Issue #28256: Cleanup _math.c

Only define fallback implementations when needed. It avoids producing deadcode
when the system provides required math functions.

1 files changed, 12 insertions, 12 deletions

diff --git a/Modules/_math.h b/Modules/_math.h
index cf079ad..398b7e8 100644
--- a/Modules/_math.h
+++ b/Modules/_math.h
@@ -1,41 +1,41 @@
-double _Py_acosh(double x);
-double _Py_asinh(double x);
-double _Py_atanh(double x);
-double _Py_expm1(double x);
-double _Py_log1p(double x);
-
 #ifdef HAVE_ACOSH
-#define m_acosh acosh
+#  define m_acosh acosh
 #else
 /* if the system doesn't have acosh, use the substitute
    function defined in Modules/_math.c. */
-#define m_acosh _Py_acosh
+double _Py_acosh(double x);
+#  define m_acosh _Py_acosh
 #endif
 
 #ifdef HAVE_ASINH
-#define m_asinh asinh
+#  define m_asinh asinh
 #else
 /* if the system doesn't have asinh, use the substitute
    function defined in Modules/_math.c. */
-#define m_asinh _Py_asinh
+double _Py_asinh(double x);
+#  define m_asinh _Py_asinh
 #endif
 
 #ifdef HAVE_ATANH
-#define m_atanh atanh
+#  define m_atanh atanh
 #else
 /* if the system doesn't have atanh, use the substitute
    function defined in Modules/_math.c. */
+double _Py_atanh(double x);
 #define m_atanh _Py_atanh
 #endif
 
 #ifdef HAVE_EXPM1
-#define m_expm1 expm1
+#  define m_expm1 expm1
 #else
 /* if the system doesn't have expm1, use the substitute
    function defined in Modules/_math.c. */
+double _Py_expm1(double x);
 #define m_expm1 _Py_expm1
 #endif
 
+double _Py_log1p(double x);
+
 /* Use the substitute from _math.c on all platforms:
    it includes workarounds for buggy handling of zeros. */
 #define m_log1p _Py_log1p