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* Support i686-linux builds directly on x86_64-linux Nix

Browse source 
installations.  This is implemented using the personality() syscall,
  which causes uname to return "i686" in child processes.
This commit is contained in:
Eelco Dolstra 2009-01-12 16:30:32 +00:00
parent 8e39d9bdb3
commit c504d90c11
2 changed files with 24 additions and 2 deletions
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7
configure.ac
View file

@ -100,12 +100,17 @@ AC_CHECK_HEADERS([sys/mount.h], [], [],
])
# Check for <locale>
# Check for <locale>.
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([locale], [], [], [])
AC_LANG_POP(C++)
# Check whether we have the personality() syscall, which allows us to
# do i686-linux builds on x86_64-linux machines.
AC_CHECK_HEADERS([sys/personality.h])
AC_DEFUN([NEED_PROG],
[
AC_PATH_PROG($1, $2)

19
src/libstore/build.cc
View file

@ -40,6 +40,12 @@
#define CHROOT_ENABLED HAVE_CHROOT && HAVE_UNSHARE && HAVE_SYS_MOUNT_H && defined(MS_BIND) && defined(CLONE_NEWNS)
#if HAVE_SYS_PERSONALITY_H
#include <sys/personality.h>
#define CAN_DO_LINUX32_BUILDS
#endif
namespace nix {
using std::map;
@ -1474,7 +1480,11 @@ void DerivationGoal::startBuilder()
format("building path(s) %1%") % showPaths(outputPaths(drv.outputs)))
/* Right platform? */
if (drv.platform != thisSystem)
if (drv.platform != thisSystem
#ifdef CAN_DO_LINUX32_BUILDS
&& !(drv.platform == "i686-linux" && thisSystem == "x86_64-linux")
#endif
)
throw BuildError(
format("a `%1%' is required to build `%3%', but I am a `%2%'")
% drv.platform % thisSystem % drvPath);
@ -1806,6 +1816,13 @@ void DerivationGoal::startBuilder()
initChild();
#ifdef CAN_DO_LINUX32_BUILDS
if (drv.platform == "i686-linux" && thisSystem == "x86_64-linux") {
if (personality(PER_LINUX32_3GB) == -1)
throw SysError("cannot set i686-linux personality");
}
#endif
/* Fill in the environment. */
Strings envStrs;
for (Environment::const_iterator i = env.begin();