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6c1305515d
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@13604 72102866-910b-0410-8b05-ffd578937521
43 lines
1.4 KiB
Text
43 lines
1.4 KiB
Text
AC_DEFUN(OBJC_CON_AUTOLOAD,
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#--------------------------------------------------------------------
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# Guess if we are using a object file format that supports automatic
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# loading of constructor functions.
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#
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# If this system supports autoloading of constructors, that means that gcc
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# doesn't have to do it for us via collect2. This routine tests for this
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# in a very roundabout way by compiling a program with a constructor and
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# testing the file, via nm, for certain symbols that collect2 includes to
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# handle loading of constructors.
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#
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# Makes the following substitutions:
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# Defines CON_AUTOLOAD (whether constructor functions are autoloaded)
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#--------------------------------------------------------------------
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[dnl
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AC_MSG_CHECKING(loading of constructor functions)
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AC_CACHE_VAL(objc_cv_con_autoload,
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[dnl
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cat > conftest.constructor.c <<EOF
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void cons_functions() __attribute__ ((constructor));
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void cons_functions() {}
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int main()
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{
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return 0;
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}
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EOF
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${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.constructor.$ac_ext $LIBS 1>&5
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case "$target_os" in
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cygwin*) objc_cv_con_autoload=yes;;
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*) if test -n "`nm conftest${ac_exeext} | grep global_ctors`"; then
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objc_cv_con_autoload=yes
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else
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objc_cv_con_autoload=no
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fi ;;
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esac
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])
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if test $objc_cv_con_autoload = yes; then
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AC_MSG_RESULT(yes)
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AC_DEFINE(CON_AUTOLOAD,1,[Define if constructors are automatically loaded])
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else
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AC_MSG_RESULT(no)
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fi
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])
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