Clean out stdlib_support.

We don't need two of these, and the other deserves a static_assert.

Test: ./run_tests.py
Bug: android/ndk#300
Change-Id: I76939d3bfb1a19e16fef737a0425bc173259cdd6

sources/android/support/Android.mk

@@ -48,6 +48,7 @@ android_support_sources := \
     src/_Exit.cpp \
     src/iswblank.cpp \
     src/posix_memalign.cpp \
+    src/stdlib_support.cpp \
     src/swprintf.cpp \
 
 # These are old sources that should be purged/rewritten/taken from bionic.
@@ -64,7 +65,6 @@ android_support_sources += \
     src/musl-math/frexp.c \
     src/musl-math/frexpf.c \
     src/musl-math/frexpl.c \
-    src/stdlib_support.c \
     src/wchar_support.c \
     src/wcstox/floatscan.c \
     src/wcstox/intscan.c \

sources/android/support/src/stdlib_support.c → sources/android/support/src/stdlib_support.cpp

@@ -26,33 +26,9 @@
  * SUCH DAMAGE.
  */
 
-// Contains an implementation of all stdlib functions missing from bionic.
-//
-// TODO(digit): Make these work.
-
-#include <inttypes.h>
 #include <stdlib.h>
-#include <assert.h>
 
 long double strtold(const char* nptr, char** endptr) {
-  //FIXME: Although in Android long double is the same as double, can we borrow stdtod?
+  static_assert(sizeof(double) == sizeof(long double), "double != long double");
   return strtod(nptr, endptr);
 }
-
-intmax_t imaxabs(intmax_t j)
-{
-  return (j < 0 ? -j : j);
-}
-
-imaxdiv_t imaxdiv(intmax_t numer, intmax_t denom)
-{
-  imaxdiv_t retval;
-
-  retval.quot = numer / denom;
-  retval.rem = numer % denom;
-  if (numer >= 0 && retval.rem < 0) {
-    retval.quot++;
-    retval.rem -= denom;
-  }
-  return (retval);
-}