nan-boxing: use GCC pragmas to disable aliasing warnings.

* arith.c (flo): The line of code which triggers the
aliasing diagnostic is wrapped with GNU-C-specific
pramgas that disable the diagnostic just for that line.

* lib.h (c_f): Likewise.

* configure: Drop the test which adds -Wno-strict-aliasing
to the DIAG_FLAGS;

1 files changed, 0 insertions, 18 deletions

diff --git a/configure b/configure
index 01ac4531..51c11fa8 100755
--- a/configure
+++ b/configure
@@ -1603,24 +1603,6 @@ if [ -n "$nan_boxing" ] ; then
   fi
 fi
 
-if [ -n "$nan_boxing" ] ; then
-  printf "Checking how to disable strict aliasing warnings ... "
-
-  cat > conftest.c <<!
-int main(void)
-{
-  return 0;
-}
-!
-
-  if conftest EXTRA_FLAGS=-Wno-strict-aliasing ; then
-    printf -- "-Wno-strict-aliasing\n"
-    diag_flags="$diag_flags -Wno-strict-aliasing"
-  else
-    printf "unknown\n"
-  fi
-fi
-
 printf "Checking for intmax_t  ... "
 cat > conftest.c <<!
 #include <inttypes.h>