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GH-133171: Prevent combinations of --disable-gil and --enable-experimental-jit (for now) #133179

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GH-133171: Prevent combinations of --disable-gil and --enable-experimental-jit (for now) #133179

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1076f10
--disable-gil doesn't support --enable-experimental-jit
brandtbucher Apr 29, 2025
9b9ff5d
blurb add
brandtbucher Apr 29, 2025
976cdb9
Remove JIT/FT CI job
brandtbucher Apr 30, 2025
fd55937
Merge branch 'main' into nogil-means-nojit
brandtbucher May 2, 2025
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53 changes: 27 additions & 26 deletions .github/workflows/jit.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -126,29 +126,30 @@ jobs:
make all --jobs 4
./python -m test --multiprocess 0 --timeout 4500 --verbose2 --verbose3

jit-with-disabled-gil:
name: Free-Threaded (Debug)
needs: interpreter
runs-on: ubuntu-24.04
timeout-minutes: 90
strategy:
fail-fast: false
matrix:
llvm:
- 19
steps:
- uses: actions/checkout@v4
with:
persist-credentials: false
- uses: actions/setup-python@v5
with:
python-version: '3.11'
- name: Build with JIT enabled and GIL disabled
run: |
sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" ./llvm.sh ${{ matrix.llvm }}
export PATH="$(llvm-config-${{ matrix.llvm }} --bindir):$PATH"
./configure --enable-experimental-jit --with-pydebug --disable-gil
make all --jobs 4
- name: Run tests
run: |
./python -m test --multiprocess 0 --timeout 4500 --verbose2 --verbose3
# XXX: GH-133171
# jit-with-disabled-gil:
# name: Free-Threaded (Debug)
# needs: interpreter
# runs-on: ubuntu-24.04
# timeout-minutes: 90
# strategy:
# fail-fast: false
# matrix:
# llvm:
# - 19
# steps:
# - uses: actions/checkout@v4
# with:
# persist-credentials: false
# - uses: actions/setup-python@v5
# with:
# python-version: '3.11'
# - name: Build with JIT enabled and GIL disabled
# run: |
# sudo bash -c "$(wget -O - https://apt.llvm.org/llvm.sh)" ./llvm.sh ${{ matrix.llvm }}
# export PATH="$(llvm-config-${{ matrix.llvm }} --bindir):$PATH"
# ./configure --enable-experimental-jit --with-pydebug --disable-gil
# make all --jobs 4
# - name: Run tests
# run: |
# ./python -m test --multiprocess 0 --timeout 4500 --verbose2 --verbose3
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2025-04-29-15-29-11.gh-issue-133171.YbwbwP.rst
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@@ -0,0 +1,2 @@
Since free-threaded builds do not support the experimental JIT compiler,
prevent these configurations from being combined.
7 changes: 7 additions & 0 deletions PCbuild/build.bat
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Expand Up @@ -123,6 +123,13 @@ if "%do_pgo%" EQU "true" if "%platf%" EQU "x64" (
)
)

if "%UseDisableGil%" EQU "true" if "%UseTIER2%" NEQ "" (
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Strictly speaking this would be better as target in pythoncore.vcxproj (see the existing _WarnAboutZlib for example), since there's no requirement to use the batch file, and it's very easy to bypass it. (The same goes for the PGO warning above, I don't remember when that was added.)

But it's not a big deal. It's relatively temporary code anyway

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Yeah, this will only be around for 3.14. I could just put an #error in the C source or whatever, but I figure failing early is best.

Besides, it's not like there's anything wrong with enabling both features. It just doesn't work the way you'd expect.

rem GH-133171: This configuration builds the JIT but never actually uses it,
rem which is surprising (and strictly worse than not building it at all):
echo.ERROR: --experimental-jit cannot be used with --disable-gil.
exit /b 1
)

if not exist "%GIT%" where git > "%TEMP%\git.loc" 2> nul && set /P GIT= < "%TEMP%\git.loc" & del "%TEMP%\git.loc"
if exist "%GIT%" set GITProperty=/p:GIT="%GIT%"
if not exist "%GIT%" echo Cannot find Git on PATH & set GITProperty=
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6 changes: 6 additions & 0 deletions configure
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6 changes: 6 additions & 0 deletions configure.ac
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Expand Up @@ -2786,6 +2786,12 @@ AC_SUBST([REGEN_JIT_COMMAND])
AC_SUBST([JIT_STENCILS_H])
AC_MSG_RESULT([$tier2_flags $jit_flags])

if test "$disable_gil" = "yes" -a "$enable_experimental_jit" != "no"; then
# GH-133171: This configuration builds the JIT but never actually uses it,
# which is surprising (and strictly worse than not building it at all):
AC_MSG_ERROR([--enable-experimental-jit cannot be used with --disable-gil.])
fi

case "$ac_cv_cc_name" in
mpicc)
CFLAGS_NODIST="$CFLAGS_NODIST"
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