Benjamin, At 10:36 2002-11-04, you wrote:
How can I prevent cygwin gcc from producing symbols with leading underscores? ("_main" instead "main")Binary compatible? That really has little meaning since there's far more to binary compatibility than how symbols from the program source code are or are not adorned when emitted into the object code files.
I want to be binary compatible with linux and other operating systems.
What about libgcc.a? Each symbol conatins leading underscores, can I change this?
cygwin.dll defines both exports, with and without leading underscores isn't it?
Apparently it can be changed. If GCC under Linux doesn't prepend the underscore and under Cygwin it does, then it's at some level configurable. Get the GCC book ("Using and Porting GNUCC").
This excerpt from the output of "gcc -dumpspecs" suggests leading underscores is a configurable option (though I don't know why both "leading-underscore" and "no-leading-underscore" are listed:
-==-
*cpp_options:
%(cpp_unique_options) %{std*} %{d*} %{W*} %{w} %{pedantic*} %{fshow-column} %{fno-show-column} %{fsigned-char&funsigned-char} %{fleading-underscore} %{fno-leading-underscore} %{fno-operator-names} %{ftabstop=*}
-==-
So you can use:
-fleading-underscore External symbols have a leading underscore
Here's some mildly interesting output:
% gcc -v --help 2>&1 |egrep -i '(leading)|(underscore)'
-fleading-underscore External symbols have a leading underscore
-fno-underscoring Disable the appending of underscores to externals
-fno-second-underscore Never append a second underscore to externals
Anyway, there's a lot to GCC. Read up on it and you'll probably find out about other things you'll need to know to get your binary compatibility.
Benjamin Kalytta
Randall Schulz Mountain View, CA USA -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Bug reporting: http://cygwin.com/bugs.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
