commit b7a17de454c9c2721059393d237f3984bd5aa74f Author: Nick Mathewson nickm@torproject.org Date: Mon Oct 21 13:30:38 2013 -0400

Better detection for certain broken cross-compiling situations.

Fixes bug 9869; patch from Benedikt Gollatz. --- changes/bug9869 | 7 +++++++ configure.ac | 17 +++++++++++++++++ 2 files changed, 24 insertions(+)

diff --git a/changes/bug9869 b/changes/bug9869 new file mode 100644 index 0000000..d67156d --- /dev/null +++ b/changes/bug9869 @@ -0,0 +1,7 @@ + o Minor features (build): + + - Assume that a user using configure --host wants to cross- + compile and error if we cannot find a properly named tool- + chain. Add --disable-tool-name-check to enable the user + to build nevertheless. Addresses ticket 9869. Patch by + Benedikt Gollatz. diff --git a/configure.ac b/configure.ac index f1fa881..8d21661 100644 --- a/configure.ac +++ b/configure.ac @@ -158,12 +158,29 @@ fi]) AC_ARG_ENABLE(bufferevents, AS_HELP_STRING(--enable-bufferevents, use Libevent's buffered IO.))

+AC_ARG_ENABLE(tool-name-check, + AS_HELP_STRING(--disable-tool-name-check, check for sanely named toolchain when cross-compiling)) + dnl check for the correct "ar" when cross-compiling AN_MAKEVAR([AR], [AC_PROG_AR]) AN_PROGRAM([ar], [AC_PROG_AR]) AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL([AR], [ar], [ar])]) AC_PROG_AR

+dnl Check whether the above macro has settled for a simply named tool even +dnl though we're cross compiling. We must do this before running AC_PROG_CC, +dnl because that will find any cc on the system, not only the cross-compiler, +dnl and then verify that a binary built with this compiler runs on the +dnl build system. It will then come to the false conclusion that we're not +dnl cross-compiling. +if test x$enable_tool_name_check != xno; then + if test x$ac_tool_warned = xyes; then + AC_MSG_ERROR([We are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)]) + elif test "x$ac_ct_AR" != x -a x$cross_compiling = xmaybe; then + AC_MSG_ERROR([We think we are cross compiling but could not find a properly named toolchain. Do you have your cross-compiling toolchain in PATH? (You can --disable-tool-name-check to ignore this.)]) + fi +fi + AC_PROG_CC AC_PROG_CPP AC_PROG_MAKE_SET