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Functions and variables that are exported by the IPA DSO (that GDBserver needs to look up) should have "C" mangling, thus be declared with extern "C". Function and variable declarations need the extern "C" marker, but variable definitions can't be marked extern, so the patch splits IP_AGENT_EXPORT into three. Building in C++ mode revealed that a few variables were missing IP_AGENT_EXPORT, thus the IPA has been broken when stripped, even in C mode... So this ends being a bug fix as well. gdb/ChangeLog: 2015-02-27 Pedro Alves <palves@redhat.com> * common/agent.h (IPA_SYM_EXPORTED_NAME): New. (IPA_SYM): Use it. * common/common-defs.h (EXTERN_C_PUSH, EXTERN_C_POP): New macros. gdb/gdbserver/ChangeLog: 2015-02-27 Pedro Alves <palves@redhat.com> * linux-amd64-ipa.c (gdb_agent_get_raw_reg): Use IP_AGENT_EXPORT_FUNC. * linux-i386-ipa.c (gdb_agent_get_raw_reg): Use IP_AGENT_EXPORT_FUNC. * tracepoint.c (ATTR_USED, ATTR_NOINLINE, ATTR_CONSTRUCTOR) (IP_AGENT_EXPORT): Delete. (gdb_tp_heap_buffer, gdb_jump_pad_buffer, gdb_jump_pad_buffer_end) (gdb_trampoline_buffer, gdb_trampoline_buffer_end) (gdb_trampoline_buffer_error, collecting, gdb_collect) (stop_tracing, flush_trace_buffer, about_to_request_buffer_space) (trace_buffer_is_full, stopping_tracepoint, expr_eval_result) (error_tracepoint, tracepoints, tracing, trace_buffer_ctrl) (trace_buffer_ctrl_curr, trace_buffer_lo, trace_buffer_hi) (traceframe_read_count, traceframe_write_count) (traceframes_created, trace_state_variables, get_raw_reg) (get_trace_state_variable_value, set_trace_state_variable_value) (ust_loaded, helper_thread_id, cmd_buf): Use IPA_SYM_EXPORTED_NAME. (stop_tracing, flush_trace_buffer): Use IP_AGENT_EXPORT_FUNC. (tracepoints) Use IP_AGENT_EXPORT_VAR. (stopping_tracepoint, trace_buffer_is_full, expr_eval_result): Use IP_AGENT_EXPORT_VAR and wrap in EXTERN_C_PUSH/EXTERN_C_POP. (last_tracepoint): Move into !IN_PROCESS_AGENT block. (error_tracepoint): Use IP_AGENT_EXPORT_VAR and wrap in EXTERN_C_PUSH/EXTERN_C_POP. (trace_state_variables): Use IP_AGENT_EXPORT_VAR. (trace_buffer_lo, trace_buffer_hi): Use IP_AGENT_EXPORT_VAR and wrap in EXTERN_C_PUSH/EXTERN_C_POP. (trace_buffer_ctrl, trace_buffer_ctrl_curr) (traceframe_write_count, traceframe_read_count) (traceframes_created, tracing): Use IP_AGENT_EXPORT_VAR. (about_to_request_buffer_space, get_trace_state_variable_value) (set_trace_state_variable_value): Use IP_AGENT_EXPORT_FUNC. (collecting): Use IP_AGENT_EXPORT_VAR and wrap in EXTERN_C_PUSH/EXTERN_C_POP. (gdb_collect): Use IP_AGENT_EXPORT_FUNC. (ust_loaded, cmd_buf): Use IP_AGENT_EXPORT_VAR. (helper_thread_id, gdb_agent_capability): Use IP_AGENT_EXPORT_VAR and wrap in EXTERN_C_PUSH/EXTERN_C_POP. (gdb_tp_heap_buffer, gdb_jump_pad_buffer, gdb_jump_pad_buffer_end) (gdb_trampoline_buffer, gdb_trampoline_buffer_end) (gdb_trampoline_buffer_error): Use IP_AGENT_EXPORT_VAR. * tracepoint.h (ATTR_USED, ATTR_NOINLINE, EXPORTED_SYMBOL): Define. (IP_AGENT_EXPORT_FUNC, IP_AGENT_EXPORT_VAR) (IP_AGENT_EXPORT_VAR_DECL): Define. (tracing): Declare. (gdb_agent_get_raw_reg): Declare.
README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.