Update floating point compilation options

cmake/FastMath.cmake

@@ -6,6 +6,6 @@ function(EnableFastMath flag)
   if(MSVC)
     add_compile_options("/fp:fast")
   else()
-    add_compile_options("-ffast-math")
+    add_compile_options("-ffast-math -fno-finite-math-only")
   endif()
 endfunction()

src/celcompat/CMakeLists.txt

@@ -1,10 +1,13 @@
-if (NOT HAVE_FLOAT_CHARCONV)
+if(NOT HAVE_FLOAT_CHARCONV)
 set(CELCOMPAT_SOURCES
   charconv_impl.cpp
   charconv_impl.h
 )
 endif()
 
-if (CELCOMPAT_SOURCES)
+if(CELCOMPAT_SOURCES)
   add_library(celcompat OBJECT ${CELCOMPAT_SOURCES})
+  if(NOT MSVC)
+    target_compile_options(celcompat PRIVATE -fmath-errno)
+  endif()
 endif()