From fa1d675309c6a08b0833cf25cffe476c6166aba3 Mon Sep 17 00:00:00 2001 From: Malcolm Smith Date: Thu, 29 Feb 2024 21:58:20 +0000 Subject: [PATCH] gh-71052: Fix several Android build issues (#115955) This change is part of the work on PEP-738: Adding Android as a supported platform. * Remove the "1.0" suffix from libpython's filename on Android, which would prevent Gradle from packaging it into an app. * Simplify the build command in the Makefile so that libpython always gets given an SONAME with the `-Wl-h` argument, even if the SONAME is identical to the actual filename. * Disable a number of functions on Android which can be compiled and linked against, but always fail at runtime. As a result, the native _multiprocessing module is no longer built for Android. * gh-115390 (bee7bb331) added some pre-determined results to the configure script for things that can't be autodetected when cross-compiling; this change adds Android to these where appropriate. * Add a couple more pre-determined results for Android, and making them cover iOS as well. This means the --enable-ipv6 configure option will no longer be required on either platform. --- Lib/ctypes/__init__.py | 2 + Makefile.pre.in | 6 +-- ...4-02-26-14-54-58.gh-issue-71052.XvFay1.rst | 1 + Modules/_multiprocessing/multiprocessing.c | 2 +- configure | 47 ++++++++++++++--- configure.ac | 50 +++++++++++++++---- 6 files changed, 87 insertions(+), 21 deletions(-) create mode 100644 Misc/NEWS.d/next/Build/2024-02-26-14-54-58.gh-issue-71052.XvFay1.rst diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py index 141142a57dc..d54ee05b15f 100644 --- a/Lib/ctypes/__init__.py +++ b/Lib/ctypes/__init__.py @@ -468,6 +468,8 @@ pydll = LibraryLoader(PyDLL) if _os.name == "nt": pythonapi = PyDLL("python dll", None, _sys.dllhandle) +elif hasattr(_sys, "getandroidapilevel"): + pythonapi = PyDLL("libpython%d.%d.so" % _sys.version_info[:2]) elif _sys.platform == "cygwin": pythonapi = PyDLL("libpython%d.%d.dll" % _sys.version_info[:2]) else: diff --git a/Makefile.pre.in b/Makefile.pre.in index 7533a49b439..ee65ecd918c 100644 --- a/Makefile.pre.in +++ b/Makefile.pre.in @@ -859,11 +859,9 @@ $(LIBRARY): $(LIBRARY_OBJS) $(AR) $(ARFLAGS) $@ $(LIBRARY_OBJS) libpython$(LDVERSION).so: $(LIBRARY_OBJS) $(DTRACE_OBJS) - if test $(INSTSONAME) != $(LDLIBRARY); then \ - $(BLDSHARED) -Wl,-h$(INSTSONAME) -o $(INSTSONAME) $(LIBRARY_OBJS) $(MODLIBS) $(SHLIBS) $(LIBC) $(LIBM); \ + $(BLDSHARED) -Wl,-h$(INSTSONAME) -o $(INSTSONAME) $(LIBRARY_OBJS) $(MODLIBS) $(SHLIBS) $(LIBC) $(LIBM) + if test $(INSTSONAME) != $@; then \ $(LN) -f $(INSTSONAME) $@; \ - else \ - $(BLDSHARED) -o $@ $(LIBRARY_OBJS) $(MODLIBS) $(SHLIBS) $(LIBC) $(LIBM); \ fi libpython3.so: libpython$(LDVERSION).so diff --git a/Misc/NEWS.d/next/Build/2024-02-26-14-54-58.gh-issue-71052.XvFay1.rst b/Misc/NEWS.d/next/Build/2024-02-26-14-54-58.gh-issue-71052.XvFay1.rst new file mode 100644 index 00000000000..bda91335814 --- /dev/null +++ b/Misc/NEWS.d/next/Build/2024-02-26-14-54-58.gh-issue-71052.XvFay1.rst @@ -0,0 +1 @@ +Fix several Android build issues diff --git a/Modules/_multiprocessing/multiprocessing.c b/Modules/_multiprocessing/multiprocessing.c index 2e6d8eb68c0..1f6ab718a36 100644 --- a/Modules/_multiprocessing/multiprocessing.c +++ b/Modules/_multiprocessing/multiprocessing.c @@ -181,7 +181,7 @@ static PyMethodDef module_methods[] = { _MULTIPROCESSING_RECV_METHODDEF _MULTIPROCESSING_SEND_METHODDEF #endif -#if !defined(POSIX_SEMAPHORES_NOT_ENABLED) && !defined(__ANDROID__) +#if !defined(POSIX_SEMAPHORES_NOT_ENABLED) _MULTIPROCESSING_SEM_UNLINK_METHODDEF #endif {NULL} diff --git a/configure b/configure index f431c5dd15e..45f232164e7 100755 --- a/configure +++ b/configure @@ -7423,7 +7423,13 @@ printf "%s\n" "#define Py_ENABLE_SHARED 1" >>confdefs.h LDLIBRARY='libpython$(LDVERSION).so' BLDLIBRARY='-L. -lpython$(LDVERSION)' RUNSHARED=LD_LIBRARY_PATH=`pwd`${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}} - INSTSONAME="$LDLIBRARY".$SOVERSION + + # The Android Gradle plugin will only package libraries whose names end + # with ".so". + if test "$ac_sys_system" != "Linux-android"; then + INSTSONAME="$LDLIBRARY".$SOVERSION + fi + if test "$with_pydebug" != yes then PY3LIBRARY=libpython3.so @@ -13726,7 +13732,14 @@ then : else $as_nop if test "$cross_compiling" = yes then : + +# "yes" changes the hash function to FNV, which causes problems with Numba +# (https://github.com/numba/numba/blob/0.59.0/numba/cpython/hashing.py#L470). +if test "$ac_sys_system" = "Linux-android"; then + ac_cv_aligned_required=no +else ac_cv_aligned_required=yes +fi else $as_nop cat confdefs.h - <<_ACEOF >conftest.$ac_ext /* end confdefs.h. */ @@ -17529,6 +17542,23 @@ else printf "%s\n" "$MACHDEP_OBJS" >&6; } fi +if test "$ac_sys_system" = "Linux-android"; then + # When these functions are used in an unprivileged process, they crash rather + # than returning an error. + privileged_funcs="chroot initgroups setegid seteuid setgid setregid setresgid + setresuid setreuid setuid" + + # These functions are unimplemented and always return an error. + unimplemented_funcs="sem_open sem_unlink" + + for name in $privileged_funcs $unimplemented_funcs; do + as_func_var=`printf "%s\n" "ac_cv_func_$name" | $as_tr_sh` + + eval "$as_func_var=no" + + done +fi + # checks for library functions ac_fn_c_check_func "$LINENO" "accept4" "ac_cv_func_accept4" if test "x$ac_cv_func_accept4" = xyes @@ -22012,10 +22042,11 @@ fi done -# On iOS, clock_settime can be linked (so it is found by -# configure), but it raises a runtime error if used because apps can't change -# the clock. Force the symbol off. -if test "$ac_sys_system" != "iOS" ; then +# On Android and iOS, clock_settime can be linked (so it is found by +# configure), but when used in an unprivileged process, it crashes rather than +# returning an error. Force the symbol off. +if test "$ac_sys_system" != "Linux-android" && test "$ac_sys_system" != "iOS" +then for ac_func in clock_settime do : @@ -22295,7 +22326,9 @@ else $as_nop if test "$cross_compiling" = yes then : -if test "${enable_ipv6+set}" = set; then +if test "$ac_sys_system" = "Linux-android" || test "$ac_sys_system" = "iOS"; then + ac_cv_buggy_getaddrinfo="no" +elif test "${enable_ipv6+set}" = set; then ac_cv_buggy_getaddrinfo="no -- configured with --(en|dis)able-ipv6" else ac_cv_buggy_getaddrinfo=yes @@ -26968,7 +27001,7 @@ CPPFLAGS=$ac_save_cppflags { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for device files" >&5 printf "%s\n" "$as_me: checking for device files" >&6;} -if test "$ac_sys_system" = "iOS" ; then +if test "$ac_sys_system" = "Linux-android" || test "$ac_sys_system" = "iOS"; then ac_cv_file__dev_ptmx=no ac_cv_file__dev_ptc=no else diff --git a/configure.ac b/configure.ac index a5abb06a829..b7671facc65 100644 --- a/configure.ac +++ b/configure.ac @@ -1443,7 +1443,13 @@ if test $enable_shared = "yes"; then LDLIBRARY='libpython$(LDVERSION).so' BLDLIBRARY='-L. -lpython$(LDVERSION)' RUNSHARED=LD_LIBRARY_PATH=`pwd`${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}} - INSTSONAME="$LDLIBRARY".