http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57753
Bug ID: 57753
Summary: FSF gcc bootstrap needs to use xcrun to bootstrap
post-darwin12
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: howarth at nitro dot med.uc.edu
The WWDC "What’s New in the LLVM Compiler" video on
https://developer.apple.com/wwdc/videos/ indicated that the SDK will be moved
out of / on future releases after Mountain Lion and that the proper way to find
the headers, previously in /usr/include and
/System/Library/Frameworks/*.framework/Headers is to use the xcrun tool on
darwin to access the compiler...
xcrun provides a means to locate or invoke coexistence- and platform-aware
developer tools from the com-
mand-line, without requiring users to modify makefiles or otherwise take
inconvenient measures to support
multiple Xcode tool chains.
The tool xcode-select is used to specify which installation of Xcode is
used, and may be overridden by the
DEVELOPER_DIR environment variable.
The SDK defaults to the boot system OS SDK, and can be specified by the
SDKROOT environment variable or the
-sdk option (which takes precedences over SDKROOT).
So the configure scripts for bootstrapping on darwin will need to be adjusted
to call compilers during the build using the xcrun command...
xcrun <tool_name> [<tool_arguments>]
We don't need to pass '-sdk SDK' as xcrun defaults to the deployment SDK. FYI,
this change can be tested on Mac OS X 10.7/10.8 using Xcode 4.6.3 by performing
the following steps...
sudo mv /usr/include /usr/include.off
sudo mv /System/Library/Frameworks/CoreFoundation.framework/Headers
/System/Library/Frameworks/CoreFoundation.framework/Headers.off
Note that the CoreFoundation.framework headers are used by the libasan build on
darwin.
