[BUG] can't link c++ so if python is compiled with ccache since 72.2.0

[trim21]

setuptools version

setuptools >= 72.2.0

Python version

python 3.10

OS

debian 12

Additional environment information

No response

Description

I have a python compiled by pyenv with ccache, and since 72.2.0, setuptools can't link so as expected.

(bencode2) trim21@omv ~/proj/bencode2 $ python setup.py build_ext -i --force
running build_ext
building 'bencode2.__bencode' extension
ccache /usr/bin/c++ -Wno-unused-result -Wsign-compare -DNDEBUG -g -O3 -Wall -march=native -mtune=native -fPIC -DFMT_HEADER_ONLY= -I./src/bencode2 -I./vendor/fmt/include -I./vendor/small_vector/source/include -I/home/trim21/proj/bencode2/.venv/lib/python3.10/site-packages/pybind11/include -I/home/trim21/proj/bencode2/.venv/include -I/home/trim21/.pyenv/versions/3.10.15/include/python3.10 -c ./src/bencode2/bencode.cpp -o build/temp.linux-x86_64-cpython-310/./src/bencode2/bencode.o -fvisibility=hidden -g0 -std=c++17
ccache /usr/bin/c++ -Wno-unused-result -Wsign-compare -DNDEBUG -g -O3 -Wall -march=native -mtune=native /usr/bin/c++ -shared build/temp.linux-x86_64-cpython-310/./src/bencode2/bencode.o -L/home/trim21/.pyenv/versions/3.10.15/lib -o build/lib.linux-x86_64-cpython-310/bencode2/__bencode.cpython-310-x86_64-linux-gnu.so
/usr/bin/ld: cannot use executable file '/usr/bin/c++' as input to a link
collect2: error: ld returned 1 exit status
error: command '/usr/bin/ccache' failed with exit code 1

(bencode2) trim21@omv ~/proj/bencode2 $ python -m sysconfig|grep ccache
        BLDSHARED = "ccache /usr/bin/cc -shared -L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib -L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib"
        CC = "ccache /usr/bin/cc"
        CONFIG_ARGS = "'--prefix=/home/trim21/.pyenv/versions/3.10.15' '--libdir=/home/trim21/.pyenv/versions/3.10.15/lib' '--enable-shared' 'CC=ccache /usr/bin/cc' 'CFLAGS= -march=native -mtune=native' 'LDFLAGS=-L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib' 'LIBS=-L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib' 'CPPFLAGS=-I/home/trim21/.pyenv/versions/3.10.15/include'"
        CXX = "ccache /usr/bin/c++"
        LDCXXSHARED = "ccache /usr/bin/c++ -shared"
        LDSHARED = "ccache /usr/bin/cc -shared -L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib -L/home/trim21/.pyenv/versions/3.10.15/lib -Wl,-rpath,/home/trim21/.pyenv/versions/3.10.15/lib"
        LINKCC = "ccache /usr/bin/cc"
        MAINCC = "ccache /usr/bin/cc"

Expected behavior

it should build so as expected

How to Reproduce

you will need to install pyenv, compile python with https://github.com/pyenv/pyenv-ccache

then use this python to build binary module,

for example

git clone https://github.com/trim21/bencode-py
cd bencode-py
pyenv local 3.10
python -m venv .venv
source .venv/bin/activate
pip install -r requirements.txt
python setup.py build_ext -i --force

Output

(bencode2) trim21@omv ~/proj/bencode2 $ python setup.py build_ext -i --force -g
running build_ext
building 'bencode2.__bencode' extension
ccache /usr/bin/c++ -Wno-unused-result -Wsign-compare -DNDEBUG -g -O3 -Wall -march=native -mtune=native -fPIC -g -DFMT_HEADER_ONLY= -I./src/bencode2 -I./vendor/fmt/include -I./vendor/small_vector/source/include -I/home/trim21/proj/bencode2/.venv/lib/python3.10/site-packages/pybind11/include -I/home/trim21/proj/bencode2/.venv/include -I/home/trim21/.pyenv/versions/3.10.15/include/python3.10 -c ./src/bencode2/bencode.cpp -o build/temp.linux-x86_64-cpython-310/./src/bencode2/bencode.o -fvisibility=hidden -g0 -std=c++17
ccache /usr/bin/c++ -Wno-unused-result -Wsign-compare -DNDEBUG -g -O3 -Wall -march=native -mtune=native /usr/bin/c++ -shared -g build/temp.linux-x86_64-cpython-310/./src/bencode2/bencode.o -L/home/trim21/.pyenv/versions/3.10.15/lib -o build/lib.linux-x86_64-cpython-310/bencode2/__bencode.cpython-310-x86_64-linux-gnu.so
/usr/bin/ld: cannot use executable file '/usr/bin/c++' as input to a link
collect2: error: ld returned 1 exit status
error: command '/usr/bin/ccache' failed with exit code 1

