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libbacktrace: check for sys/link.h

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QNX uses sys/link.h rather than link.h for dl_iterate_phdr

Fixes https://github.com/ianlancetaylor/libbacktrace/issues/86

	* configure.ac: Check for sys/link.h.  Use either link.h or
	sys/link.h when checking for dl_iterate_phdr.
	* elf.c: Include sys/link.h if available.
	* configure, config.h.in: Regenerate.
This commit is contained in:
Ian Lance Taylor 2022-07-08 10:28:24 -07:00
parent b984b84cbe
commit 55bb77b50a
4 changed files with 27 additions and 10 deletions
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3
libbacktrace/config.h.in
View File

@ -85,6 +85,9 @@
/* Define to 1 if you have the <sys/ldr.h> header file. */
#undef HAVE_SYS_LDR_H
/* Define to 1 if you have the <sys/link.h> header file. */
#undef HAVE_SYS_LINK_H
/* Define to 1 if you have the <sys/mman.h> header file. */
#undef HAVE_SYS_MMAN_H

17
libbacktrace/configure vendored
View File

@ -13267,26 +13267,31 @@ fi
# Check for dl_iterate_phdr.
for ac_header in link.h
for ac_header in link.h sys/link.h
do :
ac_fn_c_check_header_mongrel "$LINENO" "link.h" "ac_cv_header_link_h" "$ac_includes_default"
if test "x$ac_cv_header_link_h" = xyes; then :
as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
if eval test \"x\$"$as_ac_Header"\" = x"yes"; then :
cat >>confdefs.h <<_ACEOF
#define HAVE_LINK_H 1
#define `$as_echo "HAVE_$ac_header" | $as_tr_cpp` 1
_ACEOF
fi
done
if test "$ac_cv_header_link_h" = "no"; then
if test "$ac_cv_header_link_h" = "no" -a "$ac_cv_header_sys_link_h" = "no"; then
have_dl_iterate_phdr=no
else
if test -n "${with_target_subdir}"; then
link_h=link.h
if test "$ac_cv_header_link_h" = "no"; then
link_h=sys/link.h
fi
# When built as a GCC target library, we can't do a link test.
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
#include <link.h>
#include <$link_h>
_ACEOF
if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |

10
libbacktrace/configure.ac
View File

@ -335,13 +335,17 @@ fi
AC_SUBST(BACKTRACE_USES_MALLOC)
# Check for dl_iterate_phdr.
AC_CHECK_HEADERS(link.h)
if test "$ac_cv_header_link_h" = "no"; then
AC_CHECK_HEADERS(link.h sys/link.h)
if test "$ac_cv_header_link_h" = "no" -a "$ac_cv_header_sys_link_h" = "no"; then
have_dl_iterate_phdr=no
else
if test -n "${with_target_subdir}"; then
link_h=link.h
if test "$ac_cv_header_link_h" = "no"; then
link_h=sys/link.h
fi
# When built as a GCC target library, we can't do a link test.
AC_EGREP_HEADER([dl_iterate_phdr], [link.h], [have_dl_iterate_phdr=yes],
AC_EGREP_HEADER([dl_iterate_phdr], [$link_h], [have_dl_iterate_phdr=yes],
[have_dl_iterate_phdr=no])
else
AC_CHECK_FUNC([dl_iterate_phdr], [have_dl_iterate_phdr=yes],

7
libbacktrace/elf.c
View File

@ -40,7 +40,12 @@ POSSIBILITY OF SUCH DAMAGE. */
#include <unistd.h>
#ifdef HAVE_DL_ITERATE_PHDR
#include <link.h>
#ifdef HAVE_LINK_H
#include <link.h>
#endif
#ifdef HAVE_SYS_LINK_H
#include <sys/link.h>
#endif
#endif
#include "backtrace.h"