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## Configuration and Build

By default Boost.Stacktrace is a header-only library, but you may change that and use the following macros to improve build times or to be able to tune library without recompiling your project:

Table 37.1. Link macros

Macro name | Effect
--- | ---
BOOST_STACKTRACE_LINK | Disable header-only build and require linking with shared or static library that contains the tracing implementation. If BOOST_ALL_DYN_LINK is defined, then link with shared library.
BOOST_STACKTRACE_DYN_LINK | Disable header-only build and require linking with shared library that contains tracing implementation.

In header only mode library could be tuned by macro. If one of the link macro from above is defined, you have to manually link with one of the libraries:

Table 37.2. Config

Macro name or default | Library | Effect | Platforms | Uses debug information [a] | Uses dynamic exports information [b]
--- | --- | --- | --- | --- | ---
default for MSVC, Intel on Windows, MinGW-w64 / BOOST_STACKTRACE_USE_WINDBG | boost_stacktrace_windbg | Uses COM to show debug info. May require linking with ole32 and dbgeng. | MSVC, MinGW-w64, Intel on Windows | yes | no
default for other platforms | boost_stacktrace_basic | Uses compiler intrinsics to collect stacktrace and if possible `::dladdr` to show information about the symbol. Requires linking with libdl library on POSIX platforms. | Any compiler on POSIX or MinGW | no | yes
BOOST_STACKTRACE_USE_WINDBG_CACHED | boost_stacktrace_windbg_cached | Uses COM to show debug info and caches COM instances in TLS for better performance. Useful only for cases when traces are gathered very often. [c] May require linking with ole32 and dbgeng. | MSVC, Intel on Windows | yes | no
BOOST_STACKTRACE_USE_BACKTRACE | boost_stacktrace_backtrace | Requires linking with libdl on POSIX and libbacktrace libraries. libbacktrace is probably already installed in your system[d], or built into your compiler. Otherwise (if you are a MinGW/MinGW-w64 user for example) it can be downloaded from here or from here. | Any compiler on POSIX, or MinGW, or MinGW-w64 | yes | yes
BOOST_STACKTRACE_USE_ADDR2LINE | boost_stacktrace_addr2line | Use addr2line program to retrieve stacktrace. Requires linking with libdl library and `::fork` system call. Macro BOOST_STACKTRACE_ADDR2LINE_LOCATION must be defined to the absolute path to the addr2line executable if it is not located in /usr/bin/addr2line. | Any compiler on POSIX | yes | yes
BOOST_STACKTRACE_USE_NOOP | boost_stacktrace_noop | Use this if you wish to disable backtracing. `stacktrace::size()` with that macro always returns 0. | All | no | no
[a] This will provide more readable backtraces with source code locations if the binary is built with debug information. [b] This will provide readable function names in backtrace for functions that are exported by the binary. Compiling with `-rdynamic` flag, without `-fisibility=hidden` or marking functions as exported produce a better stacktraces. [c] This may affect other components of your program that use COM, because this mode calls the `CoInitializeEx(0, COINIT_MULTITHREADED)` on first use and does not call `::CoUninitialize();` until the current thread is destroyed. [d] If you are using Clang with libstdc++ you could get into troubles of including `<backtrace.h>`, because on some platforms Clang does not search for headers in the GCC's include paths and any attempt to add GCC's include path leads to linker errors. To explicitly specify a path to the `<backtrace.h>` header you could define the BOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE to a full path to the header. For example on Ubuntu Xenial use the command line option -DBOOST_STACKTRACE_BACKTRACE_INCLUDE_FILE=</usr/lib/gcc/x86_64-linux-gnu/5/include/backtrace.h> while building with Clang.

Examples:

- if you wish to switch to more powerful implementation on Clang/MinGW and BOOST_STACKTRACE_LINK is defined, you just need link with "-lboost_stacktrace_backtrace -ldl -lbacktrace" or "-lboost_stacktrace_addr2line -ldl"
- if you wish to disable backtracing and BOOST_STACKTRACE_LINK is defined, you just need link with -lboost_stacktrace_noop
- if you wish to disable backtracing and you use the library in header only mode, you just need to define BOOST_STACKTRACE_USE_NOOP for the whole project and recompile it

### MinGW and MinGW-w64 specific notes

MinGW-w64 and MinGW (without -w64) users have to install libbacktrace for getting better stacktraces. Follow the instruction:

Let's assume that you've installed MinGW into C:\MinGW and downloaded libbacktrace sources into C:\libbacktrace-master

- Configure & build libbacktrace from console:
  - C:\MinGW\msys\1.0\bin\sh.exe
  - cd /c/libbacktrace-master
  - ./configure CC=/c/MinGW/bin/gcc.exe CXX=/c/MinGW/bin/g++.exe
  - make
  - ./libtool --mode=install /usr/bin/install -c libbacktrace.la '/c/libbacktrace-master'
- Add info to the project-config.jam in the Boost folder:
  - using gcc : 6 : "C:\MinGW\bin\g++.exe" : <compileflags>-I"C:\libbacktrace-master\" <linkflags>-L"C:\libbacktrace-master\" ;
- Now you can use a header only version by defining BOOST_STACKTRACE_USE_BACKTRACE for your project or build the stacktrace library from Boost folder:
  - b2.exe toolset=gcc-6 --with-stacktrace