PR fortran/18218

	* configure.ac: Check for strtof.
	* configure: Regenerate.
	* config.h.in: Regenerate.
	* io/read.c (convert_real): Use strtof if available.
	(convert_precision_real): Remove.
	(read_f): Avoid poor exponentiation algorithm.
gcc/testsuite/
	* gfortran.dg/list_read.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@90382 138bc75d-0d04-0410-961f-82ee72b054a4