Re: Building Bedrockdb in cygwin

["Csaba Ráduly" <rcsaba@gmail.com>]

On 14/05/2019 19:11, Jose Isaias Cabrera wrote:
(snip)

> However, having jumped that huddle, I encountered a new one, which is probably easier to deal with. The make command does a lot of work, but once it's going to start compiling, I get,
> 
> [good stuff clipped]
>    CC    util/pem2der.c
>    CC    util/strerror.c
>    CC    x509/cert_app.c
>    CC    x509/crl_app.c
>    CC    x509/cert_req.c
>    CC    x509/cert_write.c
>    CC    x509/req_app.c
> make[2]: Leaving directory '/home/e608313/Bedrock/mbedtls/programs'
> make[1]: Leaving directory '/home/e608313/Bedrock/mbedtls'
> g++-6 -g -std=c++14 -fpic -O2 -Wall -Werror -Wformat-security -DGIT_REVISION=ce62c88 -I/home/e608313/Bedrock -I/home/e608313/Bedrock/mbedtls/include -MMD -MF libstuff/libstuff.d -MT libstuff/libstuff.h.gch -c libstuff/libstuff.h
> make: g++-6: Command not found
> make: *** No rule to make target 'libstuff/libstuff.d', needed by '.build/libstuff/libstuff.d'.  Stop.
> 
> So, it appears that I need something called g++-6. I have both gcc and g++
> 
> $ ls /usr/bin/g++*
> /usr/bin/g++.exe*
> 
> So, the question is, what is g++-6, and how to I get it?  I tried to find it with cygwin's setup, but it's not on the distro.  I tried to duckduckgo it, but I didn't get anything useful.  Thoughts?  Thanks

g++-6 is version 6 of the C++ compiler in the GNU Compiler Collection.

Cygwin's gcc and g++ is version 7.4.0:
$ g++.exe -dumpversion
7.4.0

Bedrockdb's makefile begins with:

# Set the compiler, if it's not set by the environment.
ifndef GXX
         GXX = g++-6
endif

ifndef CC
         CC = gcc-6
endif

so the C++ compiler (GXX) is set to g++-6 unless GXX is set explicitly.


You need to run make like this:

CC=gcc GXX=g++ make <whatever arguments you gave to make, if any>

This will force make to use g++ instead of g++-6

Hope this helps,

Csaba
-- 
You can get very substantial performance improvements
by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler
So if you're looking for a completely portable, 100% standards-conformat way
to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK)

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