diff options
Diffstat (limited to 'gcc/cexp.y')
| -rw-r--r-- | gcc/cexp.y | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/gcc/cexp.y b/gcc/cexp.y index 2d2d34f8b28..133539f6c5d 100644 --- a/gcc/cexp.y +++ b/gcc/cexp.y @@ -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; } ; |