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Remove _Mlong_double_ etc. macros.

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math.h has a macro _Mlong_double_ for the type to use when declaring
long double functions, and similar macros for other types.
math/Makefile uses -D_Mlong_double_=double in the case of long double
having the same ABI as double.

This originates with:

Mon Jul  8 13:37:40 1996  Roland McGrath  <roland@delasyd.gnu.ai.mit.edu>

        * math/math.h (_Mfloat_, _Mlong_double_): New macros, defined iff not
        already defined to float, long double.  Use those macros for _Mdouble_
        defns when including mathcalls.h.
        * math/Makefile [$(long-double-fcts) != yes] (CPPFLAGS): Append
        -D_Mlong_double_=double.

However, math.h stopped declaring long double functions in the case of
long double having the same ABI as double (and thus probably stopped
actually needing the Makefile definition of _Mlong_double_) with:

1998-11-05  Ulrich Drepper  <drepper@cygnus.com>

        * math/math.h: Unconditionally include bits/mathdef.h.  Declare
        long double functions only if __NO_LONG_DOUBLE_MATH is not
        defined.
        * sysdeps/generic/bits/mathdef.h: Define only if __USE_ISOC9X.
        Define __NO_LONG_DOUBLE_MATH.
        * sysdeps/m68k/fpu/bits/mathdef.h: Define only if __USE_ISOC9X.
        * sysdeps/i386/fpu/bits/mathdef.h: Likewise.

The declarations were since restored for compiling user code, but
remain absent when _LIBC is defined, which is sufficient to avoid
problems declaring function aliases of incompatible types.  Thus the
indirection through the _Mlong_double_ macro is not needed (probably
since that 1998 patch), and this patch removes _Mlong_double_ and
associated macros for other types, leaving only the macro _Mdouble_
which is actually used as the type for which a given inclusion of
<bits/mathcalls.h> should declared functions.

Tested for x86_64, and tested with build-many-glibcs.py that installed
stripped shared libraries are unchanged by this patch.

	* math/math.h [!_Mfloat_] (_Mfloat_): Do not define.
	[!_Mlong_double_] (_Mlong_double_): Likewise.
	[!_Mfloat16_] (_Mfloat16_): Likewise.
	[!_Mfloat32_] (_Mfloat32_): Likewise.
	[!_Mfloat64_] (_Mfloat64_): Likewise.
	[!_Mfloat128_] (_Mfloat128_): Likewise.
	[!_Mfloat32x_] (_Mfloat32x_): Likewise.
	[!_Mfloat64x_] (_Mfloat64x_): Likewise.
	[!_Mfloat128x_] (_Mfloat128x_): Likewise.
	(_Mdouble_): Define without indirection through those macros.
	* math/complex.h [!_Mfloat_] (_Mfloat_): Do not define.
	[!_Mfloat128_] (_Mfloat128_): Likewise.
	[_Mlong_double_] (_Mlong_double_): Likewise.
	(_Mdouble_): Define without indirection through those macros.
	* math/Makefile [$(long-double-fcts) != yes] (math-CPPFLAGS): Do
	not add -D_Mlong_double_=double.
	* include/math.h [_ISOMAC] (_Mlong_double_): Do not undefine.
	* math/test-signgam-finite-c99.c (_Mlong_double_): Likewise.
This commit is contained in:
Joseph Myers
2017-10-30 20:58:51 +00:00
parent 4ad5106e3b
commit eda162dd8a
6 changed files with 35 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
math/complex.h
View File

@ -83,10 +83,7 @@ __BEGIN_DECLS
#undef __MATH_PRECNAME
/* Now the float versions. */
#ifndef _Mfloat_
# define _Mfloat_ float
#endif
#define _Mdouble_ _Mfloat_
#define _Mdouble_ float
#define __MATH_PRECNAME(name) name##f
#include <bits/cmathcalls.h>
#undef _Mdouble_
@ -94,15 +91,12 @@ __BEGIN_DECLS
#if (__HAVE_DISTINCT_FLOAT128 || (__HAVE_FLOAT128 && !defined _LIBC)) \
&& __GLIBC_USE (IEC_60559_TYPES_EXT)
# ifndef _Mfloat128_
# define _Mfloat128_ _Float128
# endif
/* GCC < 7 requires extra convincing to expose a complex float128 type. */
# ifdef __CFLOAT128
# undef _Mdouble_complex_
# define _Mdouble_complex_ __CFLOAT128
# endif
# define _Mdouble_ _Mfloat128_
# define _Mdouble_ _Float128
# define __MATH_PRECNAME(name) name##f128
# include <bits/cmathcalls.h>
# undef _Mdouble_
@ -120,10 +114,7 @@ __BEGIN_DECLS
extern type __REDIRECT_NTH(__MATH_PRECNAME(function), args, function)
# endif
# ifndef _Mlong_double_
# define _Mlong_double_ long double
# endif
# define _Mdouble_ _Mlong_double_
# define _Mdouble_ long double
# define __MATH_PRECNAME(name) name##l
# include <bits/cmathcalls.h>
#endif