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| author | Richard Kenner <kenner@gcc.gnu.org> | 1997-04-13 12:49:45 -0400 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1997-04-13 12:49:45 -0400 |
| commit | 69375a37dead5fb85418ed6f652902a3d310bf2f (patch) | |
| tree | c7a4b057d177059ee52a1cd51006af2d845f5eb9 /gcc | |
| parent | 10c1b9f6899886fade41f1fc8c896d7143c4c18c (diff) | |
| download | gcc-69375a37dead5fb85418ed6f652902a3d310bf2f.zip gcc-69375a37dead5fb85418ed6f652902a3d310bf2f.tar.gz gcc-69375a37dead5fb85418ed6f652902a3d310bf2f.tar.bz2 | |
cexp.y (warn_undef): New variable.
(exp): Optionally warn about undefined identifiers that evaluate to 0.
From-SVN: r13877
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/cexp.y | 8 |
1 files changed, 7 insertions, 1 deletions
@@ -164,6 +164,9 @@ extern int traditional; /* Flag for -lang-c89. */ extern int c89; +/* Flag for -Wundef. */ +extern int warn_undef; + #ifndef CHAR_TYPE_SIZE #define CHAR_TYPE_SIZE BITS_PER_UNIT #endif @@ -445,7 +448,10 @@ exp : exp '*' exp | CHAR { $$ = yylval.integer; } | NAME - { $$.value = 0; + { if (warn_undef && !skip_evaluation) + warning ("`%.*s' is not defined", + $1.length, $1.address); + $$.value = 0; $$.signedp = SIGNED; } ; |