Build facebook folly

Question

Can't build folly. Have the next folder structure:

/flint/double-conversion/src

/flint/folly/folly/

Where /flint/folly contains readme and license. As in the readme I set up double-conversion with scons, export flags with

export LDFLAGS=-L../../double-conversion/
export CPPFLAGS=-I../../double-conversion/src/

from the second folly directory and have nothing working:

checking double-conversion/double-conversion.h presence... no
checking for double-conversion/double-conversion.h... no
configure: error: Couldn't find double-conversion.h,

Also have tried absolute paths like /home/username/flint/double-conversion/ and this doesn't work too. Any suggestions?

Answer 1

I ran into the same problem while building fbthrift which depends on facebook folly. It took me some time but i have found the problem which leads to build problems with the double-conversion library.

Undo all the changes of this commit and it will build successful. https://github.com/facebook/folly/commit/56e0ec4fe2db38106311b09b88820a99860664f3#diff-0aeb0bf602d25a066eb2233e06c4a981

I hope this will also work for you if you still have this problem.

Answer 2

FWIW,

I was able to get past this by creating a symlink "double-conversion" to the src directory. Effectively, I have .../folly/double-conversion/double-conversion . Now it seems to find the .h file (double-conversion/double-conversion.h with CPPFLAGS=-I...folly/double-conversion)

Unfortunately, I'm having as many troubles on the next step....finding the double-conversion library.

Answer 3

Adding my "workaround" for using Folly on CentOS 7;

1. got double-conversion from https://github.com/google/double-conversion
2. built (using scons) which already symlinks from /usr/lib for the .so's
3. symlink'd from the double-conversion/src folder to /usr/include

At least that worked for me.