Re: Which libgcc do I need to use? (link probs in CW project)
Re: Which libgcc do I need to use? (link probs in CW project)
- Subject: Re: Which libgcc do I need to use? (link probs in CW project)
- From: Markus Hitter <email@hidden>
- Date: Fri, 6 May 2005 23:26:43 +0200
Am 06.05.2005 um 19:21 schrieb Sean McBride:
I have found that the solution is to add libgcc.a to the CW project,
which XCode no doubt does implicitly.
gcc links against libgcc.a by default and Xcode uses gcc as the default
C compiler so, roughly, "yes".
However, I'm not sure about all this... which libgcc to use?
Try gcc's --verbose flag to see which subcommands gcc actually issues.
Compiling a trivial one-file tool on the command line might be
convenient.
Here on Mac OS X 10.3.9 with Xcode 1.5 installed and the default
compiler set to 3.3, I get:
Nobile:~$ gcc --verbose bla.c
[...]
ld -arch ppc -dynamic -o a.out -lcrt1.o -lcrt2.o
-L/usr/lib/gcc/darwin/3.3 -L/usr/lib/gcc/darwin
-L/usr/libexec/gcc/darwin/ppc/3.3/../../.. /var/tmp//ccvOP7qP.o -lgcc
-lSystem |
c++filt
The "-lgcc" tells you it uses a library named "libgcc.dylib", then
"libgcc.a". The -L flags form a list where to find this library. ld
will pick up the first it finds. See the ld man page.
there is a libgcc.a, libgcc_s.1.dylib, and libgcc_s.1.0.dylib, the .a
versions also
seem to have gcc-version-dependant variants.
My system shows only two, effectively:
Nobile:~$ locate libgcc | xargs ls -l
-r--r--r-- 1 root wheel 130216 11 Jun 2004
/usr/lib/gcc/darwin/3.1/libgcc.a
-r--r--r-- 1 root wheel 133660 6 Oct 2004
/usr/lib/gcc/darwin/3.3/libgcc.a
lrwxr-xr-x 1 root wheel 27 6 May 22:56 /usr/lib/libgcc.a ->
gcc/darwin/default/libgcc.a
Nobile:~$ ls -l /usr/lib/gcc/darwin/default
lrwxr-xr-x 1 root wheel 3 6 May 22:56 /usr/lib/gcc/darwin/default
-> 3.3
To summarize, /usr/lib/libgcc.a ist the one you want. Don't change the
default gcc compiler between compiling your libs and the entire app.
What is libgcc anyway? :)
A bunch of low level stuff which gcc developers think it fits neither
into the C runtime nor in one of the higher level libraries.
Hope That Helps,
Markus
- - - - - - - - - - - - - - - - - - -
Dipl. Ing. Markus Hitter
http://www.jump-ing.de/
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