Issue with vsprintf(), no float printed or conflict

[rei-vilo]

Results for the basic example sketch calling vsprintf() are:

=== Test of vsprintf on LPSTK
numberF =
number32 = 123456

The float isn't printed.
Adding -Dprintf=iprintf has no impact.
Adding -Dprintf=fprintf results in a conflict with

In file included from /Users/ReiVilo/Library/Energia15/packages/energia/tools/arm-none-eabi-gcc/6.3.1-20170620/arm-none-eabi/include/string.h:10:0,
                 from /Users/ReiVilo/Library/Energia15/packages/energia/hardware/cc13x2/5.29.0-beta2/cores/cc13x2/ti/runtime/wiring/Energia.h:38,
                 from main.cpp:30:
/<command-line>:1:8: conflicting declaration of C function 'int fprintf(const char*, ...)'
/Users/ReiVilo/Library/Energia15/packages/energia/tools/arm-none-eabi-gcc/6.3.1-20170620/arm-none-eabi/include/stdio.h:196:5: previous declaration 'int fprintf(FILE*, const char*, ...)'
 int _EXFUN(fprintf, (FILE *__restrict, const char *__restrict, ...)
     ^

• Code of the basic example sketch

#include "Energia.h"

// Functions
#include "stdarg.h"
#include "stdio.h"
char bufferOut[128];

String formatString(const char * format, ...)
{
    va_list args;
    va_start(args, format);
    vsprintf(bufferOut, format, args);
    va_end(args);
    return String(bufferOut);
}

// Add setup code
// !!! Help: http://bit.ly/2BmKRzI
void setup()
{
    Serial.begin(115200);
    Serial.println("=== Test of vsprintf on LPSTK");
    uint32_t number32 = 123456;
    float numberF = 1234.56;
    
    Serial.println(formatString("%-10s= %8.2f", "numberF", numberF));
    Serial.println(formatString("%-10s= %8i", "number32", number32));

    
}

// Add loop code
void loop()
{

}

[rei-vilo]

Tested with both arm-none-eabi-gcc (GNU Tools for ARM Embedded Processors 6-2017-q2-update) 6.3.1 20170620 (release) [ARM/embedded-6-branch revision 249437]and arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 8-2019-q3-update) 8.3.1 20190703 (release) [gcc-8-branch revision 273027], to no avail.

[rei-vilo]

Same issue, same solution.

See energia/msp432r-core#17 and -Wl,-u,_printf_float,-u,-_scanf_float

[rei-vilo]

See #11