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docs: Document usage with Xcode 4.1

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With Xcode 4.1 'gcc' is symlinked llvm-gcc-4.2 which cannot bootstrap
other gccs.
See http://llvm.org/bugs/show_bug.cgi?id=9571

On my machine the faulty gcc is
gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)

Document a workaround.

Signed-off-by: "Titus von Boxberg" <titus@v9g.de>
This commit is contained in:
Titus von Boxberg" 2011-08-22 09:36:30 +02:00 committed by Titus von Boxberg
parent 7af1d22c17
commit 2cdbc6e370
1 changed files with 18 additions and 4 deletions
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22
docs/C - Misc. tutorials.txt
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@ -55,7 +55,7 @@ toolchain on MacOS as host.
mount somewhere.
2) Install macports (or similar easy means of installing 3rd party software),
make sure that macport's bin dir is in your PATH.
make sure that macport's bin dir is in the front (!) of your PATH.
Furtheron assuming it is /opt/local/bin.
3) Install (at least) the following macports
@ -65,11 +65,25 @@ toolchain on MacOS as host.
gsed
gawk
gcc43 (only necessary for Leopard OSX 10.5)
gcc_select (only necessary for OSX 10.5, or Xcode > 4)
4) Prerequisites
On Leopard, make sure that the macport's gcc is called with the default
commands (gcc, g++,...), e.g. via macport gcc_select
commands (gcc, g++,...), via macport's gcc_select
4) run ct-ng's configure with the following tool configuration
On OSX 10.7 Lion / when using Xcode >= 4 make sure that the default commands
(gcc, g++, etc.) point to gcc-4.2, NOT llvm-gcc-4.2
by using macport's gcc_select feature. With MacPorts >= 1.9.2
the command is: "sudo port select --set gcc gcc42"
This also requires (like written above) that macport's bin dir
comes before standard directories in your PATH environment variable
because the gcc symlink is installed in /opt/local/bin and the default /usr/bin/gcc
is not removed by the gcc select command!
Explanation: llvm-gcc-4.2 (with Xcode 4.1 it is on my machine
"gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2335.15.00)")
cannot boostrap gcc. See http://llvm.org/bugs/show_bug.cgi?id=9571
5) run ct-ng's configure with the following tool configuration
(assuming you have installed the tools via macports in /opt/local):
./configure --with-sed=/opt/local/bin/gsed \
--with-libtool=/opt/local/bin/glibtool \
@ -79,7 +93,7 @@ toolchain on MacOS as host.
--with-readelf=/opt/local/bin/greadelf \
[...other configure parameters as you like...]
5) proceed as described in standard documentation
6) proceed as described in standard documentation
-----