Commit 132699b95d3ee4d889ea2a80540acf3300987dad
2021-06-27T16:50:20
configure.ac: add --disable-exec-static-tramp flag (#647) Some projects like GHC (Glasgow Haskell Compiler) and gobject-introspection use `ffi_closure_alloc()` as a way to allocate executable memory. exec static tramp interferes with it (unclear how exactly yet). GHC symptom: ffi closure freeing cimplains about unexpected trampoline (GHC manually fills one): ``` $ ghci GHCi, version 8.10.5: https://www.haskell.org/ghc/ :? for help ghc: freeHaskellFunctionPtr: not for me, guv! 0x7f0417a1efe8 ghc: freeHaskellFunctionPtr: not for me, guv! 0x7f0417a1efc8 ``` gobject-introspection symptom: ``` $ meld Segmentation fault (core dumped) $ gdb --args /usr/bin/python3.9 /usr/bin/meld (gdb) run ... Thread 1 "python3.9" received signal SIGSEGV, Segmentation fault. 0x00007fffe9ac1ae8 in g_callable_info_free_closure ( callable_info=0x555555d45990, closure=0x7fffe9e70c20) at ../gobject-introspection-1.68.0/girepository/girffi.c:428 428 g_free (wrapper->ffi_closure.cif->arg_types); (gdb) bt callable_info=0x555555d45990, closure=0x7fffe9e70c20) at ../gobject-introspection-1.68.0/girepository/girffi.c:428 data=0x555555d252d0) at ../pygobject-3.40.1/gi/pygi-closure.c:635 ... ``` To ease downstreams narrowing down the actual problem let's provide a knob to disable exec static trampolines. The change for not affect current default. Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>