diff options
Diffstat (limited to 'include/libc-symbols.h')
| -rw-r--r-- | include/libc-symbols.h | 68 |
1 files changed, 49 insertions, 19 deletions
diff --git a/include/libc-symbols.h b/include/libc-symbols.h index 18f26b2e61..3310e3a678 100644 --- a/include/libc-symbols.h +++ b/include/libc-symbols.h @@ -20,26 +20,46 @@ #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, @@ -50,8 +70,17 @@ 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> @@ -936,4 +965,5 @@ for linking") # define _GL_ATTRIBUTE_CONST /* empty */ #endif +#endif /* !_ISOMAC */ #endif /* libc-symbols.h */ |