[PATCH 0/3] Fix several build failures

[PATCH v2 0/3] Update to gdb-16.2

Re: [PATCH 0/5] Update to gdb-16.2

Lianbo Jiang

Friday, 24 January 2025 Fri, 24 Jan '25

4:37 a.m.

The patchset includes three patches: [1] [PATCH 1/3] Fix build failure in readline lib [2] [PATCH 2/3] tools.c: do not use keywords 'nullptr' as a variable in code [3] [PATCH 3/3] Fix build failure on 32bit machine(i686) Lianbo Jiang (3): Fix build failure in readline lib tools.c: do not use keywords 'nullptr' as a variable in code Fix build failure on 32bit machine(i686) gdb-10.2.patch | 88 +++++++++++++++++++++++++++++++++++++++++++++++-- gdb_interface.c | 4 +-- tools.c | 6 ++-- 3 files changed, 90 insertions(+), 8 deletions(-) -- 2.47.1

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Lianbo Jiang

Friday, 24 January Fri, 24 Jan

4:37 a.m.

New subject: [PATCH 1/3] Fix build failure in readline lib

This is a backported patch from gdb upstream, see the commit 425f843d58c5 ("Import GNU Readline 8.2"), and only backported patch related to compilation errors. Without the patch: signals.c: In function ‘_rl_handle_signal’: signals.c:62:36: error: ‘return’ with a value, in function returning void [-Wreturn-mismatch] 62 | # define SIGHANDLER_RETURN return (0) | ^ signals.c:290:3: note: in expansion of macro ‘SIGHANDLER_RETURN’ 290 | SIGHANDLER_RETURN; | ^~~~~~~~~~~~~~~~~ signals.c:178:1: note: declared here 178 | _rl_handle_signal (int sig) | ^~~~~~~~~~~~~~~~~ signals.c: In function ‘rl_sigwinch_handler’: signals.c:306:32: error: passing argument 2 of ‘rl_set_sighandler’ from incompatible pointer type [-Wincompatible-pointer-types] 306 | rl_set_sighandler (SIGWINCH, rl_sigwinch_handler, &dummy_winch); | ^~~~~~~~~~~~~~~~~~~ | | | void (*)(int) In file included from rldefs.h:31, from signals.c:37: signals.c:81:51: note: expected ‘void (*)(void)’ but argument is of type ‘void (*)(int)’ 81 | static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *)); Note: the current build failure was observed on gcc (GCC) 15.0.0. Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com> --- gdb-10.2.patch | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) diff --git a/gdb-10.2.patch b/gdb-10.2.patch index fd6fadb92f39..8f5d7db22840 100644 --- a/gdb-10.2.patch +++ b/gdb-10.2.patch @@ -16239,3 +16239,85 @@ exit 0 pc_p = true; } catch (const gdb_exception_error &ex) +--- gdb-10.2/readline/readline/signals.c.orig ++++ gdb-10.2/readline/readline/signals.c +@@ -48,23 +48,11 @@ + + #if defined (HANDLE_SIGNALS) + +-#if !defined (RETSIGTYPE) +-# if defined (VOID_SIGHANDLER) +-# define RETSIGTYPE void +-# else +-# define RETSIGTYPE int +-# endif /* !VOID_SIGHANDLER */ +-#endif /* !RETSIGTYPE */ +- +-#if defined (VOID_SIGHANDLER) +-# define SIGHANDLER_RETURN return +-#else +-# define SIGHANDLER_RETURN return (0) +-#endif ++#define SIGHANDLER_RETURN return + + /* This typedef is equivalent to the one for Function; it allows us + to say SigHandler *foo = signal (SIGKILL, SIG_IGN); */ +-typedef RETSIGTYPE SigHandler (); ++typedef void SigHandler (int); + + #if defined (HAVE_POSIX_SIGNALS) + typedef struct sigaction sighandler_cxt; +@@ -78,12 +66,12 @@ typedef struct { SigHandler *sa_handler; int sa_mask, sa_flags; } sighandler_cxt + # define SA_RESTART 0 + #endif + +-static SigHandler *rl_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *)); +-static void rl_maybe_set_sighandler PARAMS((int, SigHandler *, sighandler_cxt *)); +-static void rl_maybe_restore_sighandler PARAMS((int, sighandler_cxt *)); ++static SigHandler *rl_set_sighandler (int, SigHandler *, sighandler_cxt *); ++static void rl_maybe_set_sighandler (int, SigHandler *, sighandler_cxt *); ++static void rl_maybe_restore_sighandler (int, sighandler_cxt *); + +-static RETSIGTYPE rl_signal_handler PARAMS((int)); +-static RETSIGTYPE _rl_handle_signal PARAMS((int)); ++static void rl_signal_handler (int); ++static void _rl_handle_signal (int); + + /* Exported variables for use by applications. */ + +@@ -137,7 +125,7 @@ void *_rl_sigcleanarg; + /* Readline signal handler functions. */ + + /* Called from RL_CHECK_SIGNALS() macro */ +-RETSIGTYPE ++void + _rl_signal_handler (int sig) + { + _rl_caught_signal = 0; /* XXX */ +@@ -160,7 +148,7 @@ _rl_signal_handler (int sig) + SIGHANDLER_RETURN; + } + +-static RETSIGTYPE ++static void + rl_signal_handler (int sig) + { + if (_rl_interrupt_immediately) +@@ -174,7 +162,7 @@ rl_signal_handler (int sig) + SIGHANDLER_RETURN; + } + +-static RETSIGTYPE ++static void + _rl_handle_signal (int sig) + { + #if defined (HAVE_POSIX_SIGNALS) +@@ -291,7 +279,7 @@ _rl_handle_signal (int sig) + } + + #if defined (SIGWINCH) +-static RETSIGTYPE ++static void + rl_sigwinch_handler (int sig) + { + SigHandler *oh; -- 2.47.1

