That's a very good suggestion. Thanks. -Doug
2010/3/19 Joseph S. Myers <jos...@codesourcery.com>: > On Fri, 19 Mar 2010, Doug Kwan (Ãö®¶¼w) wrote: > >> Hi, >> >> I would like to get some advice on handling Android for x86 in >> tool configurations. Android is based on Linux but it is exactly the >> same, so some customizations are required. There was a discussion >> among people working on Android and someone suggested using >> i*86-unknown-android. My question is whether this is a good thing to >> do. I would also like to hear from the maintainer of the i*86 >> backend. Eventually we would like to see x86 Android modifications to >> be pushed up-stream. > > My inclination is that Android should use the same arrangements as the > existing support I added for different C libraries under the Linux kernel. > > *-*-linux-gnu* means a system defaulting to using the GNU C library. > *-*-linux-uclibc* means a system defaulting to using the uClibc library. > So *-*-linux-android* would mean a system defaulting to using Android's C > library. -mglibc selects a multilib based on the GNU C library in a > toolchain defaulting to uClibc; -muclibc selects a multilib based on > uClibc in a toolchain defaulting to the GNU C library. So -mandroid would > be added to these options, and *-*-linux* configurations could support > three C libraries. This means that configure tests in target libraries > that care about which C library is in use cannot be based on the target > triplet; they must check features or preprocessor macros (existing code in > libstdc++-v3 checks __UCLIBC__, for example). > > All the triplets above could have existing suffixes, so > i686-pc-linux-android, arm-none-linux-uclibceabi, > powerpc-none-linux-androidspe (for example) would be possible > combinations. > > The __linux__ preprocessor macro would be defined for all configurations > using the Linux kernel. __gnu_linux__ should only be defined for those > using the GNU C library (it's defined at present for those using uClibc as > well, but I think that's a bug). > > -- > Joseph S. Myers > jos...@codesourcery.com
