General question: If I use a cross compiler, how can I tell the value of the "--host" option I should give when I run configure?
Specific: I'm using cross compiler for arm64 arch. What is the correct "--host" value to use?
If I use a cross compiler, how can I tell the value of the
--host
option I should give when I run./configure
?
Three machines must be distinguished when discussing toolchain creation
Four common build types are possible for toolchains are:
Native build i.e. BUILD==HOST==TARGET
Used to build normal gcc for workstation. e.g. BUILD==HOST==TARGET==x86
Cross-build i.e. BUILD==HOST!=TARGET
Used to build toolchain that works on your workstation but generates binary for target. e.g. BUILD==HOST==x86 TARGET==arm
Cross-native build i.e. BUILD!=HOST==TARGET
Used to toolchain that works on your target and generates binary for target. e.g BUILD==x86 HOST==TARGET==ARM
Canadian toolchain i.e. BUILD!=HOST!=TARGET
Used to build ARCHITECTURE A a toolchain runs on B and generates binary for architecture C. e.g.BUILD==x86 HOST==mac TARGET==arm
With armed this basics coming to your question.
For any software, first run ./configure --help
Host type:
--build=BUILD configure for building on BUILD [BUILD=HOST]
--host=HOST configure for HOST [guessed]
--target=TARGET configure for TARGET [TARGET=HOST]
You will find above so depending on what you want to do, you need to set it for cross compiling. If all options are available, then you want to execute on arm target then set --host={your toolchain triplet} --target={your toolchain triplet}
.
For example, if you are using arm-none-linux-gnueabi-gcc
, set --host=arm-none-linux-gnueabi --target=arm-none-linux-gnueabi
. This will write to your makefile.
Finally, generated executable will run on target. For --build
this will be automatically set, no need to worry.
For some software package only two option available i.e host and build
. here if set host
is enough to cross-compile
Specific: I'm using cross compiler for
arm64
arch. What is the correct--host
value to use?
For x86_64, --host={triplet}
is generally given, so I think the same should work for arm64 by setting --host={triplet}
for your toolchain, but I'm not sure.