I happened to be build-testing on macOS and found this:
Undefined symbols for architecture x86_64:
"fork_inferior(char const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char**, void (*)(), void (*)(int), void (*)(), char const*, void (*)(char const*, char* const*, char* const*))", referenced from:
darwin_create_inferior(target_ops*, char const*, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&, char**, int) in darwin-nat.o
"startup_inferior(int, int, target_waitstatus*, ptid_t*)", referenced from:
gdb_startup_inferior(int, int) in fork-child.o
"trace_start_error(char const*, ...)", referenced from:
darwin_ptrace_me() in darwin-nat.o
"trace_start_error_with_name(char const*)", referenced from:
darwin_ptrace_me() in darwin-nat.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Adding fork-inferior.o fixes it. I factored out the Darwin bits that
are no architecture-specific in the section meant for that at the top.
I only built-tested this using Travis-CI, since I don't have access to
this platform.
gdb/ChangeLog:
* configure.nat: Factor out Darwin bits that are not
architecture-specific. Add fork-inferior.o.
Trying to build on AIX gives:
ld: 0711-317 ERROR: Undefined symbol: .trace_start_error_with_name(char const*)
ld: 0711-317 ERROR: Undefined symbol: .fork_inferior(char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char**, void (*)(), void (*)(int), void (*)(), char const*, void (*)(char const*, char* const*, char* const*))
ld: 0711-317 ERROR: Undefined symbol: .startup_inferior(int, int, target_waitstatus*, ptid_t*)
Including fork-inferior.o in the build should help. I also factored out
the AIX bits that are not architecture-specific to be consistent with the other
OSes.
gdb/ChangeLog:
* configure.nat: Factor out AIX bits that are not
architecture-specific. Add fork-inferior.o.
This is the most important (and the biggest, sorry) patch of the
series. It moves fork_inferior from gdb/fork-child.c to
nat/fork-inferior.c and makes all the necessary adjustments to both
GDB and gdbserver to make sure everything works OK.
There is no "most important change" with this patch; all changes are
made in a progressive way, making sure that gdbserver had the
necessary features while not breaking GDB at the same time.
I decided to go ahead and implement a partial support for starting the
inferior with a shell on gdbserver, although the full feature comes in
the next patch. The user won't have the option to disable the
startup-with-shell, and also won't be able to change which shell
gdbserver will use (other than setting the $SHELL environment
variable, that is).
Everything is working as expected, and no regressions were present
during the tests.
gdb/ChangeLog:
2017-06-07 Sergio Durigan Junior <sergiodj@redhat.com>
Pedro Alves <palves@redhat.com>
* Makefile.in (HFILES_NO_SRCDIR): Add "common/common-inferior.h"
and "nat/fork-inferior.h".
* common/common-inferior.h: New file, with contents from
"gdb/inferior.h".
* commom/common-utils.c: Include "common-utils.h".
(stringify_argv): New function.
* common/common-utils.h (stringify_argv): New prototype.
* configure.nat: Add "fork-inferior.o" as a dependency for
"*linux*", "fbsd*" and "nbsd*" hosts.
* corefile.c (get_exec_file): Update comment.
* darwin-nat.c (darwin_ptrace_him): Call "gdb_startup_inferior"
instead of "startup_inferior".
(darwin_create_inferior): Call "add_thread_silent" after
"fork_inferior".
* fork-child.c: Cleanup unnecessary includes.
(SHELL_FILE): Move to "common/common-fork-child.c".
(environ): Likewise.
(exec_wrapper): Initialize.
(get_exec_wrapper): New function.
(breakup_args): Move to "common/common-fork-child.c"; rename to
"breakup_args_for_exec".
(escape_bang_in_quoted_argument): Move to
"common/common-fork-child.c".
(saved_ui): New variable.
(prefork_hook): New function.
(postfork_hook): Likewise.
(postfork_child_hook): Likewise.
(gdb_startup_inferior): Likewise.
(fork_inferior): Move to "common/common-fork-child.c". Update
function to support gdbserver.
(startup_inferior): Likewise.
* gdbcore.h (get_exec_file): Remove declaration.
* gnu-nat.c (gnu_create_inferior): Call "gdb_startup_inferior"
instead of "startup_inferior". Call "add_thread_silent" after
"fork_inferior".
* inf-ptrace.c: Include "nat/fork-inferior.h" and "utils.h".
(inf_ptrace_create_inferior): Call "gdb_startup_inferior"
instead of "startup_inferior". Call "add_thread_silent" after
"fork_inferior".
* inferior.h: Include "common-inferior.h".
(trace_start_error): Move to "common/common-utils.h".
(trace_start_error_with_name): Likewise.
(fork_inferior): Move prototype to "nat/fork-inferior.h".
(startup_inferior): Likewise.
(gdb_startup_inferior): New prototype.
