[Bug libstdc++/114101] FAIL: 26_numerics/headers/cmath/functions_std_c++17.cc -std=gnu++17 (test for excess errors)

["dave.anglin at bell dot net" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114101

--- Comment #2 from dave.anglin at bell dot net ---
On 2024-02-25 2:17 p.m., redi at gcc dot gnu.org wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114101
>
> Jonathan Wakely <redi at gcc dot gnu.org> changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>             See Also|                            |https://gcc.gnu.org/bugzill
>                     |                            |a/show_bug.cgi?id=79700
The patch I posted allows HP-UX targets to make use of the above change.  I
defined
_GLIBCXX_USE_C99_MATH_FUNCS and _GLIBCXX_USE_BUILTIN_FMAF in
config/os/hpux/os_defines.h:

+// Import C99 functions in <math.h> in <cmath> in namespace std in C++11.
+// Missing functions are handled by stubs.  The fma, nexttoward, scalbln
+// and tgamma are missing in HP-UX 11.  Many float variants are supported.
+#define _GLIBCXX_USE_C99_MATH_FUNCS 1
+#define _GLIBCXX_USE_C99_MATH_TR1 1

Had to add double stubs for fma, nexttoward, scalbln and tgamma to complete the
set
of required functions.

Currently, _GLIBCXX_USE_C99_MATH_FUNCS and _GLIBCXX_USE_C99_MATH_TR1 are
only enabled when configure detects the full set of C99 functions.