I also tried using gcc - I compiled the following revision
ommit 024f135a1e9b8f8e102960357cae6e99e1dbe6eb
Author: Ben Boeckel ben.boeckel@kitware.com
Date: Fri Sep 1 09:04:02 2023 -0400
p1689r5: initial support
This patch implements support for [P1689R5][] to communicate to a build
system the C++20 module dependencies to build systems so that they may
build `.gcm` files in the proper order.
Support is communicated through the following three new flags:
- `-fdeps-format=` specifies the format for the output. Currently named
`p1689r5`.
- `-fdeps-file=` specifies the path to the file to write the format to.
- `-fdeps-target=` specifies the `.o` that will be written for the TU
that is scanned. This is required so that the build system can
correlate the dependency output with the actual compilation that will
occur.
The error is now:
[build] /usr/local/bin/g++ -DENABLE_TESTS -I/home/pkoziol/repos/aoc22/src/…/include/aoc22 -isystem /home/pkoziol/repos/aoc22/tests/Catch2/src/catch2/… -isystem /home/pkoziol/repos/aoc22/builds/dev_ninja_gcc/tests/Catch2/generated-includes -g -std=c++20 -Wall -Wextra -Wpedantic -Werror -Wshadow -Wnon-virtual-dtor -Wold-style-cast -Wcast-align -Wunused -Woverloaded-virtual -Wconversion -Wsign-conversion -Wmisleading-indentation -Wnull-dereference -Wdouble-promotion -Wformat=2 -Wimplicit-fallthrough -Wduplicated-cond -Wduplicated-branches -Wlogical-op -Wuseless-cast /home/pkoziol/repos/aoc22/imports/aoc22/day2.cppm -MT src/CMakeFiles/aoc22.dir//imports/aoc22/day2.cppm.o.ddi -MD -MF src/CMakeFiles/aoc22.dir//imports/aoc22/day2.cppm.o.ddi.d -fdeps-file=src/CMakeFiles/aoc22.dir//imports/aoc22/day2.cppm.o.ddi -fdeps-target=src/CMakeFiles/aoc22.dir//imports/aoc22/day2.cppm.o
[build] /usr/bin/ld:/home/pkoziol/repos/aoc22/imports/aoc22/day2.cppm: file format not recognized; treating as linker script
(Note the compiler flags mentioned in https://www.kitware.com/import-cmake-c20-modules/ are outdated)
Should I use “-x c++” option? Clang doesn’t have problem with this.
Also,I am setting set(CMAKE_CXX_EXTENSIONS OFF)