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| author | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2012-04-05 13:03:19 +0200 |
|---|---|---|
| committer | Eelco Dolstra <eelco.dolstra@logicblox.com> | 2012-04-05 13:03:19 +0200 |
| commit | f2467eb6a0070176a5b1cd76aa330b84431f8258 (patch) | |
| tree | 10d2022765f81345d9e9ca5d18059ace6bff1c19 /src/libstore/build.cc | |
| parent | 3b859ead376cb0aa6c7b27774c2d82ed3ecb370a (diff) | |
On Linux, pretend we're building on Linux 2.6
Setting the UNAME26 personality causes "uname" to return "2.6.x",
regardless of the kernel version. This improves determinism in
a few misbehaved packages.
Diffstat (limited to 'src/libstore/build.cc')
| -rw-r--r-- | src/libstore/build.cc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc index 467f16597..c13ea6d23 100644 --- a/src/libstore/build.cc +++ b/src/libstore/build.cc @@ -1794,10 +1794,21 @@ void DerivationGoal::startBuilder() throw SysError(format("changing into `%1%'") % tmpDir); #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 (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -1) 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 /* Fill in the environment. */ |