gcc/libcpp
Joseph Myers 3a4efce7c2 re PR preprocessor/55715 (bogus overflow warning for #if A-B when A<0 & B==minimum integer)
PR preprocessor/55715
libcpp:
	* expr.c (num_binary_op): Implement subtraction directly rather
	than with negation and falling through into addition case.

gcc/testsuite:
	* gcc.dg/cpp/expr-overflow-1.c: New test.

From-SVN: r205846
2013-12-10 01:23:37 +00:00
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