target and host and build

桃扇骨 2022-05-27 11:25 147阅读 0赞

Ever wondered what specifying build, host and target is all about? In my adventures of creating a compiler for compiling w32 binaries under Linux I ran across these notes which sum up the question better than any other explanation I've seen, so I thought I'd pass them along:  
  
some remarks on specifying --host=<host>, --target=<target> and --build=<build  
\# kindly provided by Keith Marshall:  
\# 1) build  
\# this is \*always\* the platform on which you are running the build  
\# process; since we are building on Linux, this is unequivocally going to  
\# specify \`linux', with the canonical form being \`i686-pc-linux-gnu'.  
\#  
\# 2) host  
\# this is a tricky one: it specifies the platform on which whatever we  
\# are building is going to be run; for the cross-compiler itself, that's  
\# also \`i686-pc-linux-gnu', but when we get to the stage of building the  
\# runtime support libraries to go with that cross-compiler, they must  
\# contain code which will run on the \`i686-pc-mingw32' host, so the \`host'  
\# specification should change to this, for the \`runtime' and \`w32api'  
\# stages of the build.  
\#  
\# 3) target  
\# this is probably the one which causes the most confusion; it is only  
\# relevant when building a cross-compiler, and it specifies where the code  
\# which is built by that cross-compiler itself will ultimately run; it  
\# should not need to be specified at all, for the \`runtime' or \`w32api',  
\# since these are already targetted to \`i686-pc-mingw32' by a correct  
\# \`host' specification.

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