$SOVERSION + + # The Android Gradle plugin will only package libraries whose names end + # with ".so". + if test "$ac_sys_system" != "Linux-android"; then + INSTSONAME="$LDLIBRARY".$SOVERSION + fi + if test "$with_pydebug" != yes then PY3LIBRARY=libpython3.so @@ -3675,7 +3681,14 @@ int main(void) }]])], [ac_cv_aligned_required=no], [ac_cv_aligned_required=yes], -[ac_cv_aligned_required=yes]) +[ +# "yes" changes the hash function to FNV, which causes problems with Numba +# (https://github.com/numba/numba/blob/0.59.0/numba/cpython/hashing.py#L470). +if test "$ac_sys_system" = "Linux-android"; then + ac_cv_aligned_required=no +else + ac_cv_aligned_required=yes +fi]) ]) if test "$ac_cv_aligned_required" = yes ; then AC_DEFINE([HAVE_ALIGNED_REQUIRED], [1], @@ -4872,6 +4885,22 @@ else AC_MSG_RESULT([$MACHDEP_OBJS]) fi +if test "$ac_sys_system" = "Linux-android"; then + # When these functions are used in an unprivileged process, they crash rather + # than returning an error. + privileged_funcs="chroot initgroups setegid seteuid setgid setregid setresgid + setresuid setreuid setuid" + + # These functions are unimplemented and always return an error. + unimplemented_funcs="sem_open sem_unlink" + + for name in $privileged_funcs $unimplemented_funcs; do + AS_VAR_PUSHDEF([func_var], [ac_cv_func_$name]) + AS_VAR_SET([func_var], [no]) + AS_VAR_POPDEF([func_var]) + done +fi + # checks for library functions AC_CHECK_FUNCS([ \ accept4 alarm bind_textdomain_codeset chmod chown clock closefrom close_range confstr \ @@ -5216,10 +5245,11 @@ AC_CHECK_FUNCS([clock_getres], [], [ ]) ]) -# On iOS, clock_settime can be linked (so it is found by -# configure), but it raises a runtime error if used because apps can't change -# the clock. Force the symbol off. -if test "$ac_sys_system" != "iOS" ; then +# On Android and iOS, clock_settime can be linked (so it is found by +# configure), but when used in an unprivileged process, it crashes rather than +# returning an error. Force the symbol off. +if test "$ac_sys_system" != "Linux-android" && test "$ac_sys_system" != "iOS" +then AC_CHECK_FUNCS([clock_settime], [], [ AC_CHECK_LIB([rt], [clock_settime], [ AC_DEFINE([HAVE_CLOCK_SETTIME], [1]) @@ -5371,7 +5401,9 @@ int main(void) [ac_cv_buggy_getaddrinfo=no], [ac_cv_buggy_getaddrinfo=yes], [ -if test "${enable_ipv6+set}" = set; then +if test "$ac_sys_system" = "Linux-android" || test "$ac_sys_system" = "iOS"; then + ac_cv_buggy_getaddrinfo="no" +elif test "${enable_ipv6+set}" = set; then ac_cv_buggy_getaddrinfo="no -- configured with --(en|dis)able-ipv6" else ac_cv_buggy_getaddrinfo=yes @@ -6589,9 +6621,9 @@ CPPFLAGS=$ac_save_cppflags AC_MSG_NOTICE([checking for device files]) dnl NOTE: Inform user how to proceed with files when cross compiling. -dnl iOS cross-compile builds are predictable; they won't ever +dnl Some cross-compile builds are predictable; they won't ever dnl have /dev/ptmx or /dev/ptc, so we can set them explicitly. -if test "$ac_sys_system" = "iOS" ; then +if test "$ac_sys_system" = "Linux-android" || test "$ac_sys_system" = "iOS"; then ac_cv_file__dev_ptmx=no ac_cv_file__dev_ptc=no else