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Michael Brown e8393c3728 [build] Work around distros that use -fcf-protection=full by default 
Some patched versions of gcc (observed with gcc 9.3.0 on Ubuntu 20.04)
enable -fcf-protection=full by default.  This breaks code that is not
explicitly written to expect the use of this flag.  The breakage
occurs only at runtime if the affected code (such as setjmp()) happens
to execute, and is therefore a particularly pernicious class of bug to
be introduced into working code by a broken compiler.

Work around these broken patched versions of gcc by detecting support
for -fcf-protection and explicitly setting -fcf-protection=none if
found.

If any Ubuntu maintainers are listening: PLEASE STOP DOING THIS.  It's
extremely unhelpful to have to keep working around breakages that you
introduce by modifying the compiler's default behaviour.  Do what Red
Hat does instead: set your preferred CFLAGS within the package build
system rather than by patching the compiler to behave in violation of
its own documentation.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2021-02-04 11:24:05 +00:00
contrib [contrib] Update bochsrc.txt to work with current versions 2021-02-02 00:01:41 +00:00
src [build] Work around distros that use -fcf-protection=full by default 2021-02-04 11:24:05 +00:00
.travis.yml [travis] Update to current default build environment 2021-01-24 12:50:50 +00:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org