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devel/gdb: fix build with clang 16
Clang 16 has a new error about integer values being outside the valid
range for enum types, which shows up when building gdb:
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/x86-fbsd-nat.c:20:
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/defs.h:65:
/wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
^
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/x86-bsd-nat.c:20:
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/defs.h:65:
/wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
^
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/x86-nat.c:20:
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/defs.h:65:
/wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
^
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/windows-tdep.c:18:
In file included from /wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/defs.h:65:
/wrkdirs/usr/ports/devel/gdb/work-py39/gdb-13.1/gdb/../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
^
Upstream already noticed this, and committed
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ae61525fcf4 as
a workaround, so add this as an additional patch, until gdb 13.2 is
released.
PR: 271045
Approved by: maintainer timeout (2 weeks)
MFH: 2023Q2
This commit is contained in:
Dimitry Andric
parent
9d2bf7ac7f
commit
9e765fe77d
2 changed files with 130 additions and 1 deletions
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@ -1,6 +1,6 @@
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PORTNAME= gdb
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DISTVERSION= 13.1
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PORTREVISION= 1
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PORTREVISION= 2
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CATEGORIES= devel
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MASTER_SITES= GNU
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@ -36,6 +36,7 @@ CFLAGS+= -DRL_NO_COMPAT
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EXCLUDE= dejagnu expect sim texinfo intl
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EXTRACT_AFTER_ARGS= ${EXCLUDE:S/^/--exclude /}
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EXTRA_PATCHES= ${FILESDIR}/commit-a980a7d24b9
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EXTRA_PATCHES+= ${FILESDIR}/commit-ae61525fcf4
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VER= ${DISTVERSION:S/.//g}
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PLIST_SUB= VER=${VER}
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128
devel/gdb/files/commit-ae61525fcf4
Normal file
128
devel/gdb/files/commit-ae61525fcf4
Normal file
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@ -0,0 +1,128 @@
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commit ae61525fcf456ab395d55c45492a106d1275873a
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Author: Simon Marchi <simon.marchi@efficios.com>
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Date: 2023-02-23 12:35:40 -0500
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gdbsupport: ignore -Wenum-constexpr-conversion in enum-flags.h
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When building with clang 16, we get:
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CXX gdb.o
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In file included from /home/smarchi/src/binutils-gdb/gdb/gdb.c:19:
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In file included from /home/smarchi/src/binutils-gdb/gdb/defs.h:65:
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/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/enum-flags.h:95:52: error: integer value -1 is outside the valid range of values [0, 15] for this enumeration type [-Wenum-constexpr-conversion]
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integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
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^
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The error message does not make it clear in the context of which enum
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flag this fails (i.e. what is T in this context), but it doesn't really
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matter, we have similar warning/errors for many of them, if we let the
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build go through.
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clang is right that the value -1 is invalid for the enum type we cast -1
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to. However, we do need this expression in order to select an integer
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type with the appropriate signedness. That is, with the same signedness
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as the underlying type of the enum.