* nat/fork-inferior.c: New file, with contents from "fork-child.c".
* nat/fork-inferior.h: New file.
* procfs.c (procfs_init_inferior): Call "gdb_startup_inferior"
instead of "startup_inferior". Call "add_thread_silent" after
"fork_inferior".
* target.h (target_terminal_init): Move prototype to
"target/target.h".
(target_terminal_inferior): Likewise.
(target_terminal_ours): Likewise.
* target/target.h (target_terminal_init): New prototype, moved
from "target.h".
(target_terminal_inferior): Likewise.
(target_terminal_ours): Likewise.
* utils.c (gdb_flush_out_err): New function.
gdb/gdbserver/ChangeLog:
2017-06-07 Sergio Durigan Junior <sergiodj@redhat.com>
Pedro Alves <palves@redhat.com>
* Makefile.in (SFILES): Add "nat/fork-inferior.o".
* configure: Regenerate.
* configure.srv (srv_linux_obj): Add "fork-child.o" and
"fork-inferior.o".
(i[34567]86-*-lynxos*): Likewise.
(spu*-*-*): Likewise.
* fork-child.c: New file.
* linux-low.c: Include "common-inferior.h", "nat/fork-inferior.h"
and "environ.h".
(linux_ptrace_fun): New function.
(linux_create_inferior): Adjust function prototype to reflect
change on "target.h". Adjust function code to use
"fork_inferior".
(linux_request_interrupt): Delete "signal_pid".
* lynx-low.c: Include "common-inferior.h" and "nat/fork-inferior.h".
(lynx_ptrace_fun): New function.
(lynx_create_inferior): Adjust function prototype to reflect
change on "target.h". Adjust function code to use
"fork_inferior".
* nto-low.c (nto_create_inferior): Adjust function prototype and
code to reflect change on "target.h". Update comments.
* server.c: Include "common-inferior.h", "nat/fork-inferior.h",
"common-terminal.h" and "environ.h".
(terminal_fd): Moved to fork-child.c.
(old_foreground_pgrp): Likewise.
(restore_old_foreground_pgrp): Likewise.
(last_status): Make it global.
(last_ptid): Likewise.
(our_environ): New variable.
(startup_with_shell): Likewise.
(program_name): Likewise.
(program_argv): Rename to...
(program_args): ...this.
(wrapper_argv): New variable.
(start_inferior): Delete function.
(get_exec_wrapper): New function.
(get_exec_file): Likewise.
(get_environ): Likewise.
(prefork_hook): Likewise.
(post_fork_inferior): Likewise.
(postfork_hook): Likewise.
(postfork_child_hook): Likewise.
(handle_v_run): Update code to deal with arguments coming from the
remote host. Update calls from "start_inferior" to
"create_inferior".
(captured_main): Likewise. Initialize environment variable. Call
"have_job_control".
* server.h (post_fork_inferior): New prototype.
(get_environ): Likewise.
(last_status): Declare.
(last_ptid): Likewise.
(signal_pid): Likewise.
* spu-low.c: Include "common-inferior.h" and "nat/fork-inferior.h".
(spu_ptrace_fun): New function.
(spu_create_inferior): Adjust function prototype to reflect change
on "target.h". Adjust function code to use "fork_inferior".
* target.c (target_terminal_init): New function.
(target_terminal_inferior): Likewise.
(target_terminal_ours): Likewise.
* target.h: Include <vector>.
(struct target_ops) <create_inferior>: Update prototype.
(create_inferior): Update macro.
* utils.c (gdb_flush_out_err): New function.
* win32-low.c (win32_create_inferior): Adjust function prototype
and code to reflect change on "target.h".
gdb/testsuite/ChangeLog:
2017-06-07 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.server/non-existing-program.exp: Update regex in order to
reflect the fact that gdbserver is now using fork_inferior (with a
shell) to startup the inferior.
The previous commit introduced gdb/configure.nat, but it was just a
copy-and-past (with the necessary adjustments) from the files under
gdb/config/. We can do better than that.
Instead of using one big 'case' statement that matches the
${gdb_host_cpu} and then match each ${gdb_host}, it is possible to
remove a lof of redundancy by matching the most common ${gdb_host}'s
first, setting the common variables for each, and then proceed to
matching specific ${gdb_host}'s and ${gdb_host_cpu}'s. In other
words, reverse the order of the 'case's and take advantage of the fact
that a lot of parameters are the same for each host.
This commit was tested on x86_64 without regressions.
gdb/ChangeLog:
2017-05-06 Sergio Durigan Junior <sergiodj@redhat.com>
* configure.nat: Rearrange 'case' statements to match
host before cpu.
Due to my ongoing work to make it possible for gdbserver to start the
inferior using the shell, I had to share the fork_inferior function
under the "nat/" directory. In order to do that, I created a new file
and put the function there; however, this meant that I now had to
update some of the *.mh files (under "gdb/config") and add the new
file as a dependency to be built natively. Bleh...
