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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Build failure on 32-bit OS: incompatible type in tp_hash in PyTypeObject","articleBody":"Current mod_python v3.5.0.6 fails to build on 32-bit OS (e.g., armhf, i386, ...):\n\n* Build log: https://buildd.debian.org/status/fetch.php?pkg=libapache2-mod-python\u0026arch=i386\u0026ver=3.5.0.6-1\u0026stamp=1767544870\u0026raw=0\n\n```\nBuilding mod_python.so.\n\n/usr/bin/apxs2 -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13 -Wc,-ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=.  -c mod_python.c _apachemodule.c requestobject.c tableobject.c util.c serverobject.c connobject.c filterobject.c hlist.c hlistobject.c finfoobject.c version.c include/_apachemodule.h  include/filterobject.h  include/hlist.h include/mod_python.h  include/psp_flex.h include/psp_parser.h include/requestobject.h include/tableobject.h include/connobject.h include/finfoobject.h include/hlistobject.h include/mp_version.h include/_pspmodule.h  include/psp_string.h  include/serverobject.h include/util.h -L/usr/lib/python3.13/config-3.13-i386-linux-gnu -L/usr/lib/i386-linux-gnu -lpython3.13 -ldl  -lm   \n/usr/share/apr-1.0/build/libtool  --mode=compile --tag=disable-static i686-linux-gnu-gcc -prefer-pic -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2   -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE   -I/usr/include/apache2  -I/usr/include/apr-1.0   -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13  -c -o mod_python.lo mod_python.c \u0026\u0026 touch mod_python.slo\nlibtool: compile:  i686-linux-gnu-gcc -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -I/usr/include/apache2 -I/usr/include/apr-1.0 -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13 -c mod_python.c  -fPIC -DPIC -o .libs/mod_python.o\n/usr/share/apr-1.0/build/libtool  --mode=compile --tag=disable-static i686-linux-gnu-gcc -prefer-pic -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2   -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE   -I/usr/include/apache2  -I/usr/include/apr-1.0   -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13  -c -o _apachemodule.lo _apachemodule.c \u0026\u0026 touch _apachemodule.slo\nlibtool: compile:  i686-linux-gnu-gcc -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -I/usr/include/apache2 -I/usr/include/apr-1.0 -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13 -c _apachemodule.c  -fPIC -DPIC -o .libs/_apachemodule.o\n/usr/share/apr-1.0/build/libtool  --mode=compile --tag=disable-static i686-linux-gnu-gcc -prefer-pic -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2   -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE   -I/usr/include/apache2  -I/usr/include/apr-1.0   -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13  -c -o requestobject.lo requestobject.c \u0026\u0026 touch requestobject.slo\nlibtool: compile:  i686-linux-gnu-gcc -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -I/usr/include/apache2 -I/usr/include/apr-1.0 -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13 -c requestobject.c  -fPIC -DPIC -o .libs/requestobject.o\n/usr/share/apr-1.0/build/libtool  --mode=compile --tag=disable-static i686-linux-gnu-gcc -prefer-pic -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security  -Wdate-time -D_FORTIFY_SOURCE=2   -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE   -I/usr/include/apache2  -I/usr/include/apr-1.0   -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13  -c -o tableobject.lo tableobject.c \u0026\u0026 touch tableobject.slo\nlibtool: compile:  i686-linux-gnu-gcc -pipe -g -O2 -Werror=implicit-function-declaration -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -DLINUX -D_REENTRANT -D_GNU_SOURCE -D_LARGEFILE64_SOURCE -I/usr/include/apache2 -I/usr/include/apr-1.0 -I/usr/include/apr-1.0 -I/usr/include -ffile-prefix-map=/build/reproducible-path/libapache2-mod-python-3.5.0.6=. -I/build/reproducible-path/libapache2-mod-python-3.5.0.6/src/include -I/usr/include/python3.13 -I/usr/include/python3.13 -c tableobject.c  -fPIC -DPIC -o .libs/tableobject.o\ntableobject.c:1203:5: error: initialization of 'Py_hash_t (*)(PyObject *)' {aka 'int (*)(struct _object *)'} from incompatible pointer type 'long int (*)(PyObject *)' {aka 'long int (*)(struct _object *)'} [-Wincompatible-pointer-types]\n 1203 |     table_nohash,                       /* tp_hash */\n      |     ^~~~~~~~~~~~\ntableobject.c:1203:5: note: (near initialization for 'MpTable_Type.tp_hash')\ntableobject.c:1161:13: note: 'table_nohash' declared here\n 1161 | static long table_nohash(PyObject *self)\n      |             ^~~~~~~~~~~~\napxs:Error: Command failed with rc=65536\n.\nmake[3]: *** [Makefile:57: mod_python.so] Error 1\n```\n\nThe reason is that `*hashfunc` as defined in https://docs.python.org/3/c-api/typeobj.html#c.hashfunc has type `Py_hash_t`, which is of type `signed integer` as defined at https://docs.python.org/3/c-api/hash.html#c.Py_hash_t . However, in https://github.com/grisha/mod_python/blob/52f8975829a0a3c467f089894e884d29c83e8a5e/src/tableobject.c#L1161 you are using `long` instead. On 32-bit OS, `long` may not equal to `int` and thus the build error happens.\n\nThe solution could be directly using `Py_hash_t`, instead of hardcoding `int` or `long` for function return.","author":{"url":"https://github.com/hosiet","@type":"Person","name":"hosiet"},"datePublished":"2026-01-04T17:39:05.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/149/mod_python/issues/149"}