I'm starting work on moving some code up from Mac OX X 10.3
and XCode 1.1's GCC 3.3 to Mac OS X 10.4 and XCode 2.2's
GCC 4.0.1. I'm not building in the XCode IDE; I'm calling
GCC and ld from shell scripts for reasons that are long and
complex and utterly unchangeable. The code is all C, with
no Objective-C or C++.
I found, somewhat to my surprise, that GCC doesn't generate
calls to saveFP and restFP at -O3, but does at -O1 and -O2.
In GCC 4.0.1, those routines are supplied by libgcc_static.a
in /usr/lib/gcc/powerpc-apple-darwin8/4.0.1, and when gcc
is driving ld itself, it includes that archive library
without any fuss.
However, that doesn't happen when I use ld to build a dylib.
That's fair enough in many ways: libgcc_static.a is clearly
quite tightly bound to that particular version of GCC. But
embedding the explicit path
/usr/lib/gcc/powerpc-apple-darwin8/4.0.1/libgcc_static.a
in my link script is not really attractive; it's the kind of
thing that could easily be forgotten when one upgrades to a
later GCC in a year's time. I'm using ld to build a dylib
because I couldn't find a satisfactory way to do it with
gcc or libtool. Here's the command line:
$export="/path/to/text/file/with/symbols/to/be/exported"
$archive="/path/to/archive/library/with/all/our/code/for/the/dylib"
ld -dylib -flat_namespace -single_module \
-dylib_compatibility_version 17.1 \
-headerpad_max_install_names \
-exported_symbols_list $export /usr/lib/dylib1.o \
-lSystem -lSystemStubs \
/usr/lib/gcc/powerpc-apple-darwin8/4.0.1/libgcc_static.a \
-o name.dylib
Can anyone suggest a better way to point ld at libgcc_static.a,
or to remove the need to do that?
"Build in the XCode IDE" isn't a usable answer.
thanks,
--
John Dallman, Parasolid Porting Engineer, +44-1223-371554
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