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Dallman, John wrote:
| 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
Use the compiler driver to link, replace gcc with g++ if linking c++ code.
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