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Yann E. MORIN ae854d015e core: alternate solution to disable C++ 
Some packages that use libtool really need some love to be able to
disable C++ support.

This is because libtool will want to call AC_PROG_CXXCPP as soon as CXX
is set non-empty to something different from 'no'. Then, AC_PROG_CXXCPP
will want a C++ preprocessor that works on valid input *and* fail on
invalid input.

So, providing 'false' as the C++ compiler will then require that we do
have a working C++ preprocessor. Which is totally counter-productive
since we do not have a C++ compiler to start with...

bd39d11d2e (core/infra: fix build on toolchain without C++) was a
previous attempt at fixing this, by using the host's C++ preprocessor.

However, that is very incorrect (that's my code, I can say so!) because
the set of defines will most probably be different for the host and the
target, thus causing all sorts of trouble. For example, on ARM we'd have
to include different headers for soft-float vs hard-float, which is
decided based on a macro, which is not defined for x86, and thus may
redirect to the wrong (and missing) header.

Instead, we notice that libtool uses the magic value 'no' to decide that
a C++ compiler is not available, in which case it skips the call to
AC_PROG_CXXCPP.

Given that 'no' is not provided by any package in Debian and
derivatives, as well as in Fedora, we can assume that no system will
have an executable called 'no'. Hence, we use that as a magic value to
disable C++ detection altogether.

Fixes: #10846 (again)

Reported-by: Damien Riegel <damien.riegel@savoirfairelinux.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Damien Riegel <damien.riegel@savoirfairelinux.com>
Cc: Peter Seiderer <ps.report@gmx.net>
Cc: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Tested-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 4cd1ab1588)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2018-04-06 20:06:02 +02:00
arch arch: add Atom CPUs as Silvermont Architecture target 2018-01-01 13:05:16 +01:00
board configs/imxsabre: Fix U-Boot parallel build issue 2018-04-06 16:49:45 +02:00
boot uboot: fix build for older uboot source trees 2018-03-30 23:19:30 +02:00
configs board/technologic/ts5x00: rename to ts5500 2018-03-30 23:17:00 +02:00
docs docs/manual: pass PARALLEL_JOBS to NINJA_OPTS 2018-04-06 16:42:50 +02:00
fs fs/cpio/init: preserve arguments 2018-02-26 20:49:40 +01:00
linux linux: bump default to version 4.15.14 2018-04-06 20:03:35 +02:00
package core: alternate solution to disable C++ 2018-04-06 20:06:02 +02:00
support support/check-bin-arch: exclude kernel modules for merged /usr 2018-03-30 22:11:20 +02:00
system system: only expose getty options for busybox and sysvinit 2018-01-12 22:07:59 +01:00
toolchain toolchain: fix detection of SSP support 2018-04-06 19:55:25 +02:00
utils utils/scanpypi: fix 'downloas' typo in error message 2018-03-01 17:14:01 +01:00
.defconfig arch: remove support for sh64 2016-09-08 22:15:15 +02:00
.flake8 .flake8: add config file for Python code style 2017-10-06 19:05:18 +02:00
.gitignore
.gitlab-ci.yml board/technologic/ts5x00: rename to ts5500 2018-03-30 23:17:00 +02:00
.gitlab-ci.yml.in gitlab-ci: use new, tagged image 2018-02-05 22:38:30 +01:00
CHANGES Update for 2018.02 2018-03-04 22:28:34 +01:00
Config.in Config.in: Document BR2_CCACHE_DIR override 2018-04-06 20:01:36 +02:00
Config.in.legacy linux-headers: drop old unsupported 3.x versions 2018-02-04 00:02:35 +01:00
COPYING COPYING: add exception about patch licensing 2016-02-26 19:50:13 +01:00
DEVELOPERS docker-proxy: new package 2018-03-30 23:18:49 +02:00
Makefile Update for 2018.02 2018-03-04 22:28:34 +01:00
Makefile.legacy Remove BR2_DEPRECATED 2016-10-15 23:14:45 +02:00
README README: add reference to submitting-patches 2016-02-01 19:16:08 +01:00

README 

Buildroot is a simple, efficient and easy-to-use tool to generate embedded
Linux systems through cross-compilation.

The documentation can be found in docs/manual. You can generate a text
document with 'make manual-text' and read output/docs/manual/manual.text.
Online documentation can be found at http://buildroot.org/docs.html

To build and use the buildroot stuff, do the following:

1) run 'make menuconfig'
2) select the target architecture and the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) find the kernel, bootloader, root filesystem, etc. in output/images

You do not need to be root to build or run buildroot.  Have fun!

Buildroot comes with a basic configuration for a number of boards. Run
'make list-defconfigs' to view the list of provided configurations.

Please feed suggestions, bug reports, insults, and bribes back to the
buildroot mailing list: buildroot@buildroot.org
You can also find us on #buildroot on Freenode IRC.

If you would like to contribute patches, please read
https://buildroot.org/manual.html#submitting-patches