Add atanh, copysign, cbrt, remainder, remquo to math.cpp.

The supported C99 math functions provided by math.cpp are thus

   hypot
   log1p
   asinh
   atanh
   copysign
   cbrt
   remainder
   remquo
   round
   lround

Make compiler checks in CMakeLists.txt and configure.ac consistent with
this set.

Make geodesic.c use the math.cpp defined (instead of the internally
defined) versions of

   hypot
   atanh
   copysign
   cbrt

This is keyed off the presence of the PROJ_LIB macro.  I had at one
time

    https://github.com/OSGeo/PROJ/pull/1425

suggested supplying an additional macro PROJ_COMPILATION when compiling
geodesic.c.  However, PROJ_LIB seems to fill the bill OK.

The *next* version of geodesic.c (due out in a few weeks) will also use

   remainder
   remquo

All of this is only of concern for C compilers without C99 support.  So
this may become an historical footnote at some point.

1 files changed, 5 insertions, 5 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index d44d20ce..55722f91 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -139,11 +139,11 @@ check_c_source_compiles("
 #include <math.h>
 int main() {
   int q;
-  return (int)(
-    hypot(3.0, 4.0) + atanh(0.8) + cbrt(8.0) +
-    remquo(100.0, 90.0, &q) +
-    remainder(100.0, 90.0) + copysign(1.0, -0.0) +
-    log1p(0.1) + asinh(0.1)) + isnan(0.0);
+  return (int)(hypot(3.0, 4.0) + log1p(2.0) + asinh(10.0) +
+               atanh(0.8) + cbrt(8.0) + remquo(100.0, 90.0, &q) +
+               remainder(100.0, 90.0) + copysign(1.0, -0.0) +
+               round(3.5)) +
+         (int)(lround(-3.5)) + isnan(0.0);
 }
 " C99_MATH)
 if(C99_MATH)