On 10/27/2021 2:05 PM, Richard Purdie via Gcc-patches wrote:
OpenEmbedded/Yocto Project extensively uses the --sysroot support within gcc.
We discovered that when compiling preprocessed source (.i or .ii files), the
compiler will try and access the builtin sysroot location rather than the
--sysroot option specified on the commandline. If access to that directory is
permission denied (unreadable), gcc will error. This is particularly problematic
when ccache is involved.
This patch adds %I to the cpp-output spec macro so the default substitutions for
-iprefix, -isystem, -isysroot happen and the correct sysroot is used.
2021-10-27 Richard Purdie <richard.pur...@linuxfoundation.org>
gcc/cp/ChangeLog:
* lang-specs.h: Pass sysroot options to cpp for preprocessed source
gcc/ChangeLog:
* gcc.c: Pass sysroot options to cpp for preprocessed source
So generally OK, though I think this is incomplete. If I understand the
underlying bits correctly a similar change is needed in:
{lto,objc,fortran,ada/gcc-interface,objcp}/lang-specs.h.
I think d/lang-specs.h is OK, though it'd probably be useful to double
check that.
jeff
