diff options
Diffstat (limited to 'import-layers/yocto-poky/meta/recipes-devtools/elfutils/elfutils-0.166/0001-Add-GCC7-Wimplicit-fallthrough-support-fixes.patch')
| -rw-r--r-- | import-layers/yocto-poky/meta/recipes-devtools/elfutils/elfutils-0.166/0001-Add-GCC7-Wimplicit-fallthrough-support-fixes.patch | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/import-layers/yocto-poky/meta/recipes-devtools/elfutils/elfutils-0.166/0001-Add-GCC7-Wimplicit-fallthrough-support-fixes.patch b/import-layers/yocto-poky/meta/recipes-devtools/elfutils/elfutils-0.166/0001-Add-GCC7-Wimplicit-fallthrough-support-fixes.patch new file mode 100644 index 000000000..a240323f3 --- /dev/null +++ b/import-layers/yocto-poky/meta/recipes-devtools/elfutils/elfutils-0.166/0001-Add-GCC7-Wimplicit-fallthrough-support-fixes.patch @@ -0,0 +1,318 @@ +From 09949994e76eea3c1230a5c88ffa8fdf588b120f Mon Sep 17 00:00:00 2001 +From: Mark Wielaard <mjw@redhat.com> +Date: Wed, 2 Nov 2016 13:29:26 +0100 +Subject: [PATCH] Add GCC7 -Wimplicit-fallthrough support/fixes. + +GCC7 will have a new -Wimplicit-fallthrough warning. It did catch one +small buglet in elflint option procession. So it seems useful to enable +to make sure all swatch case fallthroughs are deliberate. + +Add configure check to detect whether gcc support -Wimplicit-fallthrough +and enable it. Add fixes and explicit fallthrough comments where necessary. + +Signed-off-by: Mark Wielaard <mjw@redhat.com> + +Upstream-Status: Backport +Upstream-Commit: a3cc8182b2ae05290b0eafa74b70746d7befc0e4 +--- + backends/alpha_retval.c | 4 +--- + backends/i386_regs.c | 1 + + backends/i386_retval.c | 3 +-- + backends/linux-core-note.c | 4 ++-- + backends/ppc_regs.c | 2 +- + backends/x86_64_regs.c | 1 + + config/eu.am | 8 +++++++- + configure.ac | 10 ++++++++++ + libcpu/i386_disasm.c | 2 +- + libdw/cfi.c | 2 ++ + libdw/encoded-value.h | 1 + + libdwfl/dwfl_report_elf.c | 2 +- + src/addr2line.c | 1 + + src/elfcompress.c | 3 ++- + src/elflint.c | 4 +++- + src/objdump.c | 4 +++- + tests/backtrace-data.c | 1 + + tests/backtrace.c | 2 +- + 18 files changed, 40 insertions(+), 15 deletions(-) + +diff --git a/backends/alpha_retval.c b/backends/alpha_retval.c +index 53dbfa45..7232b462 100644 +--- a/backends/alpha_retval.c ++++ b/backends/alpha_retval.c +@@ -130,9 +130,7 @@ alpha_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp) + return nloc_intreg; + } + } +- +- /* Else fall through. */ +- ++ /* Fallthrough */ + case DW_TAG_structure_type: + case DW_TAG_class_type: + case DW_TAG_union_type: +diff --git a/backends/i386_regs.c b/backends/i386_regs.c +index fb8ded33..fd963a62 100644 +--- a/backends/i386_regs.c ++++ b/backends/i386_regs.c +@@ -92,6 +92,7 @@ i386_register_info (Ebl *ebl __attribute__ ((unused)), + case 5: + case 8: + *type = DW_ATE_address; ++ /* Fallthrough */ + case 0 ... 3: + case 6 ... 7: + name[0] = 'e'; +diff --git a/backends/i386_retval.c b/backends/i386_retval.c +index 9da797d5..4aa646fe 100644 +--- a/backends/i386_retval.c ++++ b/backends/i386_retval.c +@@ -122,9 +122,8 @@ i386_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp) + return nloc_intreg; + if (size <= 8) + return nloc_intregpair; +- +- /* Else fall through. */ + } ++ /* Fallthrough */ + + case DW_TAG_structure_type: + case DW_TAG_class_type: +diff --git a/backends/linux-core-note.c b/backends/linux-core-note.c +index ff2b226f..321721f3 100644 +--- a/backends/linux-core-note.c ++++ b/backends/linux-core-note.c +@@ -219,8 +219,8 @@ EBLHOOK(core_note) (const GElf_Nhdr *nhdr, const char *name, + case sizeof "CORE": + if (memcmp (name, "CORE", nhdr->n_namesz) == 0) + break; +- /* Buggy old Linux kernels didn't terminate "LINUX". +- Fall through. */ ++ /* Buggy old Linux kernels didn't terminate "LINUX". */ ++ /* Fall through. */ + + case sizeof "LINUX": + if (memcmp (name, "LINUX", nhdr->n_namesz) == 0) +diff --git a/backends/ppc_regs.c b/backends/ppc_regs.c +index 4b92a9aa..bcf4f7a3 100644 +--- a/backends/ppc_regs.c ++++ b/backends/ppc_regs.c +@@ -140,7 +140,7 @@ ppc_register_info (Ebl *ebl __attribute__ ((unused)), + case 100: + if (*bits == 32) + return stpcpy (name, "mq") + 1 - name; +- ++ /* Fallthrough */ + case 102 ... 107: + name[0] = 's'; + name[1] = 'p'; +diff --git a/backends/x86_64_regs.c b/backends/x86_64_regs.c +index 2172d9f1..84304407 100644 +--- a/backends/x86_64_regs.c ++++ b/backends/x86_64_regs.c +@@ -87,6 +87,7 @@ x86_64_register_info (Ebl *ebl __attribute__ ((unused)), + + case 6 ... 7: + *type = DW_ATE_address; ++ /* Fallthrough */ + case 0 ... 5: + name[0] = 'r'; + name[1] = baseregs[regno][0]; +diff --git a/config/eu.am b/config/eu.am +index 4998771d..8fe1e259 100644 +--- a/config/eu.am ++++ b/config/eu.am +@@ -61,10 +61,16 @@ else + NULL_DEREFERENCE_WARNING= + endif + ++if HAVE_IMPLICIT_FALLTHROUGH_WARNING ++IMPLICIT_FALLTHROUGH_WARNING=-Wimplicit-fallthrough ++else ++IMPLICIT_FALLTHROUGH_WARNING= ++endif ++ + AM_CFLAGS = -std=gnu99 -Wall -Wshadow -Wformat=2 \ + -Wold-style-definition -Wstrict-prototypes \ + $(LOGICAL_OP_WARNING) $(DUPLICATED_COND_WARNING) \ +- $(NULL_DEREFERENCE_WARNING) \ ++ $(NULL_DEREFERENCE_WARNING) $(IMPLICIT_FALLTHROUGH_WARNING) \ + $(if $($(*F)_no_Werror),,-Werror) \ + $(if $($(*F)_no_Wunused),,-Wunused -Wextra) \ + $(if $($(*F)_no_Wstack_usage),,$(STACK_USAGE_WARNING)) \ +diff --git a/configure.ac b/configure.ac +index 86a69c66..35850c64 100644 +--- a/configure.ac ++++ b/configure.ac +@@ -336,6 +336,16 @@ CFLAGS="$old_CFLAGS"]) + AM_CONDITIONAL(HAVE_NULL_DEREFERENCE_WARNING, + [test "x$ac_cv_null_dereference" != "xno"]) + ++# -Wimplicit-fallthrough was added by GCC7 ++AC_CACHE_CHECK([whether gcc accepts -Wimplicit-fallthrough], ac_cv_implicit_fallthrough, [dnl ++old_CFLAGS="$CFLAGS" ++CFLAGS="$CFLAGS -Wimplicit-fallthrough -Werror" ++AC_COMPILE_IFELSE([AC_LANG_SOURCE([])], ++ ac_cv_implicit_fallthrough=yes, ac_cv_implicit_fallthrough=no) ++CFLAGS="$old_CFLAGS"]) ++AM_CONDITIONAL(HAVE_IMPLICIT_FALLTHROUGH_WARNING, ++ [test "x$ac_cv_implicit_fallthrough" != "xno"]) ++ + dnl Check if we have argp available from our libc + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( +diff --git a/libcpu/i386_disasm.c b/libcpu/i386_disasm.c +index 832241f2..1a584635 100644 +--- a/libcpu/i386_disasm.c ++++ b/libcpu/i386_disasm.c +@@ -819,7 +819,7 @@ i386_disasm (const uint8_t **startp, const uint8_t *end, GElf_Addr addr, + ++param_start; + break; + } +- ++ /* Fallthrough */ + default: + assert (! "INVALID not handled"); + } +diff --git a/libdw/cfi.c b/libdw/cfi.c +index 1fd668d7..daa845f3 100644 +--- a/libdw/cfi.c ++++ b/libdw/cfi.c +@@ -138,6 +138,7 @@ execute_cfi (Dwarf_CFI *cache, + + case DW_CFA_advance_loc1: + operand = *program++; ++ /* Fallthrough */ + case DW_CFA_advance_loc + 0 ... DW_CFA_advance_loc + CFI_PRIMARY_MAX: + advance_loc: + loc += operand * cie->code_alignment_factor; +@@ -300,6 +301,7 @@ execute_cfi (Dwarf_CFI *cache, + + case DW_CFA_restore_extended: + get_uleb128 (operand, program, end); ++ /* Fallthrough */ + case DW_CFA_restore + 0 ... DW_CFA_restore + CFI_PRIMARY_MAX: + + if (unlikely (abi_cfi) && likely (opcode == DW_CFA_restore)) +diff --git