Lianbo Jiang

4:38 a.m.

New subject: [PATCH 2/3] tools.c: do not use keywords 'nullptr' as a variable in code

Without the patch: tools.c: In function ‘drop_core’: tools.c:6251:23: error: expected identifier or ‘(’ before ‘nullptr’ 6251 | volatile int *nullptr; | ^~~~~~~ tools.c:6259:17: error: lvalue required as left operand of assignment 6259 | nullptr = NULL; | ^ tools.c:6261:21: error: invalid type argument of unary ‘*’ (have ‘typeof (nullptr)’) 6261 | i = *nullptr; | ^~~~~~~~ make[6]: *** [Makefile:345: tools.o] Error 1 Note: this was observed on gcc version 15.0.1 Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com> --- tools.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/tools.c b/tools.c index 85d8b6f0b630..c9305bef7c9c 100644 --- a/tools.c +++ b/tools.c @@ -6248,7 +6248,7 @@ lowest_bit_long(ulong val) void drop_core(char *s) { - volatile int *nullptr; + volatile int *ptr; int i ATTRIBUTE_UNUSED; if (s && ascii_string(s)) @@ -6256,9 +6256,9 @@ drop_core(char *s) kill((pid_t)pc->program_pid, 3); - nullptr = NULL; + ptr = NULL; while (TRUE) - i = *nullptr; + i = *ptr; } -- 2.47.1

Lianbo Jiang

4:38 a.m.

New subject: [PATCH 3/3] Fix build failure on 32bit machine(i686)

