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.
This was referenced Jul 26, 2024
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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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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.