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On Linux, pretend we're building on Linux 2.6

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Setting the UNAME26 personality causes "uname" to return "2.6.x",
regardless of the kernel version.  This improves determinism in
a few misbehaved packages.
This commit is contained in:
Eelco Dolstra 2012-04-05 13:03:19 +02:00
parent 3b859ead37
commit f2467eb6a0
1 changed files with 11 additions and 0 deletions
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11
src/libstore/build.cc
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@ -1794,10 +1794,21 @@ void DerivationGoal::startBuilder()
throw SysError(format("changing into `%1%'") % tmpDir); throw SysError(format("changing into `%1%'") % tmpDir);
#ifdef CAN_DO_LINUX32_BUILDS #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" && thisSystem == "x86_64-linux") { if (drv.platform == "i686-linux" && thisSystem == "x86_64-linux") {
if (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -1) if (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -1)
throw SysError("cannot set i686-linux personality"); throw SysError("cannot set i686-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") &&
queryBoolSetting("build-impersonate-linux-26", true))
{
int cur = personality(0xffffffff);
if (cur != -1) personality(cur | 0x0020000 /* == UNAME26 */);
}
#endif #endif
/* Fill in the environment. */ /* Fill in the environment. */