This issue was caused by commit 0f39e33d3504 with the following compilation error: frame.c: In function ‘CORE_ADDR frame_unwind_pc(frame_info*)’: frame.c:982:35: error: cannot convert ‘CORE_ADDR*’ {aka ‘long long unsigned int*’} to ‘ulong*’ {aka ‘long unsigned int*’} 982 | crash_decode_ptrauth_pc(&pc); | ^~~ | | | CORE_ADDR* {aka long long unsigned int*} frame.c:948:48: note: initializing argument 1 of ‘void crash_decode_ptrauth_pc(ulong*)’ 948 | extern "C" void crash_decode_ptrauth_pc(ulong* pc); | ~~~~~~~^~ Fixes: 0f39e33d3504 ("arm64: add pac mask to better support gdb stack unwind") Reported-by: Guanyou.Chen <chenguanyou(a)xiaomi.com> Signed-off-by: Lianbo Jiang <lijiang(a)redhat.com> --- gdb-10.2.patch | 6 +++--- gdb_interface.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/gdb-10.2.patch b/gdb-10.2.patch index 8f5d7db22840..156df2ed78b5 100644 --- a/gdb-10.2.patch +++ b/gdb-10.2.patch @@ -55,7 +55,7 @@ exit 0 # your system doesn't have fcntl.h in /usr/include (which is where it # should be according to Posix). -DEFS = @DEFS@ -+DEFS = -DCRASH_MERGE @DEFS@ ++DEFS = -DCRASH_MERGE -DTARGET_${CRASH_TARGET} @DEFS@ GDB_CFLAGS = -I. -I$(srcdir) -I$(srcdir)/config \ -DLOCALEDIR="\"$(localedir)\"" $(DEFS) @@ -16222,7 +16222,7 @@ exit 0 return NULL; } -+#ifdef CRASH_MERGE ++#if defined(CRASH_MERGE) && defined(ARM64) +extern "C" void crash_decode_ptrauth_pc(ulong* pc); +#endif + @@ -16233,7 +16233,7 @@ exit 0 try { pc = gdbarch_unwind_pc (prev_gdbarch, this_frame); -+#ifdef CRASH_MERGE ++#if defined(CRASH_MERGE) && defined(ARM64) + crash_decode_ptrauth_pc(&pc); +#endif pc_p = true; diff --git a/gdb_interface.c b/gdb_interface.c index e108d097ee5f..c2e99f5c156a 100644 --- a/gdb_interface.c +++ b/gdb_interface.c @@ -1084,12 +1084,12 @@ int crash_get_current_task_reg (int regno, const char *regname, } /* arm64 kernel lr maybe has patuh */ +#ifdef ARM64 void crash_decode_ptrauth_pc(ulong *pc); void crash_decode_ptrauth_pc(ulong *pc) { -#ifdef ARM64 struct machine_specific *ms = machdep->machspec; if (is_kernel_text(*pc | ms->CONFIG_ARM64_KERNELPACMASK)) *pc |= ms->CONFIG_ARM64_KERNELPACMASK; -#endif /* !ARM64 */ } +#endif /* !ARM64 */ -- 2.47.1

lijiang

Saturday, 25 January Sat, 25 Jan

7:26 p.m.

New subject: [PATCH 3/3] Fix build failure on 32bit machine(i686)

On Fri, Jan 24, 2025 at 6:38 PM Lianbo Jiang <lijiang(a)redhat.com> wrote:

...

Sorry, It should be: +DEFS = -DCRASH_MERGE -D${CRASH_TARGET} @DEFS@ Thanks Lianbo

...

GDB_CFLAGS = -I. -I$(srcdir) -I$(srcdir)/config \ -DLOCALEDIR="\"$(localedir)\"" $(DEFS) @@ -16222,7 +16222,7 @@ exit 0 return NULL; } -+#ifdef CRASH_MERGE ++#if defined(CRASH_MERGE) && defined(ARM64) +extern "C" void crash_decode_ptrauth_pc(ulong* pc); +#endif + @@ -16233,7 +16233,7 @@ exit 0 try { pc = gdbarch_unwind_pc (prev_gdbarch, this_frame); -+#ifdef CRASH_MERGE ++#if defined(CRASH_MERGE) && defined(ARM64) + crash_decode_ptrauth_pc(&pc); +#endif pc_p = true; diff --git a/gdb_interface.c b/gdb_interface.c index e108d097ee5f..c2e99f5c156a 100644 --- a/gdb_interface.c +++ b/gdb_interface.c @@ -1084,12 +1084,12 @@ int crash_get_current_task_reg (int regno, const char *regname, } /* arm64 kernel lr maybe has patuh */ +#ifdef ARM64 void crash_decode_ptrauth_pc(ulong *pc); void crash_decode_ptrauth_pc(ulong *pc) { -#ifdef ARM64 struct machine_specific *ms = machdep->machspec; if (is_kernel_text(*pc | ms->CONFIG_ARM64_KERNELPACMASK)) *pc |= ms->CONFIG_ARM64_KERNELPACMASK; -#endif /* !ARM64 */ } +#endif /* !ARM64 */ -- 2.47.1

Tao Liu

Sunday, 26 January Sun, 26 Jan

5:59 a.m.

