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Fix personality switching from x86_64 to i686

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On Linux, Nix can build i686 packages even on x86_64 systems.  It's not
enough to recognize this situation by settings.thisSystem, we also have
to consult uname().  E.g. we can be running on a i686 Debian with an
amd64 kernel.  In that situation settings.thisSystem is i686-linux, but
we still need to change personality to i686 to make builds consistent.
This commit is contained in:
Gergely Risko 2013-08-22 17:57:39 +02:00 committed by Eelco Dolstra
parent 03eaef3d7a
commit c6c024ca6f
1 changed files with 6 additions and 1 deletions
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7
src/libstore/build.cc
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@ -21,6 +21,7 @@
#include <sys/wait.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
@ -2173,7 +2174,11 @@ void DerivationGoal::initChild()
#ifdef CAN_DO_LINUX32_BUILDS
/* Change the personality to 32-bit if we're doing an
i686-linux build on an x86_64-linux machine. */
if (drv.platform == "i686-linux" && settings.thisSystem == "x86_64-linux") {
struct utsname utsbuf;
uname(&utsbuf);
if (drv.platform == "i686-linux" &&
(settings.thisSystem == "x86_64-linux" ||
(!strcmp(utsbuf.sysname, "Linux") && !strcmp(utsbuf.machine, "x86_64")))) {
if (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -1)
throw SysError("cannot set i686-linux personality");
}