2f5dfe4a7f depends: build qt in c++17 mode (fanquake)
104e859c97 builds: don't pass -silent to qt when building in debug mode (fanquake)
e2c500636c depends: build zeromq with -std=c++17 (fanquake)
2374f2fbef depends: build Boost with -std=c++17 (fanquake)
2dde55702d depends: build bdb with -std=c++17 (fanquake)
Pull request description:
In packages where we are passing `-std=c++11` switch to `-std=c++17`, or, `-std=c++1z` in the case of Qt.
This PR also contains a [commit](104e859c97) that improves debug output when building Qt for debugging (`DEBUG=1`).
Now we'll get output like this:
```bash
g++ -c -pipe -ffunction-sections -O2 -fPIC -std=c++11 -fno-exceptions <lots more> ../../corelib/kernel/qcoreapplication.cpp
```
rather than just:
```bash
compiling ../../corelib/kernel/qcoreapplication.cpp
```
Note that when you look at the DEBUG output for these changes when building Qt, you'll see objects being compiled with a mix of C++11 and C++17. The breakdown is roughly:
1. `qmake` built with `-std=c++11`:
```bash
Creating qmake...
make[1]: Entering directory '<trim>/qt/5.9.8-4110fa99945/qtbase/qmake'
g++ -c -o project.o -std=c++11 -ffunction-sections -O2 -g <trim> <trim>/qt/5.9.8-4110fa99945/qtbase/qmake/project.cpp
# when qmake, Qt also builds some of it's corelib, such as corelib/global/qmalloc.cpp
g++ -c -o qmalloc.o -std=c++11 -ffunction-sections -O2 -g <trim> <trim>/qt/5.9.8-4110fa99945/qtbase/src/corelib/global/qmalloc.cpp
```
2. `qmake` is run, and passed our build options, including `-c++std`:
```bash
make[1]: Entering directory '<trim>/qt/5.9.8-4110fa99945/qtbase'
<trim>qt/5.9.8-4110fa99945/qtbase/bin/qmake -o Makefile qtbase.pro -- -bindir <trim>/native/bin -c++std c++1z -confirm-license <trim>
```
3. After some cleaning and configuring, we actually start to build Qt, as well as it's tools and internal libs:
```bash
Building qt...
make[1]: Entering directory '<trim>/qt/5.9.8-4110fa99945/qtbase/src'
# build libpng, zlib etc
gcc -c -m64 -pipe -pipe -O1 <trim> -o .obj/png.o png.c
# build libQt5Bootstrap, using C++11, which again compiles qmalloc.cpp
make[2]: Entering directory '<trim>/qt/5.9.8-4110fa99945/qtbase/src/tools/bootstrap'
g++ -c -pipe -ffunction-sections -O2 -fPIC -std=c++11 <trim> -o .obj/qmalloc.o ../../corelib/global/qmalloc.cpp
# build a bunch of tools like moc, rcc, uic, qfloat16-tables, qdbuscpp2xml, using C++11
g++ -c -pipe -O2 -std=c++11 -fno-exceptions -Wall -W <trim> -o .obj/rcc.o rcc.cpp
# from here, Qt is compiled with -std=c++1z, including qmalloc.cpp, for the third and final time:
g++ -c -include .pch/Qt5Core <trim> -g -Og -fPIC -std=c++1z -fvisibility=hidden <trim> -o .obj/qmalloc.o global/qmalloc.cpp
```
4. Finally, build tools like `lrelease`, `lupdate`, etc, but back to using -std=c++11
```bash
make[1]: Entering directory '<trim>/qt/5.9.8-4110fa99945/qttools/src/linguist/lrelease'
g++ -c -pipe -O2 -std=c++11 -fno-exceptions -Wall -W <trim> -o .obj/translator.o ../shared/translator.cpp
```
If you dump the debug info from the built Qt libs, they should also tell you that they were compiled with `C++17`:
```bash
objdump -g bitcoin/depends/x86_64-pc-linux-gnu/lib/libQt5Core.a
GNU C++17 9.3.0 -m64 -mtune=generic -march=x86-64 -g -O1 -Og -std=c++17 -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -fasynchronous-unwind-tables -fstack-protector-strong -fstack-clash-protection -fcf-protection
```
ACKs for top commit:
laanwj:
Code review ACK 2f5dfe4a7f
practicalswift:
cr ACK 2f5dfe4a7ff12b6b57427374142cdf7e266b73bc: patch looks correct
fjahr:
Code review ACK 2f5dfe4a7f
hebasto:
ACK 2f5dfe4a7f, I have reviewed the code and it looks OK, I agree it can be merged.
Tree-SHA512: fc5e9d7c7518c68349c8228fb1aead829850373efc960c9b8c079096a83d1dad19c62a9730fce5802322bf07e320960fd47851420d429eda0a87c307f4e8b03a
fanquake
2e1336dbfe