a/libdw/encoded-value.h b/libdw/encoded-value.h +index 48d868fb..f0df4cec 100644 +--- a/libdw/encoded-value.h ++++ b/libdw/encoded-value.h +@@ -64,6 +64,7 @@ encoded_value_size (const Elf_Data *data, const unsigned char e_ident[], + if (*end++ & 0x80u) + return end - p; + } ++ return 0; + + default: + return 0; +diff --git a/libdwfl/dwfl_report_elf.c b/libdwfl/dwfl_report_elf.c +index 1c6e401d..73a5511a 100644 +--- a/libdwfl/dwfl_report_elf.c ++++ b/libdwfl/dwfl_report_elf.c +@@ -170,7 +170,7 @@ __libdwfl_elf_address_range (Elf *elf, GElf_Addr base, bool add_p_vaddr, + /* An assigned base address is meaningless for these. */ + base = 0; + add_p_vaddr = true; +- ++ /* Fallthrough. */ + case ET_DYN: + default:; + size_t phnum; +diff --git a/src/addr2line.c b/src/addr2line.c +index 0ce854f6..bea24aea 100644 +--- a/src/addr2line.c ++++ b/src/addr2line.c +@@ -632,6 +632,7 @@ handle_address (const char *string, Dwfl *dwfl) + case 1: + addr = 0; + j = i; ++ /* Fallthrough */ + case 2: + if (string[j] != '\0') + break; +diff --git a/src/elfcompress.c b/src/elfcompress.c +index d0ca469c..57afa116 100644 +--- a/src/elfcompress.c ++++ b/src/elfcompress.c +@@ -153,7 +153,8 @@ parse_opt (int key, char *arg __attribute__ ((unused)), + argp_error (state, + N_("Only one input file allowed together with '-o'")); + /* We only use this for checking the number of arguments, we don't +- actually want to consume them, so fallthrough. */ ++ actually want to consume them. */ ++ /* Fallthrough */ + default: + return ARGP_ERR_UNKNOWN; + } +diff --git a/src/elflint.c b/src/elflint.c +index 15b12f6f..2c45fcb8 100644 +--- a/src/elflint.c ++++ b/src/elflint.c +@@ -210,6 +210,7 @@ parse_opt (int key, char *arg __attribute__ ((unused)), + + case 'd': + is_debuginfo = true; ++ break; + + case ARGP_gnuld: + gnuld = true; +@@ -3963,6 +3964,7 @@ section [%2zu] '%s': merge flag set but entry size is zero\n"), + case SHT_NOBITS: + if (is_debuginfo) + break; ++ /* Fallthrough */ + default: + ERROR (gettext ("\ + section [%2zu] '%s' has unexpected type %d for an executable section\n"), +@@ -4305,7 +4307,7 @@ section [%2d] '%s': unknown core file note type %" PRIu32 + if (nhdr.n_namesz == sizeof "Linux" + && !memcmp (data->d_buf + name_offset, "Linux", sizeof "Linux")) + break; +- ++ /* Fallthrough */ + default: + if (shndx == 0) + ERROR (gettext ("\ +diff --git a/src/objdump.c b/src/objdump.c +index 0aa41e89..94e9e021 100644 +--- a/src/objdump.c ++++ b/src/objdump.c +@@ -234,7 +234,9 @@ parse_opt (int key, char *arg, + program_invocation_short_name); + exit (EXIT_FAILURE); + } +- ++ /* We only use this for checking the number of arguments, we don't ++ actually want to consume them. */ ++ /* Fallthrough */ + default: + return ARGP_ERR_UNKNOWN; + } +diff --git a/tests/backtrace-data.c b/tests/backtrace-data.c +index bc5ceba0..b7158dae 100644 +--- a/tests/backtrace-data.c ++++ b/tests/backtrace-data.c +@@ -250,6 +250,7 @@ thread_callback (Dwfl_Thread *thread, void *thread_arg __attribute__ ((unused))) + break; + case -1: + error (1, 0, "dwfl_thread_getframes: %s", dwfl_errmsg (-1)); ++ break; + default: + abort (); + } +diff --git a/tests/backtrace.c b/tests/backtrace.c +index 12476430..bf5995b4 100644 +--- a/tests/backtrace.c ++++ b/tests/backtrace.c +@@ -123,7 +123,7 @@ callback_verify (pid_t tid, unsigned frameno, Dwarf_Addr pc, + assert (symname2 == NULL || strcmp (symname2, "jmp") != 0); + break; + } +- /* PASSTHRU */ ++ /* FALLTHRU */ + case 4: + assert (symname != NULL && strcmp (symname, "stdarg") == 0); + break; +-- +2.13.0 + |
