[Patch, fortran] Use getc/putc instead of fgetc/fputc

[Jakub Jelinek]

On Wed, Apr 25, 2007 at 02:25:37PM +0300, Janne Blomqvist wrote:
> :ADDPATCH fortran:
> 
> the attached patch converts the gfortran frontend to use getc/putc 
> instead of fgetc/fputc.
> 
> In normal cases there's no difference, but in pathological cases like 
> e.g. the example program from PR21130 this patch shaves about 5-10s of 
> the 90s runtime.
> 
> I also tried to use the _unlocked stdio functions, but there was no 
> difference. It seems the build system is clever enough to substitute the 
> _unlocked versions automatically when building a single-threaded program.

Look at gcc/system.h, which if configure detects e.g. getc_unlocked
it redefines getc for use in gcc as getc_unlocked etc.
The difference is most probably just in getc_unlocked being implemented
inline, whereas fgetc_unlocked is not.

	Jakub