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.
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@ -1794,10 +1794,21 @@ void DerivationGoal::startBuilder()
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throw SysError(format("changing into `%1%'") % tmpDir);
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#ifdef CAN_DO_LINUX32_BUILDS
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/* Change the personality to 32-bit if we're doing an
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i686-linux build on an x86_64-linux machine. */
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if (drv.platform == "i686-linux" && thisSystem == "x86_64-linux") {
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if (personality(0x0008 | 0x8000000 /* == PER_LINUX32_3GB */) == -1)
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throw SysError("cannot set i686-linux personality");
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}
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/* Impersonate a Linux 2.6 machine to get some determinism
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in builds that depend on the kernel version. */
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if ((drv.platform == "i686-linux" || drv.platform == "x86_64-linux") &&
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queryBoolSetting("build-impersonate-linux-26", true))
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{
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int cur = personality(0xffffffff);
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if (cur != -1) personality(cur | 0x0020000 /* == UNAME26 */);
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}
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#endif
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/* Fill in the environment. */
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