improve cross-compile instructions and makefile support #849
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| The configure arguments that are needed to cross compile will vary | ||
| with the host and target machines. On a machine where ta6osx is the | ||
| native machine type, for example, cross compiling for tarm64osx may be | ||
| as simple as specifying an `-arch` flag for the C compiler: | ||
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| ./configure --cross -m=tarm64osx CFLAGS="-arch arm64" CC_FOR_BUILD=cc |
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How in this invocation can I specify that ta6osx is the native machine type? Your autodetection is wrong in some cases so I need to specify it.
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That would fall into the "If more configuration is needed" case described in the next paragraph. In retrospect, though, that approach is somewhat buried in the explanation, so I'll try revising.
I experimented with ways of passing flags through for the host build, so that you'd be able to specify the host machine type or other configuration options. But they didn't turn out any better than directly using configure to build for the host platform (before configure for the target platform).
Can you say more about when autodetection goes wrong?
Add a `--cross` argument to `configure` to indicate that the generated makefile's `make` should be like `make kernel`, and a pb-based bootstrap should rerun `configure` to build for the host machine instead of the specified target machine. Also, add support for `DESTDIR` as a more conventional alternative to the `--temproot` configure flag. While we're at it, recognize `CFLAGS_FOR_BUILD` for building `bin/zuo`. As part of the change to `configure`, having `CC_FOR_BUILD` set does not by itself disable the use of pb for creating or updating boot files. Depending on how boot files are obtained, `--force` now may be needed when using `CC_FOR_BUILD` as part of a cross compile that doesn't use `--cross`.
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I think this change is uncontroversial, especially since it only adjusts prose and build scripts. So, unless there are objections, I'm planning to merge. |
Add a
--crossargument toconfigureto indicate that the generated makefile'smakeshould be likemake kernel, and a pb-based bootstrap should rerunconfigureto build for the host machine instead of the specified target machine.Also, add support for
DESTDIRas a more conventional alternative to the--temprootconfigure flag. While we're at it, recognizeCFLAGS_FOR_BUILDfor buildingbin/zuo.As part of the change to
configure, havingCC_FOR_BUILDset does not by itself disable the use of pb for creating or updating boot files. Depending on how boot files are obtained,--forcenow may be needed when usingCC_FOR_BUILDas part of a cross compile that doesn't use--cross.Relevant to #847 and #848