After talking a bit to Pedro about this, the idea came up to write a
new "gdb/configure.nat" file, a la "gdb/configure.tgt", which would
concentrate all of the native settings for each host/system. I
decided to tackle this issue.
The patch is simple. All of the previous Makefile variables that were
being declared inside the *.mh files are now inside "gdb/Makefile.in",
and "gdb/configure" is responsible for AC_SUBST'ing them. The
definitions of these variables were put inside "gdb/configure.nat", so
now they're shell variables. For excerpts of Makefile code, one must
create a file under "gdb/config/${gdb_cpu_host}" and reference it on
the "nat_extra_makefile_frag" variable.
It should now be easier to update the native dependencies of hosts in
this single file.
This has been tested on x86_64 without regressions.
gdb/ChangeLog:
2017-05-06 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile.in: Remove "@host_makefile_frag@". Add variables
NAT_FILE, NATDEPFILES, NAT_CDEPS, LOADLIBES, MH_CFLAGS, XM_CLIBS,
NAT_GENERATED_FILES, HAVE_NATIVE_GCORE_HOST. Add
"@nat_extra_makefile_frag@".
(Makefile): Remove dependency on "@frags@".
($(GNULIB_BUILDDIR)/Makefile): Likewise.
(data-directory/Makefile): Likewise.
* config/aarch64/linux.mh: Deleted; moved contents to
"gdb/configure.nat".
* config/alpha/alpha-linux.mh: Likewise.
* config/alpha/nbsd.mh: Likewise.
* config/arm/linux.mh: Likewise.
* config/arm/nbsdelf.mh: Likewise.
* config/i386/cygwin.mh: Likewise.
* config/i386/cygwin64.mh: Likewise.
* config/i386/darwin.mh: Likewise.
* config/i386/fbsd.mh: Likewise.
* config/i386/fbsd64.mh: Likewise.
* config/i386/go32.mh: Likewise.
* config/i386/i386gnu.mh: Likewise.
* config/i386/i386sol2.mh: Likewise.
* config/i386/linux.mh: Likewise.
* config/i386/linux64.mh: Likewise.
* config/i386/mingw.mh: Likewise.
* config/i386/mingw64.mh: Likewise.
* config/i386/nbsd64.mh: Likewise.
* config/i386/nbsdelf.mh: Likewise.
* config/i386/nto.mh: Likewise.
* config/i386/obsd.mh: Likewise.
* config/i386/obsd64.mh: Likewise.
* config/i386/sol2-64.mh: Likewise.
* config/ia64/linux.mh: Likewise.
* config/m32r/linux.mh: Likewise.
* config/m68k/linux.mh: Likewise.
* config/m68k/nbsdelf.mh: Likewise.
* config/m68k/obsd.mh: Likewise.
* config/m88k/obsd.mh: Likewise.
* config/mips/fbsd.mh: Likewise.
* config/mips/linux.mh: Likewise.
* config/mips/nbsd.mh: Likewise.
* config/mips/obsd64.mh: Likewise.
* config/pa/linux.mh: Likewise.
* config/pa/nbsd.mh: Likewise.
* config/pa/obsd.mh: Likewise.
* config/powerpc/aix.mh: Likewise.
* config/powerpc/fbsd.mh: Likewise.
* config/powerpc/linux.mh: Likewise.
* config/powerpc/nbsd.mh: Likewise.
* config/powerpc/obsd.mh: Likewise.
* config/powerpc/ppc64-linux.mh: Likewise.
* config/powerpc/spu-linux.mh: Likewise.
* config/s390/linux.mh: Likewise.
* config/sh/nbsd.mh: Likewise.
* config/sparc/fbsd.mh: Likewise.
* config/sparc/linux.mh: Likewise.
* config/sparc/linux64.mh: Likewise.
* config/sparc/nbsd64.mh: Likewise.
* config/sparc/nbsdelf.mh: Likewise.
* config/sparc/obsd64.mh: Likewise.
* config/sparc/sol2.mh: Likewise.
* config/tilegx/linux.mh: Likewise.
* config/vax/nbsdelf.mh: Likewise.
* config/vax/obsd.mh: Likewise.
* config/xtensa/linux.mh: Likewise.
* config/i386/i386gnu.mn: New file, with excerpts from
"config/i386/i386gnu.mh".
* configure: Regenerate.
* configure.ac: Rewrite code to use "gdb/configure.nat" instead of
*.mh files under "gdb/config".
* configure.nat: New file, with contents from the
"gdb/config/*/*.mh" files.
gdb/doc/ChangeLog:
2017-05-06 Sergio Durigan Junior <sergiodj@redhat.com>
* Makefile: Remove "@host_makefile_frag@".
Simon Marchi
Sergio Durigan Junior
Pedro Alves