Windows build: gdb.build.bash needs undocumented dependencies.

[ghost]

Hi,

I’m trying to build the AVR Toolchain from, and for, Windows, but I get some issues during the execution of gdb.build.bash
Here what I did:

1. Setup:

• I installed Cygwin (32bits) and added the packages as explained on the front page of this repo, excepted for texinfo because the Cygwin setup only provides version 6. Version 4 is no more available.
• I installed MinGW.
• I cloned this repo.

2. Execution:
   From a Cygwin console I executed, one by one, the bash scripts in the order given in the documentation:

./tools.bash             # ok
./binutils.build.bash    # ok
./gcc.build.bash         # ok (very long)
./avr-libc.build.bash    # ok 
./gdb.build.bash         # aborted due to warnings and error

Here the last lines displayed

…
checking for shared library run path origin... done
checking for libexpat... no
configure: WARNING: expat is missing or unusable; some features may be unavailable.
checking whether to use python... auto
checking for python... missing
checking for python2.7... no
checking for python2.6... no
checking for python2.5... no
checking for python2.4... no
configure: WARNING: python is missing or unusable; some features may be unavailable.
checking whether to use guile... guile-2.0
checking for pkg-config... /usr/bin/pkg-config
checking for usable guile from /usr/bin/pkg-config... configure: error: unable to find usable guile version from "guile-2.0"
make[1]: *** [Makefile:9614: configure-gdb] Error 1
make[1]: Leaving directory '/c/toolchain-avr-master/gdb-build'
make: *** [Makefile:836: all] Error 2

To fix these warnings and errors (libexpat, python, guile) I added these 7 packages to my Cygwin setup (in addition to those listed in the documentation):

libexpat-devel
python2
python27-devel
libintl-devel
guile2.0
libguile2.0-devel
libgmp-devel

Here the summary of all the packages I explicitly added to the default Cygwin setup.

I hope this can be added to the documentation in the "Windows requirements" section.

Regards.

[facchinm]

Hi @blogarithme ,
would you mind filing a PR with the relevant updates/changes? It's been a while since we last built the windows toolchain with cygwin (we are currently cross-compiling from linux using mingw) but updated instruction are always useful.

[ghost]

Hi @facchinm
I first make an overview of all the problems I encounter with Cygwin and, if the experts don't detect any nonsense in my solutions, I will try my first PR.

[DamianReloaded]

This applies also to Debian 10.8 . They should probably be added in the "Debian requirements" section of readme.md

libexpat1-dev
python2
python2.7-dev
libint-dev
guile-2.0-dev
guile-2.0-libs
libgmp-dev

After adding these dependencies I was able to build gdb using gdb.build.bash (otherwise it gives Make Error 2). Maybe some of those aren't actually required. It works nonetheless.