We have several bug reports for 4.6.0 about failures of the form checking dynamic linker characteristics... configure: error: Link tests are not allowed after GCC_NO_EXECUTABLES.
http://gcc.gnu.org/PR47836 http://gcc.gnu.org/PR46586 http://gcc.gnu.org/PR45174 http://gcc.gnu.org/PR39107 The problem arising when building a cross-compiler for a GNU/Linux target. Configure scripts like libiberty/configure.ac, libquadmath/configure.ac, etc., use GCC_NO_EXECUTABLES. The GCC_NO_EXECUTABLES macro checks whether a link succeeds. If it does not, it sets gcc_no_link. If a later attempt to run a link test, the above error is reported. Unfortunately, on a GNU/Linux host (recall that for a target library, the target is the host), libtool itself does a link test. From the top level libtool.m4 file, in _LT_SYS_DYNAMIC_LINKER, in the "linux* | k*bsd*-gnu | kopensolaris*-gnu" case: AC_LINK_IFELSE([AC_LANG_PROGRAM([],[])], [AS_IF([ ($OBJDUMP -p conftest$ac_exeext) 2>/dev/null | grep "RUNPATH.*$libdir" >/dev/null], [lt_cv_shlibpath_overrides_runpath=yes])]) That test fails when a link fails. That test must not be run when linking fails. Shortly after that code in libtool.m4, I see this: if test -f /etc/ld.so.conf; then lt_ld_extra=`awk '/^include / { system(sprintf("cd /etc; cat %s 2>/dev/null", \[$]2)); skip = 1; } { if (!skip) print \[$]0; skip = 0; }' < /etc/ld.so.conf | $SED -e 's/#.*//;/^[ ]*hwcap[ ]/d;s/[:, ]/ /g;s/=[^=]*$//;s/=[^= ]* / /g;s/"//g;/^$/d' | tr '\n' ' '` sys_lib_dlsearch_path_spec="/lib /usr/lib $lt_ld_extra" fi Testing /etc/ld.so.conf is absolutely meaningless when building a target library for a non-native compilation. That test must not be run when cross-compiling. We should definitely fix this for gcc 4.6.1. However, I don't know what the best way to fix this is. Our gcc-specific target libraries check $with_cross_host to see if they are being built as a cross-compiled target library. Presumably libtool doesn't want to check that. GCC_NO_EXECUTABLES sets a gcc-specific shell variable and overrides AC_LINK_IFELSE to test variable. libtool doesn't know anything about that. So what should we do here? Ian
