On 11/24/25 1:56 AM, Kito Cheng wrote:
This fixes a permission error that occurs when cross-compiling with
-save-temps and a relocated toolchain, where the original build path
exists but is inaccessible.
The issue occurs when:
- Building the toolchain at /home/scratch/build/
- Installing it to another location like /home/user/rv64-toolchain/
- The /home/scratch directory exists but has insufficient permissions
(e.g. drwx------ for /home/scratch/)
Without this fix, cc1 would report errors like:
cc1: error: /home/scratch/build/install/riscv64-unknown-elf/usr/local/include:
Permission denied
This occurred because the GCC driver did not pass GCC_EXEC_PREFIX and
isysroot to cc1/cc1plus in the compile stage when using -save-temps.
This caused cc1/cc1plus to search for headers from the wrong (original
build) path instead of the relocated installation path.
The fix ensures cc1/cc1plus won't try to collect include paths when
-fpreprocessed is specified. This prevents the permission error during
cross-compilation with -save-temps, as the preprocessed file already
contains all necessary headers.
gcc/c-family/ChangeLog:
* c-opts.cc (c_common_post_options): Skip register_include_chains
when cpp_opts->preprocessed is set.
OK.
jeff
