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Fix issues when compiling with clang (where cpp is provided by gcc
in the standalone toolchain).
diff -u -r ../ruby-2.3.1/configure.in ./configure.in
--- ../ruby-2.3.1/configure.in 2016-04-24 13:44:40.000000000 -0400
+++ ./configure.in 2016-05-18 01:10:09.523385169 -0400
@@ -799,7 +799,7 @@
rb_cv_warnflags="$warnflags"
if test "$GCC:${warnflags+set}:no" = yes::no; then
if test $gcc_major -ge 4; then
- extra_warning=-Werror=extra-tokens
+ extra_warning=
else
extra_warning=
fi
@@ -813,9 +813,7 @@
-Werror=pointer-arith \
-Werror=write-strings \
-Werror=declaration-after-statement \
- -Werror=shorten-64-to-32 \
-Werror=implicit-function-declaration \
- -Werror=division-by-zero \
-Werror=deprecated-declarations \
-Wno-packed-bitfield-compat \
$extra_warning \