[trim21]

some testing:

54936c7 is good

64f10c5 is bad

this is caused by #4539

[bjodah]

I ran into this problem myself today (cpython 3.13.1), the symptom is somewhat different though, even though ccache was used to compile cpython (manual build and install of cpython from source), the linking command does not reference ccache, but it repeats the name of the compiler twice:

      clang++ -isystem /opt-3/sundials-6.7.0-asan/include -fsanitize=address -stdlib++-isystem /opt-2/libcxx19-asan/include/c++/v1 -ferror-limit=5 -fPIC -DPYCVODES_NO_KLU=0 -DPYCVODES_NO_LAPACK=0 -DANYODE_NO_LAPACK=0 -I/tmp/pip-build-env-uzzybwax/overlay/lib/python3.13/site-packages/numpy/_core/include -Ipycvodes/include -Iexternal/anyode/include -I/opt-3/cpython-v3.13.1-asan/include/python3.13d -c pycvodes/_cvodes.cpp -o build/temp.linux-x86_64-cpython-313-pydebug/pycvodes/_cvodes.o -DVERSION_INFO=\"0.15.0.dev0+git\" -std=c++17
      In file included from pycvodes/_cvodes.cpp:1280:
      In file included from /tmp/pip-build-env-uzzybwax/overlay/lib/python3.13/site-packages/numpy/_core/include/numpy/arrayobject.h:5:
      In file included from /tmp/pip-build-env-uzzybwax/overlay/lib/python3.13/site-packages/numpy/_core/include/numpy/ndarrayobject.h:12:
      In file included from /tmp/pip-build-env-uzzybwax/overlay/lib/python3.13/site-packages/numpy/_core/include/numpy/ndarraytypes.h:1913:
      /tmp/pip-build-env-uzzybwax/overlay/lib/python3.13/site-packages/numpy/_core/include/numpy/npy_1_7_deprecated_api.h:17:2: warning: "Using deprecated NumPy API, disable it with "          "#define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-W#warnings]
         17 | #warning "Using deprecated NumPy API, disable it with " \
            |  ^
      1 warning generated.
      clang++ -isystem /opt-3/sundials-6.7.0-asan/include -fsanitize=address -stdlib++-isystem /opt-2/libcxx19-asan/include/c++/v1 -ferror-limit=5 clang++ -shared -fsanitize=address -Wl,-rpath=/opt-3/cpython-v3.13.1-asan/lib -lsundials_nvecserial -lsundials_cvodes -lsundials_sunlinsolspgmr -lsundials_sunlinsolspbcgs -lsundials_sunlinsolsptfqmr -lsundials_sunmatrixdense -lsundials_sunmatrixband -lsundials_sunlinsollapackdense -lsundials_sunlinsollapackband -lsundials_sunlinsolklu -Wl,--disable-new-dtags -Wl,-rpath,/opt-3/sundials-6.7.0-asan/lib -L/opt-3/sundials-6.7.0-asan/lib -lopenblas -fsanitize=address -Wl,-rpath,/opt-2/libcxx19-asan/lib -L/opt-2/libcxx19-asan/lib -lc++ -lc++abi -stdlib=libc++ -isystem /opt-3/sundials-6.7.0-asan/include -fsanitize=address -stdlib++-isystem /opt-2/libcxx19-asan/include/c++/v1 -ferror-limit=5 build/temp.linux-x86_64-cpython-313-pydebug/pycvodes/_cvodes.o -lsundials_nvecserial -lsundials_cvodes -lsundials_sunlinsolspgmr -lsundials_sunlinsolspbcgs -lsundials_sunlinsolsptfqmr -lsundials_sunmatrixdense -lsundials_sunmatrixband -lsundials_sunlinsollapackdense -lsundials_sunlinsollapackband -lsundials_sunlinsolklu -o build/lib.linux-x86_64-cpython-313-pydebug/pycvodes/_cvodes.cpython-313d-x86_64-linux-gnu.so
      clang++: error: no such file or directory: 'clang++'
      [end of output]

If I pin "setuptools==72.1.0" in pyproject.toml, the extension compiles and links just fine.