https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125337
Bug ID: 125337
Summary: Inconsistent search path for header files and header
unit cmi-files
Product: gcc
Version: 16.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: preprocessor
Assignee: unassigned at gcc dot gnu.org
Reporter: joergboe at snafu dot de
Target Milestone: ---
gcc fails to import a user header unit from different source file locations.
The following files exist:
header.hpp:
/* empty */
main.cpp
import "header.hpp";
int main() {}
src/src1.cpp
import "../header.hpp";
The following steps are executed:
> g++-16 -x c++-user-header header.hpp -c -std=c++20 -fmodules
> -flang-info-module-cmi
./header.hpp: note: writing CMI ‘gcm.cache/,/header.hpp.gcm’
> g++-16 main.cpp -c -std=c++20 -fmodules -flang-info-module-cmi
In module imported at main.cpp:1:1:
./header.hpp: note: reading CMI ‘gcm.cache/,/header.hpp.gcm’
g++-16 src/src1.cpp -c -std=c++20 -fmodules -flang-info-module-cmi
In module imported at src/src1.cpp:1:1:
./src/../header.hpp: note: reading CMI ‘gcm.cache/,/src/,,/header.hpp.gcm’
./src/../header.hpp: error: failed to read compiled module: No such file or
directory
./src/../header.hpp: note: compiled module file is
‘gcm.cache/,/src/,,/header.hpp.gcm’
./src/../header.hpp: note: imports must be built before being imported
./src/../header.hpp: fatal error: returning to the gate for a mechanical issue
compilation terminated.
When I change src/src1.cpp to
import "header.hpp";
The translation of src/src1.cpp fails too:
> g++-16 src/src1.cpp -c -std=c++20 -fmodules -flang-info-module-cmi
src/src1.cpp:1:8: fatal error: header.hpp: No such file or directory
1 | import "header.hpp";
| ^~~~~~~~~~~~
compilation terminated.
I expect the search for CMI files and the search for header files to behave
analogously.
