liblzma: Remove ifunc support.

This is *NOT* done for security reasons even though the backdoor
relied on the ifunc code. Instead, the reason is that in this
project ifunc provides little benefits but it's quite a bit of
extra code to support it. The only case where ifunc *might* matter
for performance is if the CRC functions are used directly by an
application. In normal compression use it's completely irrelevant.

1 files changed, 0 insertions, 8 deletions

diff --git a/INSTALL b/INSTALL
index 6a990ef2..ad924fe5 100644
--- a/INSTALL
+++ b/INSTALL
@@ -518,14 +518,6 @@ XZ Utils Installation
                                 calls any liblzma functions from more than
                                 one thread, something bad may happen.
 
-    --enable-ifunc
-                Use __attribute__((__ifunc__())) in liblzma. This is
-                enabled by default on GNU/Linux and FreeBSD.
-
-                The ifunc attribute is incompatible with
-                -fsanitize=address. --disable-ifunc must be used
-                if any -fsanitize= option is specified in CFLAGS.
-
     --enable-sandbox=METHOD
                 There is limited sandboxing support in the xz and xzdec
                 tools. If built with sandbox support, xz uses it