176 lines
6.1 KiB
Diff
176 lines
6.1 KiB
Diff
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http://sourceware.org/ml/gdb-patches/2015-02/msg00091.html
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Subject: [patch] Fix Python 3 build error on 32-bit hosts
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--ZPt4rx8FFjLCG7dd
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Content-Type: text/plain; charset=iso-2022-jp
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Content-Disposition: inline
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Hi,
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on Fedora Rawhide (==22) i686 using --with-python=/usr/bin/python3 one gets:
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gcc -g -I. -I. -I./common -I./config -DLOCALEDIR="\"/usr/local/share/locale\"" -DHAVE_CONFIG_H -I./../include/opcode -I./../opcodes/.. -I./../readline/.. -I../bfd -I./../bfd -I./../include -I../libdecnumber -I./../libdecnumber -I./gnulib/import -Ibuild-gnulib/import -DTUI=1 -pthread -I/usr/include/guile/2.0 -I/usr/include/python3.4m -I/usr/include/python3.4m -Wall -Wdeclaration-after-statement -Wpointer-arith -Wpointer-sign -Wno-unused -Wunused-value -Wunused-function -Wno-switch -Wno-char-subscripts -Wmissing-prototypes -Wdeclaration-after-statement -Wempty-body -Wmissing-parameter-type -Wold-style-declaration -Wold-style-definition -Wformat-nonliteral -Werror -c -o py-value.o -MT py-value.o -MMD -MP -MF .deps/py-value.Tpo -fno-strict-aliasing -DNDEBUG -fwrapv ./python/py-value.c
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./python/py-value.c:1696:3: error: initialization from incompatible pointer type [-Werror]
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valpy_hash, /*tp_hash*/
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^
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./python/py-value.c:1696:3: error: (near initialization for $B!F(Bvalue_object_type.tp_hash$B!G(B) [-Werror]
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cc1: all warnings being treated as errors
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Makefile:2628: recipe for target 'py-value.o' failed
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This is because in Python 2 tp_hash was:
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typedef long (*hashfunc)(PyObject *);
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while in Python 3 tp_hash is:
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typedef Py_hash_t (*hashfunc)(PyObject *);
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Py_hash_t is int for 32-bit hosts and long for 64-bit hosts. While on 32-bit
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hosts sizeof(long)==sizeof(int) still the hashfunc type is formally
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incompatible. As this patch should have no compiled code change it is not
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really necessary for gdb-7.9, it would fix there just this non-fatal
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compilation warning:
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./python/py-value.c:1696:3: warning: initialization from incompatible pointer type
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valpy_hash, /*tp_hash*/
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^
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./python/py-value.c:1696:3: warning: (near initialization for $B!F(Bvalue_object_type.tp_hash$B!G(B)
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A question is whether the autoconf test isn't an overkill. One could use
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instead just:
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#if PYTHON_ABI_VERSION >= 3
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Also one could use that #if either just at the valpy_hash() definition or one
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could provide Py_hash_t in gdb/defs.h or one could provide some GDB_Py_hash_t
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in gdb/defs.h.
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Tested compilation with:
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python-devel-2.7.9-4.fc22.x86_64
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python-devel-2.7.9-4.fc22.i686
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python3-devel-3.4.2-4.fc22.x86_64
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python3-devel-3.4.2-4.fc22.i686
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Jan
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--ZPt4rx8FFjLCG7dd
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Content-Type: text/plain; charset=us-ascii
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Content-Disposition: inline; filename=1
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gdb/
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2015-02-04 Jan Kratochvil <jan.kratochvil@redhat.com>
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* configure.ac <"${have_libpython}" != no>: Define Py_hash_t.
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* python/py-value.c (valpy_fetch_lazy): Use it. Remove cast to the
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return type.
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* config.in: Regenerate.
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* configure: Regenerate.
