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Sourcery CodeBench and modern FSF Mips toolchains require a bit more
complicated algorithm to calculate headers, libraries and sysroot paths
than implemented by Clang driver now. The main problem is that all these
paths depend on a set of command line arguments additionally to a target
triple value. For example, let $TC is a toolchain installation directory.
If we compile big-endian 32-bit mips code, crtbegin.o is in the
$TC/lib/gcc/mips-linux-gnu/4.7.2 folder and the toolchain's linker requires
--sysroot=$TC/mips-linux-gnu/libc argument. If we compile little-endian
32-bit soft-float mips code, crtbegin.o is in the
$TC/lib/gcc/mips-linux-gnu/4.7.2/soft-float/el folder and the toolchain's
linker requires --sysroot=$TC/mips-linux-gnu/libc/soft-float/el argument.
1. Calculate MultiarchSuffix using all necessary command line options and
use this MultiarchSuffix to detect crtbegin.o location in the
GCCInstallationDetector::ScanLibDirForGCCTriple() routine.
2. If a user does not provide --sysroot argument to the driver explicitly,
calculate new sysroot value based on command line options. Then use this
calculated sysroot path:
a. To populate a file search paths list in the Linux::Linux() constructor.
b. To find Mips toolchain specific include headers directories
in the Linux::AddClangSystemIncludeArgs() routine.
c. To provide -–sysroot argument for a linker.
Note:
- The FSF's tree slightly differs (folder names) and is not supported
yet.
- New addExternCSystemIncludeIfExits() routine is a temporary solution.
I plan to move path existence check to the addExternCSystemInclude()
routine by a separate commit.
The patch reviewed by Rafael Espindola.
http://llvm-reviews.chandlerc.com/D644
llvm-svn: 179934
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