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* [binutils-gdb] gdb/python/python-internal.h: avoid uninitialized constexpr
@ 2024-06-19 14:27 Lancelot SIX
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From: Lancelot SIX @ 2024-06-19 14:27 UTC (permalink / raw)
To: gdb-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ea4e03c0a9f5ed8574dcaa434cd979a6f92f5c1f
commit ea4e03c0a9f5ed8574dcaa434cd979a6f92f5c1f
Author: Lancelot SIX <lancelot.six@amd.com>
Date: Tue Jun 18 09:29:14 2024 +0100
gdb/python/python-internal.h: avoid uninitialized constexpr
The following recent change introduced a regression when building using
clang++:
commit 764af878259768bb70c65bdf3f3285c2d6409bbd
Date: Wed Jun 12 18:58:49 2024 +0200
[gdb/python] Add typesafe wrapper around PyObject_CallMethod
The error message is:
../../gdb/python/python-internal.h:151:16: error: default initialization of an object of const type 'const char'
constexpr char gdbpy_method_format;
^
= '\0'
CXX python/py-block.o
1 error generated.
make[2]: *** [Makefile:1959: python/py-arch.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from ../../gdb/python/py-auto-load.c:25:
../../gdb/python/python-internal.h:151:16: error: default initialization of an object of const type 'const char'
constexpr char gdbpy_method_format;
^
= '\0'
1 error generated.
make[2]: *** [Makefile:1959: python/py-auto-load.o] Error 1
In file included from ../../gdb/python/py-block.c:23:
../../gdb/python/python-internal.h:151:16: error: default initialization of an object of const type 'const char'
constexpr char gdbpy_method_format;
^
= '\0'
1 error generated.
This patch fixes this by changing gdbpy_method_format to be a templated
struct, and only have its specializations define the static constexpr
member "format". This way, we avoid having an uninitialized constexpr
expression, regardless of it being instantiated or not.
Reviewed-By: Tom de Vries <tdevries@suse.de>
Change-Id: I5bec241144f13500ef78daea30f00d01e373692d
Diff:
---
gdb/python/python-internal.h | 24 ++++++++++++++++++------
1 file changed, 18 insertions(+), 6 deletions(-)
diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h
index f4c35babe46..fec0010a444 100644
--- a/gdb/python/python-internal.h
+++ b/gdb/python/python-internal.h
@@ -148,19 +148,31 @@ typedef long Py_hash_t;
/* A template variable holding the format character (as for
Py_BuildValue) for a given type. */
template<typename T>
-constexpr char gdbpy_method_format;
+struct gdbpy_method_format {};
template<>
-constexpr char gdbpy_method_format<gdb_py_longest> = GDB_PY_LL_ARG[0];
+struct gdbpy_method_format<gdb_py_longest>
+{
+ static constexpr char format = GDB_PY_LL_ARG[0];
+};
template<>
-constexpr char gdbpy_method_format<gdb_py_ulongest> = GDB_PY_LLU_ARG[0];
+struct gdbpy_method_format<gdb_py_ulongest>
+{
+ static constexpr char format = GDB_PY_LLU_ARG[0];
+};
template<>
-constexpr char gdbpy_method_format<int> = 'i';
+struct gdbpy_method_format<int>
+{
+ static constexpr char format = 'i';
+};
template<>
-constexpr char gdbpy_method_format<unsigned> = 'I';
+struct gdbpy_method_format<unsigned>
+{
+ static constexpr char format = 'I';
+};
/* A helper function to compute the PyObject_CallMethod /
Py_BuildValue format given the argument types. */
@@ -169,7 +181,7 @@ template<typename... Args>
constexpr std::array<char, sizeof... (Args) + 1>
gdbpy_make_fmt ()
{
- return { gdbpy_method_format<Args>..., '\0' };
+ return { gdbpy_method_format<Args>::format..., '\0' };
}
/* Typesafe wrapper around PyObject_CallMethod.
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2024-06-19 14:27 [binutils-gdb] gdb/python/python-internal.h: avoid uninitialized constexpr Lancelot SIX
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