gdb fails on mountain lion

问题

I tried to compile a 7.x Version of gdb without any luck. I codesigned the executable(http://sourceware.org/gdb/wiki/BuildingOnDarwin).

With following version there were these problems.

7.5,7.4,git clone: unknown load command 0x2a (and others) for my application and different system libraries when starting gbd. When trying to print a vector for example i always get: Could not find the frame base for "main(int, char**)"

7.3 (macports and from gdb-website): on starting the application it fails to set the breakpoint and continues to run.

(gdb) start
Temporary breakpoint 1 at 0x100000950: file ../src/main.cpp, line 15.
Starting program: [...]
BFD: unable to read unknown load command 0x24
BFD: unable to read unknown load command 0x2a
BFD: unable to read unknown load command 0x26
Error in re-setting breakpoint 1: Cannot access memory at address 0x100000950
[application continues]

I used the system llvm-gcc, gcc4.7 and svn-gcc4.8 to compile. Has anybody succeeded in installing gdb on Mountain Lion?

回答1:

i installed gdb 7.5 on mountain lion without problems...

those steps might help you: ./configure --prefix=/usr/local --enable-targets=x86_64-apple-darwin10 --enable-64-bit-bfd --disable-werror --build=x86_64-apple-darwin10 --host=x86_64-apple-darwin10 --target=x86_64-apple-darwin10
then make install gdb.
create your own certificate like discribed here and sign the gdb http://sourceware.org/gdb/wiki/BuildingOnDarwin
you have to explicitly state: codesign -s gdb-cert /usr/local/gdb before you sign the gdb make sure you already set your certificate to trusted. also close the keychain before signing your gdb.

hope this also works for your

回答2:

I resolved this issue by following the steps tried here: http://coding.derkeiler.com/Archive/Ada/comp.lang.ada/2012-09/msg00305.html

Steps

sudo chgrp procmod /usr/local/bin/gdb
sudo chmod g+s /usr/local/bin/gdb
Edit /System/Library/LaunchDaemons/com.apple.taskgated.plist and add +p argument to taskgated process
Force kill taskgated process (it will restart)
Try again

回答3:

it doesn't seem to work for me... same issue as with the default homebrew settings

v1:src zeph$ brew install gdb
==> Downloading http://ftpmirror.gnu.org/gdb/gdb-7.5.tar.bz2
Already downloaded: /Library/Caches/Homebrew/gdb-7.5.tar.bz2
==> ./configure --prefix=/usr/local/Cellar/gdb/7.5 --with-python=/usr --with-system-readline --enable-targets=x86_64-apple-darwin10 --enable-64-bit-bfd --disable-werror --build=x86_64-apple-darwin10 --hos
==> make
==> make install
==> Caveats
gdb requires special privileges to access Mach ports.
You will need to codesign the binary. For instructions, see:

  http://sourceware.org/gdb/wiki/BuildingOnDarwin
==> Summary
/usr/local/Cellar/gdb/7.5: 62 files, 9.3M, built in 119 seconds
v1:src zeph$ codesign -s gdb-cert /usr/local/Cellar/gdb/7.5/bin/gdb 
v1:src zeph$ /usr/local/Cellar/gdb/7.5/bin/gdb --args /Users/zeph/tmp/CouchBase/src/install/bin/memcached -d -u root -P /tmp/0libmemcached_memc.pid -t 1 -p 11221 -U 11221 -m 128
GNU gdb (GDB) 7.5
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin10".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
BFD: /Users/zeph/tmp/CouchBase/src/install/bin/memcached: unknown load command 0x29
BFD: /Users/zeph/tmp/CouchBase/src/install/bin/memcached: unknown load command 0x29
Reading symbols from /Users/zeph/tmp/CouchBase/src/install/bin/memcached...done.
(gdb) run
Starting program: /Users/zeph/tmp/CouchBase/src/install/bin/memcached -d -u root -P /tmp/0libmemcached_memc.pid -t 1 -p 11221 -U 11221 -m 128
Unable to find Mach task port for process-id 28755: (os/kern) failure (0x5).
 (please check gdb is codesigned - see taskgated(8))
(gdb)

k, I had to re-sign it after having TRUSTED the certificate all across the board

codesign -fs gdb-cert /usr/local/Cellar/gdb/7.5/bin/gdb

回答4:

There were two issues in the OP's question. The one regarding signing the executable or modifying taskgated and using setgid procmod has been covered. The second issue is the warnings about unknown load commands. I too ran into this and after a bunch of searching came across the following patches, that fix it:

https://gist.github.com/davidbalbert/4197567

来源：https://stackoverflow.com/questions/12050257/gdb-fails-on-mountain-lion

标签

gdb

osx-mountain-lion

bfd