I spent a few days over the holidays getting libc++ working on Leopard/Intel.
Over the past week or so, I've tested this configuration and fixed various
issues that surfaced. As I now have all of my normal ports built and installed
on Leopard in this configuration, I think it's now ready for a wider audience.
This brings a modern toolchain back to OS X Leopard, so users still on that old
OS can have C++11 and C++14 support and install ports that require it. These
instructions apply to Snow Leopard as well. Snow Leopard has had this support
since the end of 2012, but I don't think I ever sent out detailed instructions,
and the bootstrapping is much simpler now as well.
Please make sure you have a recent checkout (svn r131400 or newer) as I
recently pushed changes to the ports tree to work around some bootstrapping
issues.
=== libc++ on Leopard and Snow Leopard with MacPorts ===
Leopard and Snow Leopard do not include libc++ and libc++abi, so you will first
need to install it and then rebuild your ports with the new configuration.
1) If on Leopard, see the Manual Leopard SDK Fixes below first.
2) Install MacPorts and its dependencies as you normally would or start with an
existing up-to-date install.
3) Install the libcxx port. When it activates, the libcxxabi and libcxx ports
will install libc++.dylib and libc++abi.dylib to the system (which will remain
after you uninstall MacPorts). This will pull in a number of dependencies.
sudo port -v -s install libcxx
4) Deactivate all your active ports (or at least the C++ ports) in order to
prepare to rebuild them, and then activate just the new toolchain:
sudo port -v -f deactivate active
sudo port -v install clang-3.4 ld64 cctools
5) Edit /opt/local/etc/macports/macports.conf to contain:
cxx_stdlib libc++
delete_la_files yes
default_compilers macports-clang-3.4 macports-clang-3.3 gcc-4.2
apple-gcc-4.2 gcc-4.0
6) Uninstall all the remaining inactive ports:
sudo port -v -f uninstall inactive
7) Rebuild llvm-3.4 and clang-3.4 to use libc++, using clang-3.5:
sudo port -v install clang-3.5
sudo port -v uninstall llvm-3.4 clang-3.4
sudo port -v install clang-3.4 configure.compiler=macports-clang-3.5
8) Add macports-clang-3.5 or newer to default_compilers in
/opt/local/etc/macports/macports.conf if you want.
9) Install other ports as you normally would.
=== Manual Leopard SDK Fixes (apply to / and /Developer/SDKs/MacOSX10.5.sdk) ===
Leopard's SDK has a couple bugs which were never fixed in an update of Xcode or
the OS. You'll need to make these fixes yourself.
1) Update /usr/lib/libgcc_s.10.5.dylib from a newer OS (to get the missing
stubs for __udivti3 and others):
sudo cp /usr/lib/libgcc_s.10.5.dylib{,.bak}
sudo scp <snow leopard or newer machine>:/usr/lib/libgcc_s.10.5.dylib
/usr/lib/libgcc_s.10.5.dylib
You will know that this worked successfully if you can compile this
with clang-mp-3.4:
int main() {
__uint128_t a = 100;
__uint128_t b = 200;
__uint128_t c = a / b;
return 0;
}
2) Edit /usr/include/AvailabilityInternal.h, so ports don't try to use API that
were added in Snow Leopard:
--- /usr/include/AvailabilityInternal.h 2008-04-29 21:45:28.000000000
-0700
+++ /usr/include/AvailabilityInternal.h 2014-11-12 20:07:12.000000000
-0800
@@ -60,7 +60,7 @@
#define __MAC_OS_X_VERSION_MIN_REQUIRED
__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__
// make sure a default max version is set
#ifndef __MAC_OS_X_VERSION_MAX_ALLOWED
- #define __MAC_OS_X_VERSION_MAX_ALLOWED __MAC_10_6
+ #define __MAC_OS_X_VERSION_MAX_ALLOWED 1058
#endif
// set up internal macros
You may be tempted to use __MAC_10_5 instead of 1058 there to match
what is done on Snow Leopard and later SDKs, but that will fail with Leopard's
default toolchain because it sets the deployment target to the full OS version
(eg 10.5.8), and that needs to be less than or equal to
__MAC_OS_X_VERSION_MAX_ALLOWED.
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