https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81878
--- Comment #40 from Tamar Christina <tnfchris at gcc dot gnu.org> --- > In most practical cases -B../../ is just redundant with $(CXX). It's only > when you configure like Richard that you may run into issues, but then we can > assume that we're on Linux so the paths are OK I think. Ah ok, I'll update to trunk and run a bootstrap today then and submit a patch tomorrow. Thanks! --- Comment #41 from Tamar Christina <tnfchris at gcc dot gnu.org> --- Author: tnfchris Date: Mon Oct 29 09:45:50 2018 New Revision: 265583 URL: https://gcc.gnu.org/viewcvs?rev=265583&root=gcc&view=rev Log: Fix mingw-w64 Ada native bootstrap (PR81878). Due to the changes in PR81878 builds of GCC8 and trunk are impossible with Ada enabled[1][2]. The reason the patch breaks the bootstrap is due to how gnatlink receives it's arguments. gnatlink is usually invoked as $(GNATLINK) -v gnatcmd -o ../../gnat$(exeext) \ --GCC="$(CC) $(ADA_INCLUDES)" --LINK="$(GCC_LINK)" $(TOOLS_LIBS) so it passes $(CC) and $(GCC_LINK) as quoted arguments to the program. Because of this quotation the msys2 shell does not translate any paths in $(CC) and $(GCC_LINK) from their Unix version to their Windows version. Furthermore because there are multiple paths in the values separated by space and because the paths often contain a prefix like -L (e.g. -L/f/foo) we can't use `fix_srcfile_path` to fix this. An alternative solution would have been to create a stub program that echos the commandline options it receives back, and calling this program with $(CC) and $(GCC_LINK) unquoted to get them translated. However this was a bit more invasive. So instead for native compilations we add -B../../ such that it picks up the lto plugin from the previous built compiler. Since it's native there shouldn't be a mismatch here. [1] https://github.com/Alexpux/MINGW-packages/pull/3877#issuecomment-408651809 [2] https://gcc.gnu.org/ml/gcc/2018-07/msg00410.html gnattools/ChangeLog: PR ada/81878 * Makefile.in (TOOLS_FLAGS_TO_PASS_NATIVE): Add -B ../../. Modified: trunk/gnattools/ChangeLog trunk/gnattools/Makefile.in
