https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91879
--- Comment #12 from Stas Sergeev <stsp at users dot sourceforge.net> ---
(In reply to jos...@codesourcery.com from comment #11)
> Those -isystem paths are the *non-sysroot* kind of paths for headers for a
> cross compiler.
Unfortunately I wasn't able to fully understand the
idea you explain. You mention "sysroot" and "non-sysroot"
builds, and you suggest to use --with-build-sysroot=
together with --with-sysroot= (without providing an example
of how to set --with-build-sysroot=, so I assume it should
be equal to $DESTDIR). May I assume that in the "sysroot"
build all the -isystem pathes will be changed the way the
sysroot prefix is replaced with build-sysroot prefix during
libs build?
OTOH I found a very simple way of implementing the Andrew Pinski
suggestion. Here it is:
-------
--- configure.ac.old 2019-09-25 17:00:34.973324924 +0300
+++ configure.ac 2019-09-25 17:45:33.958152993 +0300
@@ -2327,6 +2327,7 @@
[use sysroot as the system root during the build])],
[if test x"$withval" != x ; then
SYSROOT_CFLAGS_FOR_TARGET="--sysroot=$withval"
+ build_sysroot_path=${withval}
fi],
[SYSROOT_CFLAGS_FOR_TARGET=])
AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)
@@ -2573,7 +2574,7 @@
# Some systems (e.g., one of the i386-aix systems the gas testers are
# using) don't handle "\$" correctly, so don't use it here.
tooldir='${exec_prefix}'/${target_noncanonical}
-build_tooldir=${tooldir}
+build_tooldir=${build_sysroot_path}${tooldir}
# Create a .gdbinit file which runs the one in srcdir
# and tells GDB to look there for source files.
------
What do you think guys? Does it break something?
It definitely works for me.
