48f182ece0
This commit fixes bug #7250, by allowing more libstdc++ features to be enabled with uClibc. libstdc++ wants an absolutely complete C99 support in the C library before enabling *any* feature that needs some C99 functions. However, uClibc doesn't provide C99 complex numbers, so libstdc++ disables a lot of C++ standard methods, even though they are not related to C99 complex numbers. A partial solution already existed in the patch 302-c99-snprintf.patch, but this commit replaces it by the more complete 850-libstdcxx-uclibc-c99.patch, which is highly inspired by https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58393, except that it doesn't rely on configure.ac checks, but simply on testing defined(__UCLIBC__) like was done in 302-c99-snprintf.patch. This allows to avoid having to autoreconf gcc, which is quite complicated to achieve. Reported-by: Richard <tarka.t.otter@gmail.com> Cc: Richard <tarka.t.otter@gmail.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
To build and use the buildroot stuff, do the following:
1) run 'make menuconfig'
2) select the packages you wish to compile
3) run 'make'
4) wait while it compiles
5) Use your shiny new root filesystem. Depending on which sort of
root filesystem you selected, you may want to loop mount it,
chroot into it, nfs mount it on your target device, burn it
to flash, or whatever is appropriate for your target system.
You do not need to be root to build or run buildroot. Have fun!
Offline build:
==============
In order to do an offline-build (not connected to the net), fetch all
selected source by issuing a
$ make source
before you disconnect.
If your build-host is never connected, then you have to copy buildroot
and your toplevel .config to a machine that has an internet-connection
and issue "make source" there, then copy the content of your dl/ dir to
the build-host.
Building out-of-tree:
=====================
Buildroot supports building out of tree with a syntax similar
to the Linux kernel. To use it, add O=<directory> to the
make command line, E.G.:
$ make O=/tmp/build
And all the output files (including .config) will be located under /tmp/build.
More finegrained configuration:
===============================
You can specify a config-file for uClibc:
$ make UCLIBC_CONFIG_FILE=/my/uClibc.config
And you can specify a config-file for busybox:
$ make BUSYBOX_CONFIG_FILE=/my/busybox.config
To use a non-standard host-compiler (if you do not have 'gcc'),
make sure that the compiler is in your PATH and that the library paths are
setup properly, if your compiler is built dynamically:
$ make HOSTCC=gcc-4.3.orig HOSTCXX=gcc-4.3-mine
Depending on your configuration, there are some targets you can use to
use menuconfig of certain packages. This includes:
$ make HOSTCC=gcc-4.3 linux-menuconfig
$ make HOSTCC=gcc-4.3 uclibc-menuconfig
$ make HOSTCC=gcc-4.3 busybox-menuconfig
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