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diff --git a/gdb/config.in b/gdb/config.in
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index 806cbac..44acfac 100644
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--- a/gdb/config.in
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+++ b/gdb/config.in
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@@ -617,6 +617,9 @@
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/* Define if the python directory should be relocated when GDB is moved. */
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#undef PYTHON_PATH_RELOCATABLE
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+/* Provide Python 3 Py_hash_t for Python 2. */
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+#undef Py_hash_t
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+
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/* Relocated directory for source files. */
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#undef RELOC_SRCDIR
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diff --git a/gdb/configure b/gdb/configure
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index 9632f9a..65f5b2c 100755
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--- a/gdb/configure
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+++ b/gdb/configure
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@@ -8749,6 +8749,45 @@ rm -f conftest.err conftest.$ac_ext
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: ${python_has_threads}" >&5
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$as_echo "${python_has_threads}" >&6; }
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CPPFLAGS="${saved_CPPFLAGS}"
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+
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+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for Py_hash_t" >&5
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+$as_echo_n "checking for Py_hash_t... " >&6; }
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+if test "${gdb_cv_Py_hash_t+set}" = set; then :
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+ $as_echo_n "(cached) " >&6
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+else
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+ old_CFLAGS="$CFLAGS"
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+ CFLAGS="$CFLAGS $PYTHON_CFLAGS"
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+ old_CPPFLAGS="$CPPFLAGS"
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+ CPPFLAGS="$CPPFLAGS $PYTHON_CPPFLAGS"
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+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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+/* end confdefs.h. */
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+#include <Python.h>
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+int
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+main ()
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+{
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+Py_hash_t var;
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+ ;
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+ return 0;
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+}
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+_ACEOF
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+if ac_fn_c_try_compile "$LINENO"; then :
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+ gdb_cv_Py_hash_t=yes
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+else
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+ gdb_cv_Py_hash_t=no
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+
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+fi
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+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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+ CPPFLAGS="$old_CPPFLAGS"
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+ CFLAGS="$old_CFLAGS"
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+
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+fi
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+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gdb_cv_Py_hash_t" >&5
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+$as_echo "$gdb_cv_Py_hash_t" >&6; }
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+ if test "x$gdb_cv_Py_hash_t" = "xno"; then
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+
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+$as_echo "#define Py_hash_t long" >>confdefs.h
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+
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+ fi
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else
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# Even if Python support is not compiled in, we need to have this file
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# included so that the "python" command, et.al., still exists.
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diff --git a/gdb/configure.ac b/gdb/configure.ac
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index dfc6947..f335b7b 100644
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--- a/gdb/configure.ac
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+++ b/gdb/configure.ac
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@@ -1016,6 +1016,25 @@ if test "${have_libpython}" != no; then
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]]), [python_has_threads=no], [python_has_threads=yes])
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AC_MSG_RESULT(${python_has_threads})
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CPPFLAGS="${saved_CPPFLAGS}"
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+
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+ AC_CACHE_CHECK([for Py_hash_t], gdb_cv_Py_hash_t,
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+ old_CFLAGS="$CFLAGS"
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+ CFLAGS="$CFLAGS $PYTHON_CFLAGS"
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+ old_CPPFLAGS="$CPPFLAGS"
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+ CPPFLAGS="$CPPFLAGS $PYTHON_CPPFLAGS"
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+ AC_TRY_COMPILE(
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+ [#include <Python.h>],
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+ [Py_hash_t var;],
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+ gdb_cv_Py_hash_t=yes,
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+ gdb_cv_Py_hash_t=no
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+ )
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+ CPPFLAGS="$old_CPPFLAGS"
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+ CFLAGS="$old_CFLAGS"
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+ )
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+ if test "x$gdb_cv_Py_hash_t" = "xno"; then
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+ AC_DEFINE(Py_hash_t, long,
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+ [Provide Python 3 Py_hash_t for Python 2.])
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+ fi
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else
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# Even if Python support is not compiled in, we need to have this file
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# included so that the "python" command, et.al., still exists.
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diff --git a/gdb/python/py-value.c b/gdb/python/py-value.c
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index 4c4d36e..5a13777 100644
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--- a/gdb/python/py-value.c
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+++ b/gdb/python/py-value.c
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@@ -895,10 +895,10 @@ valpy_fetch_lazy (PyObject *self, PyObject *args)
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/* Calculate and return the address of the PyObject as the value of
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the builtin __hash__ call. */
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-static long
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+static Py_hash_t
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valpy_hash (PyObject *self)
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{
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- return (long) (intptr_t) self;
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+ return (intptr_t) self;
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}
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enum valpy_opcode
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