[PATCH] libstdc++: Add missing functions to <cmath> [PR79700]

[Nathaniel Shead <nathanieloshead@gmail.com>]

The comments on PR79700 mentioned that it was somewhat ambiguous whether
these functions were supposed to exist for C++11 or not. I chose to add
them there, since other resources (such as cppreference) seem to think
that C++11 should be the standard these functions were introduced, and I
don't know of any reason to do otherwise.

Tested on x86_64-linux.

-- 8< --

This patch adds the -f and -l variants of the C89 <math.h> functions to
<cmath> under namespace std (so std::sqrtf, std::fabsl, etc.) for C++11
and up.

libstdc++-v3/ChangeLog:

	PR libstdc++/79700
	* include/c_global/cmath (acosf, acosl, asinf, asinl, atanf,
        atanl, atan2f, atan2l, ceilf, ceill, cosf, cosl, coshf, coshl,
        expf, expl, fabsf, fabsl, floorf, floorl, fmodf, fmodl, frexpf,
        frexpl, ldexpf, ldexpl, logf, logl, log10f, log10l, modff,
        modfl, powf, powl, sinf, sinl, sinhf, sinhl, sqrtf, sqrtl, tanf,
        tanl, tanhf, tanhl): Add aliases in namespace std.
	* testsuite/26_numerics/headers/cmath/functions_std_c++17.cc:
        Add checks for existence of above names.

Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
---
 libstdc++-v3/include/c_global/cmath           | 111 ++++++++++++++++++
 .../headers/cmath/functions_std_c++17.cc      |  45 +++++++
 2 files changed, 156 insertions(+)

diff --git a/libstdc++-v3/include/c_global/cmath b/libstdc++-v3/include/c_global/cmath
index 568eb354c2d..eaebde33dee 100644
--- a/libstdc++-v3/include/c_global/cmath
+++ b/libstdc++-v3/include/c_global/cmath
@@ -1767,6 +1767,117 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
 #if __cplusplus >= 201103L
 
+#undef acosf
+#undef acosl
+#undef asinf
+#undef asinl
+#undef atanf
+#undef atanl
+#undef atan2f
+#undef atan2l
+#undef ceilf
+#undef ceill
+#undef cosf
+#undef cosl
+#undef coshf
+#undef coshl
+#undef expf
+#undef expl
+#undef fabsf
+#undef fabsl
+#undef floorf
+#undef floorl
+#undef fmodf
+#undef fmodl
+#undef frexpf
+#undef frexpl
+#undef ldexpf
+#undef ldexpl
+#undef logf
+#undef logl
+#undef log10f
+#undef log10l
+#undef modff
+#undef modfl
+#undef powf
+#undef powl
+#undef sinf
+#undef sinl
+#undef sinhf
+#undef sinhl
+#undef sqrtf
+#undef sqrtl
+#undef tanf
+#undef tanl
+#undef tanhf
+#undef tanhl
+
+  using ::acosf;
+  using ::acosl;
+
+  using ::asinf;
+  using ::asinl;
+
+  using ::atanf;
+  using ::atanl;
+
+  using ::atan2f;
+  using ::atan2l;
+
+  using ::ceilf;
+  using ::ceill;
+
+  using ::cosf;
+  using ::cosl;
+
+  using ::coshf;
+  using ::coshl;
+
+  using ::expf;
+  using ::expl;
+
+  using ::fabsf;
+  using ::fabsl;
+
+  using ::floorf;
+  using ::floorl;
+
+  using ::fmodf;
+  using ::fmodl;
+
+  using ::frexpf;
+  using ::frexpl;
+
+  using ::ldexpf;
+  using ::ldexpl;
+
+  using ::logf;
+  using ::logl;
+
+  using ::log10f;
+  using ::log10l;
+
+  using ::modff;
+  using ::modfl;
+
+  using ::powf;
+  using ::powl;
+
+  using ::sinf;
+  using ::sinl;
+
+  using ::sinhf;
+  using ::sinhl;
+
+  using ::sqrtf;
+  using ::sqrtl;
+
+  using ::tanf;
+  using ::tanl;
+
+  using ::tanhf;
+  using ::tanhl;
+
 #ifdef _GLIBCXX_USE_C99_MATH_TR1
 
 #undef acosh
diff --git a/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++17.cc b/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++17.cc
index 3b4ada1a756..c6ec636c183 100644
--- a/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++17.cc
+++ b/libstdc++-v3/testsuite/26_numerics/headers/cmath/functions_std_c++17.cc
@@ -44,6 +44,51 @@ namespace gnu
   using std::tan;
   using std::tanh;
 
+  using std::acosf;
+  using std::acosl;
+  using std::asinf;
+  using std::asinl;
+  using std::atanf;
+  using std::atanl;
+  using std::atan2f;
+  using std::atan2l;
+  using std::ceilf;
+  using std::ceill;
+  using std::cosf;
+  using std::cosl;
+  using std::coshf;
+  using std::coshl;
+  using std::expf;
+  using std::expl;
+  using std::fabsf;
+  using std::fabsl;
+  using std::floorf;
+  using std::floorl;
+  using std::fmodf;
+  using std::fmodl;
+  using std::frexpf;
+  using std::frexpl;
+  using std::ldexpf;
+  using std::ldexpl;
+  using std::logf;
+  using std::logl;
+  using std::log10f;
+  using std::log10l;
+  using std::modff;
+  using std::modfl;
+  using std::powf;
+  using std::powl;
+  using std::sinf;
+  using std::sinl;
+  using std::sinhf;
+  using std::sinhl;
+  using std::sqrtf;
+  using std::sqrtl;
+  using std::tanf;
+  using std::tanl;
+  using std::tanhf;
+  using std::tanhl;
+
   using std::assoc_laguerre;
   using std::assoc_laguerref;
   using std::assoc_laguerrel;
-- 
2.34.1