OpenWRT firmware for routers
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Konstantin Demin 9c3bfd0906 dropbear: fix hardening flags during configure
compiler complains about messed up CFLAGS in build log:
  <command-line>: warning: "_FORTIFY_SOURCE" redefined
  <command-line>: note: this is the location of the previous definition

and then linker fails:
  mips-openwrt-linux-musl-gcc [...] -o dropbearmulti [...]
  collect2: fatal error: ld terminated with signal 11 [Segmentation fault]
  compilation terminated.
  /staging_dir/toolchain-mips_24kc_gcc-8.2.0_musl/mips-openwrt-linux-musl/bin/ld: /tmp/cc27zORz.ltrans0.ltrans.o: relocation R_MIPS_HI16 against `cipher_descriptor' can not be used when making a shared object; recompile with -fPIC
  /staging_dir/toolchain-mips_24kc_gcc-8.2.0_musl/mips-openwrt-linux-musl/bin/ld: /tmp/cc27zORz.ltrans1.ltrans.o: relocation R_MIPS_HI16 against `ses' can not be used when making a shared object; recompile with -fPIC
  /staging_dir/toolchain-mips_24kc_gcc-8.2.0_musl/mips-openwrt-linux-musl/bin/ld: /tmp/cc27zORz.ltrans2.ltrans.o: relocation R_MIPS_HI16 against `cipher_descriptor' can not be used when making a shared object; recompile with -fPIC
  /staging_dir/toolchain-mips_24kc_gcc-8.2.0_musl/mips-openwrt-linux-musl/bin/ld: BFD (GNU Binutils) 2.31.1 assertion fail elfxx-mips.c:6550
  [...]
  /staging_dir/toolchain-mips_24kc_gcc-8.2.0_musl/mips-openwrt-linux-musl/bin/ld: BFD (GNU Binutils) 2.31.1 assertion fail elfxx-mips.c:6550
  make[3]: *** [Makefile:198: dropbearmulti] Error 1
  make[3]: *** Deleting file 'dropbearmulti'
  make[3]: Leaving directory '/build_dir/target-mips_24kc_musl/dropbear-2018.76'
  make[2]: *** [Makefile:158: /build_dir/target-mips_24kc_musl/dropbear-2018.76/.built] Error 2
  make[2]: Leaving directory '/package/network/services/dropbear'

This FTBFS issue was caused by hardening flags set up by dropbear's configure script.

By default, Dropbear offers hardening via CFLAGS and LDFLAGS,
but this may break or confuse OpenWrt settings.

Remove most Dropbear's hardening settings in favour of precise build,
but preserve Spectre v2 mitigations:
* -mfunction-return=thunk
* -mindirect-branch=thunk

Signed-off-by: Konstantin Demin <rockdrilla@gmail.com>
5 years ago
.github build: Update README & github help 6 years ago
config build: remove leftovers from previous x86 commits 5 years ago
include toolchain: ARM: Fix toolchain compilation for gcc 8.x 5 years ago
package dropbear: fix hardening flags during configure 5 years ago
scripts IB: include SUPPORTED_DEVICES in 'make info' output 5 years ago
target gemini: Classify Raidsonic NAS IB-4220-B as a NAS 5 years ago
toolchain toolchain: ARM: Fix option conflict with multiarch 5 years ago
tools tools/ccache: update to 3.6 5 years ago
.gitattributes add .gitattributes to prevent the git autocrlf option from messing with CRLF/LF in files 12 years ago
.gitignore .gitignore: add .project & .cproject for eclipse users 6 years ago
BSDmakefile add missing copyright header 18 years ago
Config.in merge: base: update base-files and basic config 7 years ago
LICENSE finally move buildroot-ng to trunk 8 years ago
Makefile build: Unset CDPATH to avoid problems 6 years ago
README build: README punctuation pendantry 6 years ago
feeds.conf.default feeds: switch git.lede-project.org URLs to git.openwrt.org 6 years ago
rules.mk librpc: remove package 5 years ago

README

  _______                     ________        __
 |       |.-----.-----.-----.|  |  |  |.----.|  |_
 |   -   ||  _  |  -__|     ||  |  |  ||   _||   _|
 |_______||   __|_____|__|__||________||__|  |____|
          |__| W I R E L E S S   F R E E D O M
 -----------------------------------------------------

This is the buildsystem for the OpenWrt Linux distribution.

To build your own firmware you need a Linux, BSD or MacOSX system (case
sensitive filesystem required). Cygwin is unsupported because of the lack
of a case sensitive file system.

You need gcc, binutils, bzip2, flex, python, perl, make, find, grep, diff,
unzip, gawk, getopt, subversion, libz-dev and libc headers installed.

1. Run "./scripts/feeds update -a" to obtain all the latest package definitions
defined in feeds.conf / feeds.conf.default

2. Run "./scripts/feeds install -a" to install symlinks for all obtained
packages into package/feeds/

3. Run "make menuconfig" to select your preferred configuration for the
toolchain, target system & firmware packages.

4. Run "make" to build your firmware. This will download all sources, build
the cross-compile toolchain and then cross-compile the Linux kernel & all
chosen applications for your target system.

Sunshine!
	Your OpenWrt Community
	http://www.openwrt.org