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48 lines
2.1 KiB
48 lines
2.1 KiB
From 94fb38fbb77e664e4f41343257a26ae5bab40d1d Mon Sep 17 00:00:00 2001
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From: Willy Tarreau <w@1wt.eu>
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Date: Thu, 10 Jul 2014 20:24:25 +0200
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Subject: [PATCH 25/25] DOC: remove references to CPU=native in the README
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Certain compilers running in virtualized environments may produce code
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that the same processor cannot execute with -march=native, either because
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of hypervisor bugs reporting wrong CPU features, or because of compiler
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bugs forgetting to check CPU features. So better stop recommending this
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combination so that users don't get trapped anymore.
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(cherry picked from commit 817dad50b02d1a82d495dfea4eab9e3a91127391)
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---
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README | 9 +++++----
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1 file changed, 5 insertions(+), 4 deletions(-)
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diff --git a/README b/README
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index 0ef0179..e2b8570 100644
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--- a/README
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+++ b/README
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@@ -53,8 +53,9 @@ one of the following choices to the CPU variable :
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- i686 for intel PentiumPro, Pentium 2 and above, AMD Athlon
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- i586 for intel Pentium, AMD K6, VIA C3.
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- ultrasparc : Sun UltraSparc I/II/III/IV processor
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- - native : use the build machine's specific processor optimizations
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- - generic : any other processor or no specific optimization. (default)
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+ - native : use the build machine's specific processor optimizations. Use with
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+ extreme care, and never in virtualized environments (known to break).
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+ - generic : any other processor or no CPU-specific optimization. (default)
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Alternatively, you may just set the CPU_CFLAGS value to the optimal GCC options
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for your platform.
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@@ -132,11 +133,11 @@ And I build it this way on OpenBSD or FreeBSD :
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And on a classic Linux with SSL and ZLIB support (eg: Red Hat 5.x) :
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- $ make TARGET=linux26 CPU=native USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1
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+ $ make TARGET=linux26 USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1
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And on a recent Linux >= 2.6.28 with SSL and ZLIB support :
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- $ make TARGET=linux2628 CPU=native USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1
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+ $ make TARGET=linux2628 USE_PCRE=1 USE_OPENSSL=1 USE_ZLIB=1
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In order to build a 32-bit binary on an x86_64 Linux system with SSL support
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without support for compression but when OpenSSL requires ZLIB anyway :
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--
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1.8.5.5
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