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The GDB version used on ARC is based on a recent gdb code base, post
gdb 9.2. This recent gdb code base, which pre-figures what will be in
gdb 10, has a significant change: gdbserver is not longer in
gdb/gdbserver, but at the top-level, and the mechanism to build
gdbserver only has changed. Due to this change, a build of ARC GDB for
gdbserver only fails with:
/bin/bash: line 0: cd: /opt/output/build/gdb-arc-2020.03-release-gdb/gdb/gdbserver: No such file or directory
This commit adjusts gdb.mk to support four cases:
- "old" gdb, gdbserver only
- "old" gdb, with the gdb debugger (and optionally gdbserver as well)
- "new" gdb, gdbserver only
- "new" gdb, with the gdb debugger (and optionally gdbserver as well)
A boolean GDB_GDBSERVER_TOPLEVEL is introduced to differentiate
between the old and new gdb, it is set to "y" for gdb versions that
have the gdbserver code at the top-level. For now, only the ARC
version sets it, but in the future, upstream gdb version 10 will also
have to set it.
Here is the behavior, for each case:
(1) "old" gdb, gdbserver only
We set GDB_SUBDIR to gdb/gdbserver, so only the configure script
in this folder gets called.
--enable-gdbserver --disable-gdb are passed in CONF_OPTS.
(2) "old" gdb, with the gdb debugger (and optionally gdbserver as well)
We set GDB_SUBDIR to build/, an empty directory which allows to
do an out of tree build, which is mandatory for a full gdb build
since gdb 9.x.
--enable-gdb is passed in CONF_OPTS as well as --enable-gdbserver
or --disable-gdbserver depending on whether gdbserver is enabled
as well.
(3) "new" gdb, gdbserver only
We set GDB_SUBDIR to build/, an empty directory which allows to
do an out of tree build, which is mandatory for a full gdb build
since gdb 9.x.
--enable-gdbserver --disable-gdb are passed in CONF_OPTS.
(4) "new" gdb, with the gdb debugger (and optionally gdbserver as well)
We set GDB_SUBDIR to build/, an empty directory which allows to
do an out of tree build, which is mandatory for a full gdb build
since gdb 9.x.
--enable-gdb is passed in CONF_OPTS as well as --enable-gdbserver
or --disable-gdbserver depending on whether gdbserver is enabled
as well.
In addition to these changes, some related changes are done as well:
- We re-enable building both gdb and gdbserver on ARC, as it works
again.
- We only pass --with-curses when curses is really provided, i.e when
the full debugger is being built.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Tested-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
91 lines
2.8 KiB
Plaintext
91 lines
2.8 KiB
Plaintext
config BR2_PACKAGE_GDB_ARCH_SUPPORTS
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bool
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default y
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depends on !((BR2_arm || BR2_armeb) && BR2_BINFMT_FLAT)
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depends on !BR2_microblaze
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depends on !BR2_nios2
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depends on !BR2_or1k
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depends on !BR2_nds32
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comment "gdb/gdbserver needs a toolchain w/ threads, threads debug"
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depends on BR2_PACKAGE_GDB_ARCH_SUPPORTS
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depends on !BR2_TOOLCHAIN_HAS_THREADS || !BR2_TOOLCHAIN_HAS_THREADS_DEBUG
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comment "gdb/gdbserver >= 8.x needs a toolchain w/ C++, gcc >= 4.8"
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depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
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config BR2_PACKAGE_GDB
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bool "gdb"
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depends on BR2_TOOLCHAIN_HAS_THREADS && BR2_TOOLCHAIN_HAS_THREADS_DEBUG
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depends on BR2_PACKAGE_GDB_ARCH_SUPPORTS
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depends on BR2_TOOLCHAIN_GCC_AT_LEAST_4_8
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depends on BR2_INSTALL_LIBSTDCPP
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# no gdbserver on riscv
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select BR2_PACKAGE_GDB_DEBUGGER if BR2_riscv
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# When the external toolchain gdbserver is copied to the
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# target, we don't allow building a separate gdbserver. The
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# one from the external toolchain should be used.
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select BR2_PACKAGE_GDB_SERVER if \
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(!BR2_PACKAGE_GDB_DEBUGGER && !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY)
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help
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GDB, the GNU Project debugger, allows you to see what is
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going on `inside' another program while it executes -- or
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what another program was doing at the moment it crashed.
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This option allows to build gdbserver and/or the gdb
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debugger for the target.
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For embedded development, the most common solution is to
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build only 'gdbserver' for the target, and use a cross-gdb
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on the host. See BR2_PACKAGE_HOST_GDB in the Toolchain menu
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to enable one. Notice that external toolchains often provide
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their own pre-built cross-gdb and gdbserver binaries.
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http://www.gnu.org/software/gdb/
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if BR2_PACKAGE_GDB
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config BR2_PACKAGE_GDB_SERVER
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bool "gdbserver"
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depends on !BR2_TOOLCHAIN_EXTERNAL_GDB_SERVER_COPY
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depends on !BR2_riscv
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help
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Build the gdbserver stub to run on the target.
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A full gdb is needed to debug the progam.
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config BR2_PACKAGE_GDB_DEBUGGER
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bool "full debugger"
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depends on BR2_USE_WCHAR
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depends on !BR2_sh
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depends on !BR2_csky
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select BR2_PACKAGE_NCURSES
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comment "full gdb on target needs a toolchain w/ wchar"
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depends on !BR2_sh
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depends on !BR2_USE_WCHAR
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if BR2_PACKAGE_GDB_DEBUGGER
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config BR2_PACKAGE_GDB_TUI
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bool "TUI support"
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help
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This option enables terminal user interface (TUI) for gdb
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"The GDB Text User Interface (TUI) is a terminal interface
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which uses the curses library to show the source file, the
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assembly output, the program registers and GDB commands in
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separate text windows."
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https://sourceware.org/gdb/current/onlinedocs/gdb/TUI.html
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config BR2_PACKAGE_GDB_PYTHON
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bool "Python support"
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# Only Python 2.x is supported by gdb for now
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depends on BR2_PACKAGE_PYTHON
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help
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This option enables Python support in the target gdb.
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endif
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endif
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