"cannot convert to a pointer type" compilation error

[R. Diez via newlib]

Hallo all:

I am trying to upgrade my toolchain for an embedded ARM Cortex-M4F 
processor to newlib 3.0.0 with GCC 7.3, and I am getting the following 
compilation errors:


/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfscanf.c: 
In function '__ssvfscanf_r':
/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfscanf.c:430:2: 
error: cannot convert to a pointer type
   ret = _scanf_chars (rptr, &scan_data, fp, va_ptr(ap));
   ^~~

/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfscanf.c:432:2: 
error: cannot convert to a pointer type
   ret = _scanf_i (rptr, &scan_data, fp, va_ptr(ap));
   ^~~

/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfprintf.c: 
In function '_svfprintf_r':
/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfprintf.c:644:2: 
error: cannot convert to a pointer type
   n = _printf_i (data, &prt_data, fp, pfunc, va_ptr(ap));
   ^
make[7]: *** [Makefile:1935: lib_a-nano-svfscanf.o] Error 1
make[7]: *** Waiting for unfinished jobs....

/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfprintf.c: 
In function '_vfprintf_r':
/home/rdiez/GsShared/Toolchains/ToolchainSet-2018-01-29-5/Toolchain-cortex-m4f-build/newlib-3.0.0/newlib/libc/stdio/nano-vfprintf.c:644:2: 
error: cannot convert to a pointer type
   n = _printf_i (data, &prt_data, fp, pfunc, va_ptr(ap));
   ^


I suspect it has to do with va_ptr().

With Newlib 2.5.0.20170922 and GCC 6.4.0 I had no problems.

Can anybody help?

Best regards,
   Ruben