OpenWRT Cross Compiling
- CentOS 7.8, OpenWRT 19.07.3, Perl 5.28.1
- ...a working CentOS system.
- yum install binutils bzip2 gcc gcc-c++ gawk gettext flex ncurses-devel zlib-devel zlib-static make patch unzip openssl-devel perl-ExtUtils-MakeMaker glibc glibc-devel glibc-static ncurses-libs sed sdcc intltool sharutils bison wget git-core xz
- OpenWRT, browse GIT Repository: https://git.openwrt.org/
- git clone -b openwrt-19.07 https://github.com/openwrt/openwrt.git (this should download just the 19.07.01, .03, .04, etc branch)
- Directory: The default for most of the items below is the users "home" directory ( ~ )
- Perlbrew for matching the exact version of Perl on the router and controlling it easily: https://perlbrew.pl/
- Nice tutorial for Perlbrew basics: https://www.digitalocean.com/community/tutorials/how-to-install-perlbrew-and-manage-multiple-versions-of-perl-5-on-centos-7
- perlbrew list
- perlbrew list-modules
- perlbrew use NameOfVersion
- perl -v: Verify current version used
- Install a Perl Module: curl -L https://cpanmin.us | perl - Name::Name
- Download pre-requisites for a Cross Compile Build system: https://openwrt.org/docs/guide-developer/build-system/install-buildsystem
- EPEL repository needed for some: yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
- yum install binutils bzip2 gcc gcc-c++ gawk gettext flex ncurses-devel zlib-devel zlib-static make patch unzip perl-ExtUtils-MakeMaker glibc glibc-devel glibc-static ncurses-libs sed sdcc intltool sharutils bison wget git-core openssl-devel xz
- And of course some of the above (zlib-static, glibc-static, sdcc, shareutils) doesn't work and is also a bit ambivalent, so;
- yum install zlib glibc-common glibc-devel glibc-headers glibc-langpack-en (sdcc (compiler for 8501 microcontroller) and shareutils (for specific encoding for paid RedHat subscribers) are not readily available for CentOS 8)
- And of course some of the above (zlib-static, glibc-static, sdcc, shareutils) doesn't work and is also a bit ambivalent, so;
- If one wants to build firmware version of OpenWRT: Download OpenWRT Files (from https://openwrt.org/docs/guide-developer/build-system/install-buildsystem)
- git clone https://git.openwrt.org/openwrt/openwrt.git
- If one wants to build Perl and compile modules that include other libraries such as OpenSSL
- yum install openssl-devel
- Download the TAR package from CPAN
- perl Makefile.PL
- make
- make test
- make dist
- OpenSSL Cross Compiling (make sure the appropriate version of Perl is selected via perlbrew, above)
- Links;
- https://stackoverflow.com/questions/15539062/cross-compiling-of-openssl-for-linux-arm-v5te-linux-gnueabi-toolchain
- https://wiki.openssl.org/index.php/Compilation_and_Installation
- For ARM infor and --prefix and --openssldir info: https://stackoverflow.com/questions/15539062/cross-compiling-of-openssl-for-linux-arm-v5te-linux-gnueabi-toolchain
- https://centos.pkgs.org/7/epel-x86_64/binutils-arm-linux-gnu-2.27-9.el7.1.x86_64.rpm.html
- https://pkgs.org/search/?q=binutils-arm-linux-gnu
- wget OpenSSL URL ( https://www.openssl.org/source/ )
- ./Configure LIST ( linux-armv4 )
- ./Configure linux-armv4 ( ./config is equivalent to ./Configure x86_64 )
- --prefix=/WhatEverPathForCompiledFiles/
- --openssldir=/usr/ (that's where OpenWRT puts openssl, /usr/bin/ )
- make
- make depend
- make dist, err, make tar (for OpenSSL, but it doesn't work of course);
- Key piece of information for doing it manually: https://stackoverflow.com/questions/1506462/what-files-did-make-install-copy-and-where and https://stackoverflow.com/questions/11307465/destdir-and-prefix-of-make
- make install DESTDIR=
- Header files should be in /usr/include
- Links;
- Compiling
- file NameOfBinary: Shows information about binary file (opkg install file)
- Shared VS Non-Shared, Static VS Shared, .a VS .so ( using the shared switch, as in ./Configure XYZ shared
- Static: EVERYTHING in a single binary / executable file
- Shared: Dependencies located in other files
...quitting for now because the instructions at https://openwrt.org/docs/guide-developer/build-system/use-buildsystem#selecting_a_specific_major_revision are a pathetic joke. Go ahead, try them, see if it works. Nope....
