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assert.h: allow gcc to detect assert(a = 1) errors

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* assert/assert.h (assert): Rewrite assert's definition so that
a s/==/=/ typo, e.g., assert(errno = ENOENT) is not hidden from
gcc's -Wparentheses by assert-added parentheses.  The new definition
uses "if (expr) /* empty */; else __assert_fail...", so
gcc -Wall will now detect that type of error in an assert, too.
The __STRICT_ANSI__ disjunct is to make this work also with both
-ansi and  -pedantic, which would reject the use of ({...}).
I would have preferred to use __extension__ to mark that, but
doing so would mistakenly suppress warnings about any extension
in the user-supplied "expr".
E.g., "assert ( ({1;}) )" must continue to evoke a warning.
This commit is contained in:
Jim Meyering 2014-06-05 10:42:05 -07:00
parent 009ba649b4
commit e077349ce5
2 changed files with 25 additions and 4 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2016-11-25 Jim Meyering <meyering@fb.com>
Let gcc detect assert(a = 1) errors.
* assert/assert.h (assert) Rewrite, retaining the old definintion
when required, but otherwise putting the expression as-is in an "if"
expression (hence, with no added parentheses) within a statement
expression.
2016-12-17 Siddhesh Poyarekar <siddhesh@sourceware.org>
* benchtests/Makefile (binaries-benchset): Depend on libsupport

21
assert/assert.h
View File

@ -82,10 +82,23 @@ extern void __assert (const char *__assertion, const char *__file, int __line)
__END_DECLS
# define assert(expr) \
((expr) \
? __ASSERT_VOID_CAST (0) \
: __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
/* When possible, define assert so that it does not add extra
parentheses around EXPR. Otherwise, those added parentheses would
suppress warnings we'd expect to be detected by gcc's -Wparentheses. */
# if !defined __GNUC__ || defined __STRICT_ANSI__
# define assert(expr) \
((expr) \
? __ASSERT_VOID_CAST (0) \
: __assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION))
# else
# define assert(expr) \
({ \
if (expr) \
; /* empty */ \
else \
__assert_fail (#expr, __FILE__, __LINE__, __ASSERT_FUNCTION); \
})
# endif
# ifdef __USE_GNU
# define assert_perror(errnum) \