Hi Lianbo, Thanks for the fix, I will take a look into the series shortly. Thanks, Tao Liu On Fri, Jan 24, 2025 at 11:38 PM Lianbo Jiang <lijiang(a)redhat.com> wrote:

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Tao Liu

Tuesday, 4 February Tue, 4 Feb

3:32 a.m.

Hi Lianbo, Please checkout the "Update to gdb-16.2" patchset [1], which I have integrated this patchset into that one. Since the No1 patch is no longer needed after the gdb upgrade, in addition, the No3 patch also made some modification on gdb-10.2.patch, which is removed after the upgrade. All in all, the patchset looks good to me, so we can discuss it there. Thanks, Tao Liu [1]: https://www.mail-archive.com/devel@lists.crash-utility.osci.io/msg01347.html On Mon, Jan 27, 2025 at 12:59 AM Tao Liu <ltao(a)redhat.com> wrote:

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Hi Lianbo, Thanks for the fix, I will take a look into the series shortly. Thanks, Tao Liu On Fri, Jan 24, 2025 at 11:38 PM Lianbo Jiang <lijiang(a)redhat.com> wrote: > > The patchset includes three patches: > [1] [PATCH 1/3] Fix build failure in readline lib > [2] [PATCH 2/3] tools.c: do not use keywords 'nullptr' as a variable in code > [3] [PATCH 3/3] Fix build failure on 32bit machine(i686) > > Lianbo Jiang (3): > Fix build failure in readline lib > tools.c: do not use keywords 'nullptr' as a variable in code > Fix build failure on 32bit machine(i686) > > gdb-10.2.patch | 88 +++++++++++++++++++++++++++++++++++++++++++++++-- > gdb_interface.c | 4 +-- > tools.c | 6 ++-- > 3 files changed, 90 insertions(+), 8 deletions(-) > > -- > 2.47.1 >

Tao Liu

Wednesday, 5 February Wed, 5 Feb

2:39 a.m.

Hi Lianbo, As we discussed, let's go with the separated patchsets of gdb 16.2 and this one. I will post another gdb 16.2 update patchset. As for this patchset, LGTM, so ack. Thanks, Tao Liu On Fri, Jan 24, 2025 at 11:38 PM Lianbo Jiang <lijiang(a)redhat.com> wrote:

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lijiang

4:16 a.m.

On Wed, Feb 5, 2025 at 4:40 PM Tao Liu <ltao(a)redhat.com> wrote:

...

Hi Lianbo, As we discussed, let's go with the separated patchsets of gdb 16.2 and this one. I will post another gdb 16.2 update patchset. As for this

Ok, Thanks Tao.

...

patchset, LGTM, so ack.

Applied: [1] https://github.com/crash-utility/crash/commit/772fbb1022911410b5fb773fde3... [2] https://github.com/crash-utility/crash/commit/325a9d1b3b4ce76bf4556235c88... [3] https://github.com/crash-utility/crash/commit/2724bb1d0260f3886f8a3d53383... Lianbo

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Thanks, Tao Liu On Fri, Jan 24, 2025 at 11:38 PM Lianbo Jiang <lijiang(a)redhat.com> wrote: > > The patchset includes three patches: > [1] [PATCH 1/3] Fix build failure in readline lib > [2] [PATCH 2/3] tools.c: do not use keywords 'nullptr' as a variable in code > [3] [PATCH 3/3] Fix build failure on 32bit machine(i686) > > Lianbo Jiang (3): > Fix build failure in readline lib > tools.c: do not use keywords 'nullptr' as a variable in code > Fix build failure on 32bit machine(i686) > > gdb-10.2.patch | 88 +++++++++++++++++++++++++++++++++++++++++++++++-- > gdb_interface.c | 4 +-- > tools.c | 6 ++-- > 3 files changed, 90 insertions(+), 8 deletions(-) > > -- > 2.47.1 >

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[PATCH 0/3] Fix several build failures