rx-elf-ld fails with undefined reference to `__errno’

In Renesas e2-Studio with KPIT Toolchain I cannot get rx-elf-gcc to work with errno.h.

Consider tho following code:

#include <errno.h>

int main(void)
{

errno = 0;

while (1) {}

return 0;

}

compiles ok, but gives

‘Invoking: Linker’

‘Building target:’

rx-elf-ld -o “testmini.x” -T”D:\Repository\testmini\HardwareDebug\testmini_HardwareDebug_auto.gsi” @”D:\Repository\testmini\HardwareDebug\LinkerSubCommand.tmp” libtestmini.a -M=testmini.map -L”D:\Repository\testmini\HardwareDebug” –start-group -ltestmini -lgcc –end-group

./src/testmini.o: In function `main’:

D:\Repository\testmini\HardwareDebug/../src/testmini.c:47: undefined reference to `__errno’

make: *** [testmini.x] Error 1

makefile:93: recipe for target ‘testmini.x’ failed

Any help is apprciated.

Marc