[src/trunk]: src/tests/usr.bin/xlint/lint1 tests/lint: explain global variabl...

[rillig <rillig%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/fe8f9ac94e78
branches:  trunk
changeset: 1022390:fe8f9ac94e78
user:      rillig <rillig%NetBSD.org@localhost>
date:      Thu Jul 15 17:48:10 2021 +0000

description:
tests/lint: explain global variables in __attribute__

diffstat:

 tests/usr.bin/xlint/lint1/expr_precedence.c   |  12 ++++++++++--
 tests/usr.bin/xlint/lint1/expr_precedence.exp |   4 ++--
 2 files changed, 12 insertions(+), 4 deletions(-)

diffs (36 lines):

diff -r 2c09aecf0ca3 -r fe8f9ac94e78 tests/usr.bin/xlint/lint1/expr_precedence.c
--- a/tests/usr.bin/xlint/lint1/expr_precedence.c       Thu Jul 15 17:20:57 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/expr_precedence.c       Thu Jul 15 17:48:10 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: expr_precedence.c,v 1.2 2021/07/15 17:20:58 rillig Exp $       */
+/*     $NetBSD: expr_precedence.c,v 1.3 2021/07/15 17:48:10 rillig Exp $       */
 # 3 "expr_precedence.c"
 
 /*
@@ -22,7 +22,15 @@
  * don't make sense at that point.
  */
 void __attribute__((format(printf,
-    /* expect+2: error: 'var' undefined [99] */ /* XXX: why? */
+    /*
+     * Inside of __attribute__((...)), symbol lookup works differently.  For
+     * example, 'printf' is a keyword, and since all arguments to
+     * __attribute__ are constant expressions, looking up global variables
+     * would not make sense.  Therefore, 'var' is undefined.
+     *
+     * See lex.c, function 'search', keyword 'attron'.
+     */
+    /* expect+2: error: 'var' undefined [99] */
     /* expect+1: syntax error '=' [249] */
     var = 1,
     /* Syntactically ok, must be a constant expression though. */
diff -r 2c09aecf0ca3 -r fe8f9ac94e78 tests/usr.bin/xlint/lint1/expr_precedence.exp
--- a/tests/usr.bin/xlint/lint1/expr_precedence.exp     Thu Jul 15 17:20:57 2021 +0000
+++ b/tests/usr.bin/xlint/lint1/expr_precedence.exp     Thu Jul 15 17:48:10 2021 +0000
@@ -1,4 +1,4 @@
 expr_precedence.c(15): error: syntax error '4' [249]
 expr_precedence.c(18): error: non-constant initializer [177]
-expr_precedence.c(27): error: 'var' undefined [99]
-expr_precedence.c(27): error: syntax error '=' [249]
+expr_precedence.c(35): error: 'var' undefined [99]
+expr_precedence.c(35): error: syntax error '=' [249]