开源软件构建与测试

_service:tar_scm:crash.spec Changed

_service:tar_scm:0004-gdbsupport-ignore-Wenum-constexpr-conversion-in-enum.patch Added

@@ -0,0 +1,145 @@
+From 3996ae585fbdf3c620dae5955fc58e05ce8c3493 Mon Sep 17 00:00:00 2001
+From: yanying <201250106@smail.nju.edu.cn>
+Date: Fri, 30 Aug 2024 10:01:35 +0800
+Subject: PATCH gdbsupport: ignore -Wenum-constexpr-conversion in
+ enum-flags.h
+
+When building with clang 16, we get:
+
+      CXX    gdb.o
+    In file included from /home/smarchi/src/binutils-gdb/gdb/gdb.c:19:
+    In file included from /home/smarchi/src/binutils-gdb/gdb/defs.h:65:
+    /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
+        integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
+                                                       ^
+
+The error message does not make it clear in the context of which enum
+flag this fails (i.e. what is T in this context), but it doesn't really
+matter, we have similar warning/errors for many of them, if we let the
+build go through.
+
+clang is right that the value -1 is invalid for the enum type we cast -1
+to.  However, we do need this expression in order to select an integer
+type with the appropriate signedness.  That is, with the same signedness
+as the underlying type of the enum.
+
+I first wondered if that was really needed, if we couldn't use
+std::underlying_type for that.  It turns out that the comment just above
+says:
+
+    /* Note that std::underlying_type<enum_type> is not what we want here,
+       since that returns unsigned int even when the enum decays to signed
+       int.  */
+
+I was surprised, because std::is_signed<std::underlying_type<enum_type>>
+returns the right thing.  So I tried replacing all this with
+std::underlying_type, see if that would work.  Doing so causes some
+build failures in unittests/enum-flags-selftests.c:
+
+      CXX    unittests/enum-flags-selftests.o
+    /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
+    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
+    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
+    sts::enum_flags_tests::RE2, enum_flags<selftests::enum_flags_tests::URE>, selftests::enum_flags_tests::URE, unsigned int>>::value == true':
+    CHECK_VALID (true,  int,  true ? EF () : EF2 ())
+    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    /home/smarchi/src/binutils-gdb/gdb/unittests/enum-flags-selftests.c:91:3: note: expanded from macro 'CHECK_VALID'
+      CHECK_VALID_EXPR_6 (EF, RE, EF2, RE2, UEF, URE, VALID, EXPR_TYPE, EXPR)
+      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    /home/smarchi/src/binutils-gdb/gdb/../gdbsupport/valid-expr.h:105:3: note: expanded from macro 'CHECK_VALID_EXPR_6'
+      CHECK_VALID_EXPR_INT (ESC_PARENS (typename T1, typename T2,           \
+      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+    /home/smarchi/src/binutils-gdb/gdb/../gdbsupport/valid-expr.h:66:3: note: expanded from macro 'CHECK_VALID_EXPR_INT'
+      static_assert (gdb::is_detected_exact<archetype<TYPES, EXPR_TYPE>,    \
+      ^              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This is a bit hard to decode, but basically enumerations have the
+following funny property that they decay into a signed int, even if
+their implicit underlying type is unsigned.  This code:
+
+    enum A {};
+    enum B {};
+
+    int main() {
+      std::cout << std::is_signed<std::underlying_type<A>::type>::value
+                << std::endl;
+      std::cout << std::is_signed<std::underlying_type<B>::type>::value
+                << std::endl;
+      auto result = true ? A() : B();
+      std::cout << std::is_signed<decltype(result)>::value << std::endl;
+    }
+
+produces:
+
+    0
+    0
+    1
+
+So, the "CHECK_VALID" above checks that this property works for enum flags the
+same way as it would if you were using their underlying enum types.  And
+somehow, changing integer_for_size to use std::underlying_type breaks that.
+
+Since the current code does what we want, and I don't see any way of doing it
+differently, ignore -Wenum-constexpr-conversion around it.
+
+Change-Id: Ibc82ae7bbdb812102ae3f1dd099fc859dc6f3cc2
+---
+ gdb-10.2.patch | 44 ++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 44 insertions(+)
+
+diff --git a/gdb-10.2.patch b/gdb-10.2.patch
+index d81030d..ee96c03 100644
+--- a/gdb-10.2.patch
++++ b/gdb-10.2.patch
+@@ -3187,3 +3187,47 @@ exit 0
+        result = stringtab + symbol_entry->_n._n_n._n_offset;
+      }
+    else
++
++--- gdb-10.2/gdbsupport/enum-flags.h.orig
+++++ gdb-10.2/gdbsupport/enum-flags.h
++@@ -81,9 +81,12 @@
++ template<typename T>
++ struct enum_underlying_type
++ {
+++  DIAGNOSTIC_PUSH
+++  DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION
++   typedef typename
++     integer_for_size<sizeof (T), static_cast<bool>(T (-1) < T (0))>::type
++     type;
+++  DIAGNOSTIC_POP
++ };
++
++ template <typename E>
++
++--- gdb-10.2/include/diagnostics.h.orig
+++++ gdb-10.2/include/diagnostics.h
++@@ -61,6 +61,24 @@
++ # define DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL \
++   DIAGNOSTIC_IGNORE ("-Wformat-nonliteral")
++
+++# if __has_warning ("-Wuser-defined-warnings")
+++#  define DIAGNOSTIC_IGNORE_USER_DEFINED_WARNINGS \
+++   DIAGNOSTIC_IGNORE ("-Wuser-defined-warnings")
+++# endif
+++
+++# if __has_warning ("-Wunused-but-set-variable")
+++#  define DIAGNOSTIC_IGNORE_UNUSED_BUT_SET_VARIABLE \
+++   DIAGNOSTIC_IGNORE ("-Wunused-but-set-variable")
+++# endif
+++
+++# define DIAGNOSTIC_ERROR_SWITCH \
+++  DIAGNOSTIC_ERROR ("-Wswitch")
+++
+++# if __has_warning ("-Wenum-constexpr-conversion")
+++#  define DIAGNOSTIC_IGNORE_ENUM_CONSTEXPR_CONVERSION \
+++   DIAGNOSTIC_IGNORE ("-Wenum-constexpr-conversion")
+++# endif
+++
++ #elif defined (__GNUC__) /* GCC */
++
++ # if __GNUC__ >= 7
+\ No newline at end of file
+-- 
+2.43.0
+

_service Changed

Changes of Revision 13