/* Support macros for making weak and strong aliases for symbols,
and for using symbol sets and linker warnings with GNU ld.
- Copyright (C) 1995-2016 Free Software Foundation, Inc.
+ Copyright (C) 1995-2017 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
#ifndef _LIBC_SYMBOLS_H
#define _LIBC_SYMBOLS_H 1
-#define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
-#define IS_IN(lib) (IN_MODULE == MODULE_##lib)
+/* This file is included implicitly in the compilation of every source file,
+ using -include. It includes config.h. */
-/* Returns true if the current module is a versioned library. Versioned
- library names culled from shlib-versions files are assigned a MODULE_*
- value lower than MODULE_LIBS_BEGIN. */
-#define IS_IN_LIB (IN_MODULE > MODULE_LIBS_BEGIN)
-
-#define PASTE_NAME(a,b) PASTE_NAME1 (a,b)
-#define PASTE_NAME1(a,b) a##b
-
-/* This file's macros are included implicitly in the compilation of every
- file in the C library by -imacros.
-
- We include config.h which is generated by configure.
- It should define for us the following symbol:
+/* Enable declarations of GNU extensions, since we are compiling them. */
+#define _GNU_SOURCE 1
+
+#ifdef MODULE_NAME
+
+/* Use `#if IS_IN (module)` to detect what component is being compiled. */
+#define PASTE_NAME1(a,b) a##b
+#define PASTE_NAME(a,b) PASTE_NAME1 (a,b)
+#define IN_MODULE PASTE_NAME (MODULE_, MODULE_NAME)
+#define IS_IN(lib) (IN_MODULE == MODULE_##lib)
+
+/* True if the current module is a versioned library. Versioned
+ library names culled from shlib-versions files are assigned a
+ MODULE_* value greater than MODULE_LIBS_BEGIN. */
+#define IS_IN_LIB (IN_MODULE > MODULE_LIBS_BEGIN)
+
+/* The testsuite, and some other ancillary code, should be compiled against
+ as close an approximation to the installed headers as possible.
+ Defining this symbol disables most internal-use-only declarations
+ provided by this header, and all those provided by other internal
+ wrapper headers. */
+#if IS_IN (testsuite) || defined IS_IN_build || defined __cplusplus
+# define _ISOMAC 1
+#endif
- * HAVE_ASM_SET_DIRECTIVE if we have `.set B, A' instead of `A = B'.
+#else
+/* The generation process for a few files created very early in the
+ build (notably libc-modules.h itself) involves preprocessing this
+ header without defining MODULE_NAME. Under these conditions,
+ internal declarations (especially from config.h) must be visible,
+ but IS_IN should always evaluate as false. */
+# define IS_IN(lib) 0
+# define IS_IN_LIB 0
+# define IN_MODULE (-1)
+#endif
- */
+#ifndef _ISOMAC
/* This is defined for the compilation of all C library code. features.h
tests this to avoid inclusion of stubs.h while compiling the library,
itself is being compiled, or just some generator program. */
#define _LIBC 1
-/* Enable declarations of GNU extensions, since we are compiling them. */
-#define _GNU_SOURCE 1
+/* Some files must be compiled with optimization on. */
+#if !defined __ASSEMBLER__ && !defined __OPTIMIZE__
+# error "glibc cannot be compiled without optimization"
+#endif
+
+/* -ffast-math cannot be applied to the C library, as it alters the ABI.
+ Some test components that use -ffast-math are currently not part of
+ IS_IN (testsuite) for technical reasons, so we have a secondary override. */
+#if defined __FAST_MATH__ && !defined TEST_FAST_MATH
+# error "glibc must not be compiled with -ffast-math"
+#endif
#include <config.h>
# define libnsl_hidden_proto(name, attrs...) hidden_proto (name, ##attrs)
# define libnsl_hidden_tls_proto(name, attrs...) \
hidden_tls_proto (name, ##attrs)
+# ifdef LINK_OBSOLETE_NSL
+ /* libnsl_hidden_nolink should only get used in libnsl code. */
+# define libnsl_hidden_nolink_def(name, version) libnsl_hidden_def (name)
+# else
+# define libnsl_hidden_nolink_def(name, version) hidden_nolink (name, libnsl, version)
+# endif
# define libnsl_hidden_def(name) hidden_def (name)
# define libnsl_hidden_weak(name) hidden_weak (name)
# define libnsl_hidden_ver(local, name) hidden_ver (local, name)
#else
# define inhibit_loop_to_libcall
#endif
+\f
+/* These macros facilitate sharing source files with gnulib.
+
+ They are here instead of sys/cdefs.h because they should not be
+ used in public header files.
+
+ Their definitions should be kept consistent with the definitions in
+ gnulib-common.m4, but it is not necessary to cater to old non-GCC
+ compilers, since they will only be used while building glibc itself.
+ (Note that _GNUC_PREREQ cannot be used in this file.) */
+
+/* Define as a marker that can be attached to declarations that might not
+ be used. This helps to reduce warnings, such as from
+ GCC -Wunused-parameter. */
+#if __GNUC__ >= 3 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 7)
+# define _GL_UNUSED __attribute__ ((__unused__))
+#else
+# define _GL_UNUSED
+#endif
+
+/* gcc supports the "unused" attribute on possibly unused labels, and
+ g++ has since version 4.5. Note to support C++ as well as C,
+ _GL_UNUSED_LABEL should be used with a trailing ; */
+#if !defined __cplusplus || __GNUC__ > 4 \
+ || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
+# define _GL_UNUSED_LABEL _GL_UNUSED
+#else
+# define _GL_UNUSED_LABEL
+#endif
+
+/* The __pure__ attribute was added in gcc 2.96. */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 96)
+# define _GL_ATTRIBUTE_PURE __attribute__ ((__pure__))
+#else
+# define _GL_ATTRIBUTE_PURE /* empty */
+#endif
+
+/* The __const__ attribute was added in gcc 2.95. */
+#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 95)
+# define _GL_ATTRIBUTE_CONST __attribute__ ((__const__))
+#else
+# define _GL_ATTRIBUTE_CONST /* empty */
+#endif
+#endif /* !_ISOMAC */
#endif /* libc-symbols.h */
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