math: Remove __XXX math functions from installed math.h [BZ #32418]

Since libm doesn't export __XXX math functions, don't declare them in
the installed math.h by adding <bits/mathcalls-macros.h> to declare
__XXX math functions internally for glibc build.  This fixes BZ #32418.

Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Reviewed-by: Sam James <sam@gentoo.org>

include/bits/mathcalls-macros.h

@@ -0,0 +1,12 @@
+#include <math/bits/mathcalls-macros.h>
+
+/* The file <bits/mathcalls.h> contains the prototypes for all the
+   actual math functions.  These macros are used for those prototypes,
+   so we can easily declare each function as both `name' and `__name',
+   and can declare the float versions `namef' and `__namef' for internal
+   use.  */
+
+#undef __MATHDECLX
+#define __MATHDECLX(type, function,suffix, args, attrib) \
+  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
+  __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)

include/math.h

@@ -10,6 +10,11 @@
 /* Now define the internal interfaces.  */
 extern int __signgam;
 
+# undef __MATHDECLX
+# define __MATHDECLX(type, function,suffix, args, attrib) \
+  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
+  __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)
+
 # if IS_IN (libc) || IS_IN (libm)
 hidden_proto (__finite)
 hidden_proto (__isinf)

math/Makefile

@@ -35,6 +35,7 @@ headers := \
   bits/long-double.h \
   bits/math-vector.h \
   bits/mathcalls-helper-functions.h \
+  bits/mathcalls-macros.h \
   bits/mathcalls-narrow.h \
   bits/mathcalls.h \
   bits/mathdef.h \

math/bits/mathcalls-macros.h

@@ -0,0 +1,48 @@
+/* Macros for math function declarations.
+   Copyright (C) 2024 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
+   <https://www.gnu.org/licenses/>.  */
+
+#define __SIMD_DECL(function) __CONCAT (__DECL_SIMD_, function)
+
+#define __MATHCALL_VEC(function, suffix, args) 	\
+  __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
+  __MATHCALL (function, suffix, args)
+
+#define __MATHDECL_VEC(type, function,suffix, args) \
+  __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
+  __MATHDECL(type, function,suffix, args)
+
+#define __MATHCALL(function,suffix, args)	\
+  __MATHDECL (_Mdouble_,function,suffix, args)
+#define __MATHDECL(type, function,suffix, args) \
+  __MATHDECL_1(type, function,suffix, args); \
+  __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
+#define __MATHCALLX(function,suffix, args, attrib)	\
+  __MATHDECLX (_Mdouble_,function,suffix, args, attrib)
+#define __MATHDECLX(type, function,suffix, args, attrib) \
+  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib);
+#define __MATHDECL_1_IMPL(type, function, suffix, args) \
+  extern type __MATH_PRECNAME(function,suffix) args __THROW
+#define __MATHDECL_1(type, function, suffix, args) \
+  __MATHDECL_1_IMPL(type, function, suffix, args)
+/* Ignore the alias by default.  The alias is only useful with
+   redirections.  */
+#define __MATHDECL_ALIAS(type, function, suffix, args, alias) \
+  __MATHDECL_1(type, function, suffix, args)
+
+#define __MATHREDIR(type, function, suffix, args, to) \
+  extern type __REDIRECT_NTH (__MATH_PRECNAME (function, suffix), args, to)

math/math.h

@@ -268,42 +268,7 @@ enum
   };
 #endif
 
-/* The file <bits/mathcalls.h> contains the prototypes for all the
+#include <bits/mathcalls-macros.h>
-   actual math functions.  These macros are used for those prototypes,
-   so we can easily declare each function as both `name' and `__name',
-   and can declare the float versions `namef' and `__namef'.  */
-
-#define __SIMD_DECL(function) __CONCAT (__DECL_SIMD_, function)
-
-#define __MATHCALL_VEC(function, suffix, args) 	\
-  __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
-  __MATHCALL (function, suffix, args)
-
-#define __MATHDECL_VEC(type, function,suffix, args) \
-  __SIMD_DECL (__MATH_PRECNAME (function, suffix)) \
-  __MATHDECL(type, function,suffix, args)
-
-#define __MATHCALL(function,suffix, args)	\
-  __MATHDECL (_Mdouble_,function,suffix, args)
-#define __MATHDECL(type, function,suffix, args) \
-  __MATHDECL_1(type, function,suffix, args); \
-  __MATHDECL_1(type, __CONCAT(__,function),suffix, args)
-#define __MATHCALLX(function,suffix, args, attrib)	\
-  __MATHDECLX (_Mdouble_,function,suffix, args, attrib)
-#define __MATHDECLX(type, function,suffix, args, attrib) \
-  __MATHDECL_1(type, function,suffix, args) __attribute__ (attrib); \
-  __MATHDECL_1(type, __CONCAT(__,function),suffix, args) __attribute__ (attrib)
-#define __MATHDECL_1_IMPL(type, function, suffix, args) \
-  extern type __MATH_PRECNAME(function,suffix) args __THROW
-#define __MATHDECL_1(type, function, suffix, args) \
-  __MATHDECL_1_IMPL(type, function, suffix, args)
-/* Ignore the alias by default.  The alias is only useful with
-   redirections.  */
-#define __MATHDECL_ALIAS(type, function, suffix, args, alias) \
-  __MATHDECL_1(type, function, suffix, args)
-
-#define __MATHREDIR(type, function, suffix, args, to) \
-  extern type __REDIRECT_NTH (__MATH_PRECNAME (function, suffix), args, to)
 
 #define _Mdouble_		double
 #define __MATH_PRECNAME(name,r)	__CONCAT(name,r)