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(parser_build_binary_op): Warn about expressions like `1<=i<=N'. 

From-SVN: r1794
This commit is contained in:
Richard Stallman 1992-08-11 09:21:37 +00:00
parent b5c525860d
commit 001af58715
1 changed files with 5 additions and 0 deletions
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5
gcc/c-typeck.c
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@ -2136,6 +2136,11 @@ parser_build_binary_op (code, arg1, arg2)
class = TREE_CODE_CLASS (TREE_CODE (result));
/* Similarly, check for cases like 1<=i<=10 that are probably errors. */
if (class == '<' && extra_warnings
&& (TREE_CODE_CLASS (code1) == '<' || TREE_CODE_CLASS (code2) == '<'))
warning ("comparisons like X<=Y<=Z do not have their mathematical meaning");
/* Record the code that was specified in the source,
for the sake of warnings about confusing nesting. */
if (class == 'e' || class == '1'