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| author | Richard Stallman <rms@gnu.org> | 1992-08-11 09:21:37 +0000 |
|---|---|---|
| committer | Richard Stallman <rms@gnu.org> | 1992-08-11 09:21:37 +0000 |
| commit | 001af587150d86c4548f998fba9ff3f6ad96781b (patch) | |
| tree | 23065eb38c983d654e80f98b74283a3278bf770d /gcc | |
| parent | b5c525860dc6e776b1ae2593bb9ed1a1b4fd42d8 (diff) | |
| download | gcc-001af587150d86c4548f998fba9ff3f6ad96781b.zip gcc-001af587150d86c4548f998fba9ff3f6ad96781b.tar.gz gcc-001af587150d86c4548f998fba9ff3f6ad96781b.tar.bz2 | |
(parser_build_binary_op): Warn about expressions like `1<=i<=N'.
From-SVN: r1794
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/c-typeck.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/gcc/c-typeck.c b/gcc/c-typeck.c index 0cd4bff..9297d48 100644 --- a/gcc/c-typeck.c +++ b/gcc/c-typeck.c @@ -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' |