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I first wondered if that was really needed, if we couldn't use
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std::underlying_type for that. It turns out that the comment just above
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says:
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/* Note that std::underlying_type<enum_type> is not what we want here,
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since that returns unsigned int even when the enum decays to signed
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int. */
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I was surprised, because std::is_signed<std::underlying_type<enum_type>>
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returns the right thing. So I tried replacing all this with
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std::underlying_type, see if that would work. Doing so causes some
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build failures in unittests/enum-flags-selftests.c:
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CXX unittests/enum-flags-selftests.o
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/home/smarchi/src/binutils-gdb/gdb/unittests/enum-flags-selftests.c:254:1: error: static assertion failed due to requirement 'gdb::is_same<selftests::enum_flags_tests::check_valid_expr254::archetype<enum_flags<s
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elftests::enum_flags_tests::RE>, selftests::enum_flags_tests::RE, enum_flags<selftests::enum_flags_tests::RE2>, selftests::enum_flags_tests::RE2, enum_flags<selftests::enum_flags_tests::URE>, selftests::enum_fla
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gs_tests::URE, int>, selftests::enum_flags_tests::check_valid_expr254::archetype<enum_flags<selftests::enum_flags_tests::RE>, selftests::enum_flags_tests::RE, enum_flags<selftests::enum_flags_tests::RE2>, selfte
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sts::enum_flags_tests::RE2, enum_flags<selftests::enum_flags_tests::URE>, selftests::enum_flags_tests::URE, unsigned int>>::value == true':
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CHECK_VALID (true, int, true ? EF () : EF2 ())
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/home/smarchi/src/binutils-gdb/gdb/unittests/enum-flags-selftests.c:91:3: note: expanded from macro 'CHECK_VALID'
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CHECK_VALID_EXPR_6 (EF, RE, EF2, RE2, UEF, URE, VALID, EXPR_TYPE, EXPR)
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/valid-expr.h:105:3: note: expanded from macro 'CHECK_VALID_EXPR_6'
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CHECK_VALID_EXPR_INT (ESC_PARENS (typename T1, typename T2, \
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^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/home/smarchi/src/binutils-gdb/gdb/../gdbsupport/valid-expr.h:66:3: note: expanded from macro 'CHECK_VALID_EXPR_INT'
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static_assert (gdb::is_detected_exact<archetype<TYPES, EXPR_TYPE>, \
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^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This is a bit hard to decode, but basically enumerations have the
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following funny property that they decay into a signed int, even if
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their implicit underlying type is unsigned. This code:
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enum A {};
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enum B {};
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int main() {
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std::cout << std::is_signed<std::underlying_type<A>::type>::value
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<< std::endl;
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std::cout << std::is_signed<std::underlying_type<B>::type>::value
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<< std::endl;
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auto result = true ? A() : B();
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std::cout << std::is_signed<decltype(result)>::value << std::endl;
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}
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produces:
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0
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0
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1
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So, the "CHECK_VALID" above checks that this property works for enum flags the
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same way as it would if you were using their underlying enum types. And
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somehow, changing integer_for_size to use std::underlying_type breaks that.
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Since the current code does what we want, and I don't see any way of doing it
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differently, ignore -Wenum-constexpr-conversion around it.
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Change-Id: Ibc82ae7bbdb812102ae3f1dd099fc859dc6f3cc2
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diff --git gdbsupport/enum-flags.h gdbsupport/enum-flags.h
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index 700037f6126..41ac7838f06 100644
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--- gdbsupport/enum-flags.h
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+++ gdbsupport/enum-flags.h
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@@ -91,9 +91,12 @@ template<> struct integer_for_size<8, 1> { typedef int64_t type; };
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template<typename T>
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struct enum_underlying_type
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{
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+ DIAGNOSTIC_PUSH
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+ DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION
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typedef typename
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integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
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type;
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+ DIAGNOSTIC_POP
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};
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namespace enum_flags_detail
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diff --git include/diagnostics.h include/diagnostics.h
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index d3ff27bc008..41e6db65391 100644
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--- include/diagnostics.h
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+++ include/diagnostics.h
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@@ -76,6 +76,11 @@
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# define DIAGNOSTIC_ERROR_SWITCH \
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DIAGNOSTIC_ERROR ("-Wswitch")
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+# if __has_warning ("-Wenum-constexpr-conversion")
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+# define DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION \
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+ DIAGNOSTIC_IGNORE ("-Wenum-constexpr-conversion")
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+# endif
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+
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#elif defined (__GNUC__) /* GCC */
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# define DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS \
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@@ -155,4 +160,8 @@
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# define DIAGNOSTIC_ERROR_SWITCH
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#endif
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+#ifndef DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION
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+# define DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION
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+#endif
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+
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#endif /* DIAGNOSTICS_H */
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