diff options
| -rw-r--r-- | doc/guix.texi | 9 | ||||
| -rw-r--r-- | nix/libstore/build.cc | 8 |
2 files changed, 16 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index a12210db8a..005c0597ad 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -5855,9 +5855,16 @@ information on cross-compilation. An example use of this is on Linux-based systems, which can emulate different personalities. For instance, passing -@code{--system=i686-linux} on an @code{x86_64-linux} system allows you +@code{--system=i686-linux} on an @code{x86_64-linux} system or +@code{--system=armhf-linux} on an @code{aarch64-linux} system allows you to build packages in a complete 32-bit environment. +@quotation Note +Building for an @code{armhf-linux} system is unconditionally enabled on +@code{aarch64-linux} machines, although certain aarch64 chipsets do not +allow for this functionality, notably the ThunderX. +@end quotation + Similarly, when transparent emulation with QEMU and @code{binfmt_misc} is enabled (@pxref{Virtualization Services, @code{qemu-binfmt-service-type}}), you can build for any system for diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc index 34647e6774..c7f32494d0 100644 --- a/nix/libstore/build.cc +++ b/nix/libstore/build.cc @@ -1244,6 +1244,7 @@ static bool canBuildLocally(const string & platform) return platform == settings.thisSystem #if __linux__ || (platform == "i686-linux" && settings.thisSystem == "x86_64-linux") + || (platform == "armhf-linux" && settings.thisSystem == "aarch64-linux") #endif ; } @@ -2220,6 +2221,13 @@ void DerivationGoal::runChild() throw SysError("cannot set i686-linux personality"); } + if (drv.platform == "armhf-linux" && + (settings.thisSystem == "aarch64-linux" || + (!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "aarch64")))) { + if (personality(PER_LINUX32) == -1) + throw SysError("cannot set armhf-linux personality"); + } + /* Impersonate a Linux 2.6 machine to get some determinism in builds that depend on the kernel version. */ if ((drv.platform == "i686-linux" || drv.platform == "x86_64-linux") && settings.impersonateLinux26) { |