diff options
Diffstat (limited to 'bits')
| -rw-r--r-- | bits/libc-header-start.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/bits/libc-header-start.h b/bits/libc-header-start.h new file mode 100644 index 0000000000..c6663074a8 --- /dev/null +++ b/bits/libc-header-start.h @@ -0,0 +1,43 @@ +/* Handle feature test macros at the start of a header. + Copyright (C) 2016 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +/* This header is internal to glibc and should not be included outside + of glibc headers. Headers including it must define + __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION first. This header + cannot have multiple include guards because ISO C feature test + macros depend on the definition of the macro when an affected + header is included, not when the first system header is + included. */ + +#ifndef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION +# error "Never include <bits/libc-header-start.h> directly." +#endif + +#undef __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION + +#include <features.h> + +/* ISO/IEC TR 24731-2:2010 defines the __STDC_WANT_LIB_EXT2__ + macro. */ +#undef __GLIBC_USE_LIB_EXT2 +#if (defined __USE_GNU \ + || (defined __STDC_WANT_LIB_EXT2__ && __STDC_WANT_LIB_EXT2__ > 0)) +# define __GLIBC_USE_LIB_EXT2 1 +#else +# define __GLIBC_USE_LIB_EXT2 0 +#endif |