https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87030
--- Comment #22 from Iain Sandoe <iains at gcc dot gnu.org> --- Author: iains Date: Sat Aug 3 20:16:22 2019 New Revision: 274049 URL: https://gcc.gnu.org/viewcvs?rev=274049&root=gcc&view=rev Log: Darwin, backport fix for PR87030 273746 , 273749, 273768 [Darwin] Fix PR87030 and tidy config fragments. This is about 32/64b host and multilib support across the range of Darwin systems. Prior to Darwin8 (OS X 10.4), the toolchains support only PowerPC and only 32b. On Darwin8 it is possible to target a 64b multilib, but with support limited to a few of the main libraries on the system (not a recommended configuration). >From Darwin9 to Darwin17 (OSX 10.5 to 10.13) it is possible to have either 32 or 64b hosted toolchains, with support for a 64 or 32b multilib respectively. On Darwin9 the kernel is 32b, but with support for 64b executables, so it's conventional to build a 32b host toolchain supporting a 64b multilib. However this is not enforced (merely a convention). There is also some platform hardware supporting Darwin10/11 which is only 32b and for which the same situation applies. However, from Darwin10 to Darwin17, the majority of platform hardware supports a 64b kernel and it's conventional to build a 64b host toolchain with support for a 32b multilib. On/from Darwin18 (OS X 10.14), the development headers (in the SDK) no longer expose the interfaces for the 32b multilib support (although sufficient runtime support remains installed that the testsuite can be run for a 32b multilib). The PR is raised against this latter situation since the absence of exposed interfaces causes a 'default' bootstrap fail regardless of the availability of the runtimes. Given the number of permutations, I felt it warranted a general solution, especially since the current scheme of target headers and t-make fragments has become somewhat messy. The changes here enforce the single 32b PowerPC multilib for Darwin < 8 and the single X86 64b multilib for Darwin >= 18. This means that there is no longer any need to configure Darwin18+ '--disable-multilib', but also that if you want to use the ability to continue to test the compiler's 32b multilib there, you need to make a configuration targeting an earlier OS version (and using the SDK from that). 2019-08-03 Iain Sandoe <i...@sandoe.co.uk> Backport from mainline 2019-07-24 Iain Sandoe <i...@sandoe.co.uk> PR bootstrap/87030 * config/i386/darwin.h (REAL_LIBGCC_SPEC): Revert change from r273749. PR bootstrap/87030 * config/i386/darwin.h (REAL_LIBGCC_SPEC): Move from here... * config/i386/darwin32-biarch.h .. to here. * config/i386/darwin64-biarch.h: Adjust comments. * config/rs6000/darwin32-biarch.h: Likewise. * config/rs6000/darwin64-biarch.h: Likewise. * config.gcc: Missed commit from r273746 (*-*-darwin*): Don't include CPU t-darwin here. (i[34567]86-*-darwin*): Adjust to use biarch files. Produce an error message if i686-darwin configuration is attempted for Darwin >= 18. Backport from mainline 2019-07-23 Iain Sandoe <i...@sandoe.co.uk> PR bootstrap/87030 * config.gcc (*-*-darwin*): Don't include CPU t-darwin here. (i[34567]86-*-darwin*): Adjust to use biarch files. Produce an error message if i686-darwin configuration is attempted for Darwin >= 18. (x86_64-*-darwin*): Switch to single multilib for Darwin >= 18. (powerpc-*-darwin*): Use biarch files where needed. (powerpc64-*-darwin*): Likewise. * config/i386/darwin.h (REAL_LIBGCC_SPEC): Move to new biarch file. (DARWIN_ARCH_SPEC, DARWIN_SUBARCH_SPEC): Revise for default single arch case. * config/i386/darwin32-biarch.h: New. * config/i386/darwin64.h: Rename. * gcc/config/i386/darwin64-biarch.h: To this. * config/i386/t-darwin: Rename. * gcc/config/i386/t-darwin32-biarch: To this. * config/i386/t-darwin64: Rename. * gcc/config/i386/t-darwin64-biarch: To this. * config/rs6000/darwin32-biarch.h: New. * config/rs6000/darwin64.h: Rename. * config/rs6000/darwin64-biarch.h: To this. (DARWIN_ARCH_SPEC, DARWIN_SUBARCH_SPEC): Revise for default single arch case. * config/rs6000/t-darwin8: Rename. * config/rs6000/t-darwin32-biarch: To this. * config/rs6000/t-darwin64 Rename. * config/rs6000/t-darwin64-biarch: To this. Added: branches/gcc-9-branch/gcc/config/i386/darwin32-biarch.h branches/gcc-9-branch/gcc/config/i386/darwin64-biarch.h branches/gcc-9-branch/gcc/config/i386/t-darwin32-biarch branches/gcc-9-branch/gcc/config/i386/t-darwin64-biarch branches/gcc-9-branch/gcc/config/rs6000/darwin32-biarch.h branches/gcc-9-branch/gcc/config/rs6000/darwin64-biarch.h branches/gcc-9-branch/gcc/config/rs6000/t-darwin32-biarch branches/gcc-9-branch/gcc/config/rs6000/t-darwin64-biarch Removed: branches/gcc-9-branch/gcc/config/i386/darwin64.h branches/gcc-9-branch/gcc/config/i386/t-darwin branches/gcc-9-branch/gcc/config/i386/t-darwin64 branches/gcc-9-branch/gcc/config/rs6000/darwin64.h branches/gcc-9-branch/gcc/config/rs6000/t-darwin64 branches/gcc-9-branch/gcc/config/rs6000/t-darwin8 Modified: branches/gcc-9-branch/gcc/ChangeLog branches/gcc-9-branch/gcc/config.gcc branches/gcc-9-branch/gcc/config/i386/darwin.h branches/gcc-9-branch/gcc/config/rs6000/darwin.h
