Hello! gnulib is used by libvirt project (http://libvirt.org), and during cross-compiling libvirt i stumbled upon a problem in gnulib's autoconf module. The problem happens under the following conditions: --build=i686-mingw32 --host=arm-linux-gnueabihf Yes, i am cross-compiling Linux version of libvirt under Windows. It works fine except this small test. The problem is in the first line: --- cut --- if test "$as_ln_s" = "ln -s" && ln -s conftest.file conftest.sym; then AC_RUN_IFELSE( [AC_LANG_PROGRAM( [AC_INCLUDES_DEFAULT], [[struct stat sbuf; /* Linux will dereference the symlink and fail, as required by POSIX. That is better in the sense that it means we will not have to compile and use the lstat wrapper. */ return lstat ("conftest.sym/", &sbuf) == 0; ]])], [gl_cv_func_lstat_dereferences_slashed_symlink=yes], [gl_cv_func_lstat_dereferences_slashed_symlink=no], [case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; esac ]) else # If the 'ln -s' command failed, then we probably don't even # have an lstat function. gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" fi --- cut --- AC_RUN_IFELSE() is supposed to perfectly handle cross-compilation case and it knows that *-gnu* systems normally answer "yes" to this test. However, "$as_ln_s" = "ln -s" test spoils everything on MinGW because 'ln' is substituted by 'cp' there (because there is no support for symlinks in MinGW for historical reasons). I would suggest to fix this by explicit check for "cross-compiling" = "no" before attempting the whole thing: --- cut --- if test "$cross_compiling" = no; then --- the whole original AC_RUN_IFELSE() thing goes here, except cross-compile fragment --- else # cross-compiling case "$host_os" in # Guess yes on glibc systems. *-gnu*) gl_cv_func_lstat_dereferences_slashed_symlink="guessing yes" ;; # If we don't know, assume the worst. *) gl_cv_func_lstat_dereferences_slashed_symlink="guessing no" ;; esac fi --- cut --- Anyway, this test makes no sense when build != host.
Kind regards, Pavel Fedin Expert Engineer Samsung Electronics Research center Russia
