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-rw-r--r--nix/libstore/build.cc23
1 files changed, 14 insertions, 9 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index 275d6a5f7c..34647e6774 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1682,15 +1682,6 @@ void DerivationGoal::startBuilder()
f.exceptions(boost::io::all_error_bits ^ boost::io::too_many_args_bit);
startNest(nest, lvlInfo, f % showPaths(missingPaths) % curRound % nrRounds);
- /* Right platform? */
- if (!canBuildLocally(drv.platform)) {
- if (settings.printBuildTrace)
- printMsg(lvlError, format("@ unsupported-platform %1% %2%") % drvPath % drv.platform);
- throw Error(
- format("a `%1%' is required to build `%3%', but I am a `%2%'")
- % drv.platform % settings.thisSystem % drvPath);
- }
-
/* Note: built-in builders are *not* running in a chroot environment so
that we can easily implement them in Guile without having it as a
derivation input (they are running under a separate build user,
@@ -2311,6 +2302,20 @@ void DerivationGoal::runChild()
execve(drv.builder.c_str(), stringsToCharPtrs(args).data(), stringsToCharPtrs(envStrs).data());
+ int error = errno;
+
+ /* Right platform? Check this after we've tried 'execve' to allow for
+ transparent emulation of different platforms with binfmt_misc
+ handlers that invoke QEMU. */
+ if (error == ENOEXEC && !canBuildLocally(drv.platform)) {
+ if (settings.printBuildTrace)
+ printMsg(lvlError, format("@ unsupported-platform %1% %2%") % drvPath % drv.platform);
+ throw Error(
+ format("a `%1%' is required to build `%3%', but I am a `%2%'")
+ % drv.platform % settings.thisSystem % drvPath);
+ }
+
+ errno = error;
throw SysError(format("executing `%1%'") % drv.builder);
} catch (std::exception & e) {