not the mp_set_memory_functions ().

The 3 functions cannot be much simpler. The printf()s there are poor man's debugging, remember? And while(1) is just a pause in the software, so I have a chance to see the output while debugging.

void* customGmpMalloc ( size_t size )
{
    void *ret;

    printf("\n\nmalloc() 1 %d\n\n", __LINE__ );
    ret = malloc (size);
    printf("\n\nmalloc() 2 %d\n\n", __LINE__ );

    if (ret == 0)
    {
        fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)\n", (long) size);
        while ( 1 );
        abort ();
    }

    return ret;
}

void* customGmpRealloc ( void *oldptr, size_t old_size, size_t new_size )
{
    void *ret;

    printf("\n\nrealloc() 1 %d\n\n", __LINE__ );
    ret = realloc (oldptr, new_size);
    printf("\n\nrealloc() 2 %d\n\n", __LINE__ );

    if (ret == 0)
    {
        fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)\n", (long) old_size, (long) new_size);
        while ( 1 );
        abort ();
    }

    return ret;
}

void customGmpFree ( void *blk_ptr, size_t blk_size )
{
    printf("\n\nfree()\n\n");

    free (blk_ptr);
}

None of the printf()s in the custom allocation functions gets executed, so my assumption is that there is a problem with the access to the library itself, rather than being a problem of allocation. To make things even more confusing, mp_set_memory_functions () gets executed.

Codeblocks only returns me:

Process returned 2048 (0x800) execution time : 0.384 s

And I did not find that error on the net.

The actual output is this:

2025-07-23 07:16:18 (line 2317): Preparing log file... OK
2025-07-23 07:16:18 (line 2334): NOTE: Timestamps in GMT (UTC) time, returned by gmtime()...
2025-07-23 07:16:18 (line 2335): GMP version = 6.3.0


2357


2359
2025-07-23 07:16:18 (line 2360): Initializing the MPZ_T numbers (allocating memory) of the bufPSEUDO structure...

2361

Process returned 2048 (0x800)   execution time : 0.384 s
Press any key to continue.

EDIT:

I just made a minimal example, and it works as expected :(

#include <stdio.h>
#include <stdlib.h>
#include <gmp.h>

mpz_t a;

void* customGmpMalloc  ( size_t size );
void* customGmpRealloc ( void *oldptr, size_t old_size, size_t new_size );
void  customGmpFree    ( void *blk_ptr, size_t blk_size );


void* customGmpMalloc ( size_t size )
{
    void *ret;

    printf("\n\nmalloc() 1 %d\n\n", __LINE__ );
    ret = malloc (size);
    printf("\n\nmalloc() 2 %d\n\n", __LINE__ );

    if (ret == 0)
    {
        fprintf (stderr, "GNU MP: Cannot allocate memory (size=%lu)\n", (long) size);
        while ( 1 );
        abort ();
    }

    return ret;
}

void* customGmpRealloc ( void *oldptr, size_t old_size, size_t new_size )
{
    void *ret;

    printf("\n\nrealloc() 1 %d\n\n", __LINE__ );
    ret = realloc (oldptr, new_size);
    printf("\n\nrealloc() 2 %d\n\n", __LINE__ );

    if (ret == 0)
    {
        fprintf (stderr, "GNU MP: Cannot reallocate memory (old_size=%lu new_size=%lu)\n", (long) old_size, (long) new_size);
        while ( 1 );
        abort ();
    }

    return ret;
}

void customGmpFree ( void *blk_ptr, size_t blk_size )
{
    printf("\n\nfree()\n\n");

    free (blk_ptr);
}


int main()
{
    printf("\n\n%d\n", __LINE__);

    //mp_set_memory_functions ( customGmpMalloc, customGmpRealloc, customGmpFree );

    printf("\n\n%d\n", __LINE__);

    mpz_init2 ( a, 3321928093 ); /* GNU MP */

    printf("\n\n%d\n", __LINE__);

    return(0);
}