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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [config/] [weakref.m4] - Blame information for rev 722

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Line No. Rev Author Line
1 722 jeremybenn
 
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dnl Check if the target supports weak.
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AC_DEFUN([GCC_CHECK_ATTRIBUTE_WEAK], [
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  AC_CACHE_CHECK([whether the target supports weak],
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                 ac_cv_have_attribute_weak, [
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  weakref_m4_saved_CFLAGS="$CFLAGS"
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  CFLAGS="$CFLAGS -Werror"
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  AC_TRY_COMPILE([void __attribute__((weak)) foo(void) { }],
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                 [], ac_cv_have_attribute_weak=yes,
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                 ac_cv_have_attribute_weak=no)
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  CFLAGS="$weakref_m4_saved_CFLAGS"])
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  if test x"$ac_cv_have_attribute_weak" = xyes; then
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    AC_DEFINE(HAVE_ATTRIBUTE_WEAK, 1,
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      [Define to 1 if the target supports __attribute__((weak)).])
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  fi])
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dnl Check whether weak refs work like the ELF ones.
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dnl This means that the weak reference works without having to satify
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dnl linkage for the item.
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dnl There are targets (at least Darwin) where we have fully functional
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dnl weakrefs at runtime, but must supply the referenced item at link time.
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AC_DEFUN([GCC_CHECK_ELF_STYLE_WEAKREF], [
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  AC_CACHE_CHECK([whether weak refs work like ELF],
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                  ac_cv_have_elf_style_weakref, [
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  weakref_m4_saved_CFLAGS="$CFLAGS"
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  case "${host}" in
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    *-apple-darwin*) CFLAGS="$CFLAGS -Wl,-undefined,dynamic_lookup" ;;
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    *) ;;
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  esac
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  AC_RUN_IFELSE([AC_LANG_SOURCE([[
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extern void fNotToBeFound(void) __attribute__((weak));
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int main ()
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{
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  if (fNotToBeFound)
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    return 1;
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  else
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    return 0;
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}
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]])], ac_cv_have_elf_style_weakref=yes, ac_cv_have_elf_style_weakref=no, [
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case "${host}" in
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  alpha*-dec-osf*) ac_cv_have_elf_style_weakref=no ;;
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  *-apple-darwin[[89]]*) ac_cv_have_elf_style_weakref=no ;;
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  *) ac_cv_have_elf_style_weakref=yes;;
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esac])CFLAGS="$weakref_m4_saved_CFLAGS"])
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if test x"$ac_cv_have_elf_style_weakref" = xyes; then
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  AC_DEFINE(HAVE_ELF_STYLE_WEAKREF, 1, [Define to 1 if target has a weakref that works like the ELF one.])
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fi])
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