Additional notes from other failed attempts;
http://transit.iut2.upmf-grenoble.fr/cgi-bin/man/man2html?Crypt::SSLeay+3
https://github.com/Entware/Entware-ng/wiki/Using-gcc-%28native-compilation%29
perl Makefile.PL --incpath /usr/src/lib
perl Makefile.PL -- $openssl_path=/usr/src/lib/openssl
echo | gcc -v -E -
perl -V
/usr/src/net/Net_SSLeay.pm-1.23/MYMETA.yml
env
opkg install perl-dev
opkg install openssl-
https://github.com/Entware/Entware-ng/wiki/Self-installation-of-perl-modules
https://github.com/Entware/Entware-ng/issues/430
https://github.com/Entware/Entware/wiki/Using-GCC-for-native-compilation
/usr/bin/ld: cannot find -lssl
/usr/bin/ld: cannot find -lcrypto
/usr/bin/ld: cannot find -ldl
ln -s
ld -lcrypto --verbose
find /
https://stackoverflow.com/questions/16710047/usr-bin-ld-cannot-find-lnameofthelibrary
For the /usr/bin/ld Issue: https://stackoverflow.com/questions/16710047/usr-bin-ld-cannot-find-lnameofthelibrary
/usr/bin/opensslOpenSSL 1.1.1g 21 Apr 2020
built on: Thu Jul 30 19:43:27 2020 UTC
platform: linux-arm-openwrt
options: bn(64,32) rc4(char) des(long) blowfish(ptr)
compiler: arm-openwrt-linux-muslgnueabi-gcc -fPIC -pthread -Wa,--noexecstack -Wall -O3 -Os -pipe -fno-caller-saves -fno-plt -fhonour-copts -Wno-error=unused-but-set-variable -Wno-error=unused-result -mfloat-abi=hard -Wformat -Werror=format-security -fstack-protector -D_FORTIFY_SOURCE=1 -Wl,-z,now -Wl,-z,relro -fpic -ffunction-sections -fdata-sections -znow -zrelro -DOPENSSL_USE_NODELETE -DOPENSSL_PIC -DOPENSSL_CPUID_OBJ -DOPENSSL_BN_ASM_MONT -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM -DSHA512_ASM -DKECCAK1600_ASM -DAES_ASM -DBSAES_ASM -DGHASH_ASM -DECP_NISTZ256_ASM -DPOLY1305_ASM -DNDEBUG -DOPENSSL_PREFER_CHACHA_OVER_GCM -DOPENSSL_SMALL_FOOTPRINT
OPENSSLDIR: "/etc/ssl"
ENGINESDIR: "/usr/lib/engines-1.1"
Seeding source: os-specific
OpenSSL>version -a
https://www.cpan.org/modules/by-module/Net/Net-SSLeay-1.73.readme
https://stackoverflow.com/questions/60521205/how-can-i-install-netssleay-with-perlbrew-in-macos-catalina
perl Makefile.PL -- INC=-I/usr/src/lib/ -- OPENSSL_PREFIX=/usr/src/openssl_compiled/usr/local
SSLeay.c: In function 'XS_Net__SSLeay_CTX_sessions':
SSLeay.c:3608:2: error: unknown type name 'LHASH'; did you mean '_LHASH'?
LHASH * RETVAL;
^~~~~
SSLeay.c line 3608, change LHASH to _LHASH
OpenSSL
remove -ldl and all -pthread references near EX_LIBS (from https://github.com/openssl/openssl/issues/3106)
Change destination directory for GCC Make: https://stackoverflow.com/questions/3239343/make-install-but-not-to-default-directories
...sure enough, in Makefile;
# DESTDIR is for package builders so that they can configure for, say,
# /usr/ and yet have everything installed to /tmp/somedir/usr/.
# Normally it is left empty.
DESTDIR=
Add the paths in Make File that include the new SSL stuff
DDLFLAGS = -shared -L/usr/src/openssl_compiled/usr/local/ -L/usr/src/openssl_compiled/usr/local/lib -L/usr -L/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/target-arm_cortex-a9+vfpv3-d16_musl_eabi/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/target-arm_cortex-a9+vfpv3-d16_musl_eabi/lib -L/builder/shared-workdir/build/sdk/staging_dir/toolchain-arm_cortex-a9+vfpv3-d16_gcc-7.5.0_musl_eabi/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/toolchain-arm_cortex-a9+vfpv3-d16_gcc-7.5.0_musl_eabi/lib -znow -zrelro
LDFLAGS = -L/usr/src/openssl_compiled/usr/local/ -L/usr/src/openssl_compiled/usr/local/lib -L/usr -L/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/target-arm_cortex-a9+vfpv3-d16_musl_eabi/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/target-arm_cortex-a9+vfpv3-d16_musl_eabi/lib -L/builder/shared-workdir/build/sdk/staging_dir/toolchain-arm_cortex-a9+vfpv3-d16_gcc-7.5.0_musl_eabi/usr/lib -L/builder/shared-workdir/build/sdk/staging_dir/toolchain-arm_cortex-a9+vfpv3-d16_gcc-7.5.0_musl_eabi/lib -znow -zrelro