ObjFW  Diff

Differences From Artifact [c6b89e288b]:

• File configure.ac — part of check-in [a889f21180] at 2013-05-22 20:36:31 on branch trunk — Don't depened on execinfo.h for backtraces.

  Instead, __builtin_return_address() is used now. This makes backtraces
  available on many platforms, it even works if dladdr is missing (it does
  not show symbol names then, though). (user: js, size: 22738) [annotate] [blame] [check-ins using]

To Artifact [fe25322d35]:

• File configure.ac — part of check-in [f2a8bdf254] at 2013-05-25 11:40:28 on branch trunk — Switch back to backtrace().

  The reason is that __builtin_frame_address(n) for n > 0 seems to just
  crash on most platforms when -fomit-stack-pointer is specified, which
  seems to be the default for many platforms on -O2. The documentation
  says that __builtin_frame_address() should return NULL in case it can't
  get the frame, but it seems to crash instead.

  Therefore, this commit reverts to using backtrace() from execinfo.h, if
  available. However, as __builtin_frame_address() seems to always work on
  PPC (even with -fomit-frame-pointer) and seems to be the only way to get
  a backtrace on the Wii, this is still used if backtrace() is unavailable
  and __ppc__ defined. (user: js, size: 23054) [annotate] [blame] [check-ins using]

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		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])


AC_MSG_CHECKING(for __builtin_return_address)
AC_TRY_LINK([], [
	__builtin_return_address(0);
], [
	AC_MSG_RESULT(yes)
	AC_DEFINE(HAVE_BUILTIN_RETURN_ADDRESS, 1,
		[Whether we have __builtin_return_address])
], [
	AC_MSG_RESULT(no)











])

AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
		AC_SUBST(BRIDGE, "bridge")

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		;;
esac
AS_IF([test x"$have_processes" = x"yes"], [
	AC_SUBST(OFPROCESS_M, "OFProcess.m")
	AC_DEFINE(OF_HAVE_PROCESSES, 1, [Whether we have processes])
])

AC_DEFUN([CHECK_BUILTIN_RETURN_ADDRESS], [
	AC_MSG_CHECKING(for __builtin_return_address)
	AC_TRY_LINK([], [
		__builtin_return_address(1);
	], [
		AC_MSG_RESULT(yes)
		AC_DEFINE(HAVE_BUILTIN_RETURN_ADDRESS, 1,
			[Whether we have __builtin_return_address])
	], [
		AC_MSG_RESULT(no)
	])
])
AC_CHECK_HEADER(execinfo.h, [
	AC_DEFINE(HAVE_EXECINFO_H, 1, [Whether we have execinfo.h])
	AC_CHECK_FUNC(backtrace, [
		AC_DEFINE(HAVE_BACKTRACE, 1, [Whether we have backtrace()])
	], [
		CHECK_BUILTIN_RETURN_ADDRESS
	])
], [
	CHECK_BUILTIN_RETURN_ADDRESS
])

AS_IF([test x"$objc_runtime" = x"Apple runtime"], [
	AC_CHECK_HEADER(Foundation/NSObject.h, [
		AC_SUBST(FOUNDATION_COMPAT_M, "foundation-compat.m")
		AC_SUBST(BRIDGE, "bridge")