Add support for modular build structure. #264
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This implements the required asm functions for sparc64_sysv_elf and was tested on an OpenBSD/sparc64 system. Jump_fcontext uses an extra C call frame to store the frame-pointer and return address. Because of this the code is simply a save (to new reg window), then forcing a window flush and finally switch stack and restore from there. Since jump_fcontext() uses a register window and stack frame, make_fcontext() reserves two call frames on the stack (one for jump_fcontext() and the other for the callback function). OpenBSD/sparc64 uses stackghost which prevents userland from overriding the return-address on the stack. Because of this make_fcontext() uses an extra trampoline to implement the _exit(0) call if the callback returns. All tests pass with this on OpenBSD/sparc64 (also the tests for fiber, coroutine and coroutine2).
Without this test_fcontext.cpp fails on OpenBSD with a not-on-stack OS error.
…a source in install targets.
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Please review and merge this PR at your earliest convenience. |
Sorry - some checks are faling (11 failing and 12 successful checks) |
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The failures look unrelated to my changes. Especially since the checkout itself is failing. |
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Since 463cffe CI builds are broken on some platforms! |
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The use of context/build/architecture.jam Line 68 in d11cbcc Predef probably needs to be fixed. There are three additional failures in multi.yml, but I don't know what they are caused by. Maybe @Kojoley, who wrote multi.yml, would be able to say. |
I'm sorry, I have no idea. Predef could be absolutely in the wrongs, like in this case boostorg/predef#127. But the fundamentals of this project build script is a primary issue and I had too many attempts at improving the situation. |
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Did those CI jobs work when you originally wrote multi.yml? We need to figure out what broke them. |
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boostorg/predef#135 seems like a likely cause, too. |
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OK, the answer is yes, they did work before this PR was merged: https://github.com/boostorg/context/actions/runs/10594678160 |
This is part of the effort to make the Boost libraries "modular" for build and consumption. See https://lists.boost.org/Archives/boost/2024/01/255704.php and https://github.com/grafikrobot/boost-b2-modular/blob/b2-modular/README.adoc for more information.
This PR depends on the following other PRs being merged to both develop and master branches of the respective repos:
This PR will be changed to ready for review, i.e. not draft, when the above are merged. Do not merge this one until that time.