[PATCH] libstdc++: testsuite: require cmath for nexttowardl

[Alexandre Oliva]

nexttowardl is only expected to be available with C99 math, but
20_util/to_chars/long_double.cc uses it unconditionally.

State the cmath requirement in the test.

Regstrapped on x86_64-linux-gnu, also tested with a cross to
aarch64-rtems6.  Ok to install?


for  libstdc++-v3/ChangeLog

	* testsuite/20_util/to_chars/long_double.cc: Require cmath.
---
 .../testsuite/20_util/to_chars/long_double.cc      |    1 +
 1 file changed, 1 insertion(+)

diff --git a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
index 94b5b5967d374..0b1c2c2936fdc 100644
--- a/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
+++ b/libstdc++-v3/testsuite/20_util/to_chars/long_double.cc
@@ -36,6 +36,7 @@
 
 // { dg-require-effective-target ieee_floats }
 // { dg-require-effective-target size32plus }
+// { dg-require-cmath "" }
 
 #include <charconv>
 


-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
Disinformation flourishes because many people care deeply about injustice
but very few check the facts.  Ask me about <https://stallmansupport.org>