https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215455
Bug ID: 215455
Summary: AdressSanitizer provides memalign() confusing
consumers
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-toolchain@FreeBSD.org
Reporter: jbe...@freebsd.org
Some build systems test symbol availability without prototypes in case of
broken/incomplete headers or due to simplicity. For one, Firefox has
AC_CHECK_FUNCS(memalign) which fails on FreeBSD but defines HAVE_MEMALIGN with
ASan. The code can be unwrapped into the following:
$ cat a.c
char memalign();
int main()
{
memalign();
return 0;
}
$ cc a.c -fsanitize=address
$ echo $?
0
$ cc a.c
/tmp/a-294bd8.o: In function `main':
a.c:(.text+0x12): undefined reference to `memalign'
$ echo $?
1
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