acconfig.h: Add _GLIBCXX_USE_C99_MATH.
* acconfig.h: Add _GLIBCXX_USE_C99_MATH.
* acinclude.m4 (GLIBCXX_ENABLE_C99): Define GLIBCXX_USE_C99_MATH.
* configure.ac: Define HAVE_S_ISREG and HAVE_S_IFREG when
targeting newlib.
* aclocal.m4: Regenerated.
* config.h.in: Likewise.
* configure: Likewise.
* Makefile.in: Likewise.
* include/Makefile.in: Likewise.
* libmath/Makefile.in: Likewise.
* libsupc++/Makefile.in: Likewise.
* testsuite/Makefile.in: Likewise.
* src/Makefile.in: Likewise.
* po/Makefile.in: Likewise.
* include/c_std/std_cmath.h (_GLIBCXX_USE_C99): Replace with ...
(_GLIBCXX_USE_C99_MATH): ... this.
* testsuite/27_io/basic_filebuf/sgetn/char/1-in.cc: XFAIL for
arm-none-elf.
* testsuite/27_io/basic_filebuf/sgetn/char/1-io.cc: Likewise.
* testsuite/27_io/basic_filebuf/sgetn/char/2-in.cc: Likewise.
* testsuite/27_io/basic_filebuf/sgetn/char/2-io.cc: Likewise.
* testsuite/27_io/basic_istream/readsome/char/6476-2.cc: Likewise.
* testsuite/27_io/objects/char/9.cc: Likewise.
* testsuite/ext/stdio_filebuf/char/10063-2.cc: Likewise.
From-SVN: r75209