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re PR sanitizer/77631 (no symbols in backtrace shown by ASan when debug info is split)

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PR sanitizer/77631
	* configure.ac: Check for lstat and readlink.
	* elf.c (lstat, readlink): Provide dummy versions if real versions
	are not available.
	* configure, config.h.in: Rebuild.

From-SVN: r253095
This commit is contained in:
Ian Lance Taylor 2017-09-22 13:38:10 +00:00 committed by Ian Lance Taylor
parent 4d6e2f33a4
commit 8c2ea6b20a
5 changed files with 57 additions and 0 deletions

8
libbacktrace/ChangeLog

@ -1,3 +1,11 @@
2017-09-22 Ian Lance Taylor <iant@golang.org>
PR sanitizer/77631
* configure.ac: Check for lstat and readlink.
* elf.c (lstat, readlink): Provide dummy versions if real versions
are not available.
* configure, config.h.in: Rebuild.
2017-09-21 Ian Lance Taylor <iant@google.com>
PR go/82284

6
libbacktrace/config.h.in

@ -37,9 +37,15 @@
/* Define if AIX loadquery is available. */
#undef HAVE_LOADQUERY
/* Define to 1 if you have the `lstat' function. */
#undef HAVE_LSTAT
/* Define to 1 if you have the <memory.h> header file. */
#undef HAVE_MEMORY_H
/* Define to 1 if you have the `readlink' function. */
#undef HAVE_READLINK
/* Define to 1 if you have the <stdint.h> header file. */
#undef HAVE_STDINT_H

13
libbacktrace/configure vendored

@ -12708,6 +12708,19 @@ cat >>confdefs.h <<_ACEOF
#define HAVE_DECL_STRNLEN $ac_have_decl
_ACEOF
for ac_func in lstat readlink
do :
as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
eval as_val=\$$as_ac_var
if test "x$as_val" = x""yes; then :
cat >>confdefs.h <<_ACEOF
#define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
_ACEOF
fi
done
# Check for getexecname function.
if test -n "${with_target_subdir}"; then

1
libbacktrace/configure.ac

@ -373,6 +373,7 @@ if test "$have_fcntl" = "yes"; then
fi
AC_CHECK_DECLS(strnlen)
AC_CHECK_FUNCS(lstat readlink)
# Check for getexecname function.
if test -n "${with_target_subdir}"; then

29
libbacktrace/elf.c

@ -75,6 +75,35 @@ xstrnlen (const char *s, size_t maxlen)
#endif
#ifndef HAVE_LSTAT
/* Dummy version of lstat for systems that don't have it. */
static int
xlstat (const char *path ATTRIBUTE_UNUSED, struct stat *st ATTRIBUTE_UNUSED)
{
return -1;
}
#define lstat xlstat
#endif
#ifndef HAVE_READLINK
/* Dummy version of readlink for systems that don't have it. */
static ssize_t
xreadlink (const char *path ATTRIBUTE_UNUSED, char *buf ATTRIBUTE_UNUSED,
size_t bufsz ATTRIBUTE_UNUSED)
{
return -1;
}
#define readlink xreadlink
#endif
#ifndef HAVE_DL_ITERATE_PHDR
/* Dummy version of dl_iterate_phdr for systems that don't have it. */