configure.ac: Introduce macros to simplify requiring tools.
## what
Introduce two `ZC_REQUIRE_(PROG|TOOL)` macros that are like `AC_PATH_(PROG|TOOL)` except they immediately error out if the target program is not detected.
Then require almost all programs, except for two known optional cases: three programs required only if `--with-lcov` is given, and then `ccache` which has exceptional logic (The equivalent of "--enable-ccache=auto" by default, with explicit 'yes' or 'no' possible, each with different detection needs.)
## why
Provide early explicit errors for build misconfigurations. Hopefully this should never hit our "standard official flow" which relies on the `./zcutil/build.sh` path, though it may come into play for anyone experimenting with the build system or altering dependencies.
### background motivation
While prototyping a nix build system I didn't provide the `cargo` program to the `zcashd` build process. `./configure` happily exited with a success value, but the build system was instantiated with the `CARGO` make / shell variable set to the empty string, which lead to a strange command execution where a long command of `… $CARGO build …` became `… build …`, so bash looked for a program named `build`. I spent a bit too long looking for where "build" was defined in our dependencies. 😆
Update secp256k1
This migrates us to the same dependency version that upstream Bitcoin
Core migrated to in bitcoin/bitcoin#19944.
Also enables the endomorphism optimization now that the patents have
expired.
zcash/zcash#4740 removed OpenSSL from our depends system, so we were
not satisfying this linker flag intentionally. Configurations where a
target OpenSSL could not be found by the linker, such as cross-compiles
and native macOS builds, were therefore failing. However, OpenSSL is
likely available in the system for all the "supported builders" (which
are all Linux-based), so the linker was likely being satisfied by that
library, enabling the previous PR to be merged.
leveldb's buildsystem causes us a few problems:
- breaks out-of-tree builds
- forces flags used for some tools
- limits cross builds
Rather than continuing to add wrappers around it, simply integrate it into our
build.
The --enable-online-rust configure flag replicates the behaviour of the
LIBRUSTZCASH_OVERRIDE environment variable (enabling the build system to
use crates.io instead of vendored dependencies).
-fwrapv and -ftrapv conflict, and whichever is last takes precedence
(for gcc). This meant that -ftrapv was being ignored when --enable-debug
was set. This commit correctly sets only one of them based on whether
--enable-debug is set.
Part of #4317.
Benchmarking framework, loosely based on google's micro-benchmarking
library (https://github.com/google/benchmark)
Wny not use the Google Benchmark framework? Because adding Even More Dependencies
isn't worth it. If we get a dozen or three benchmarks and need nanosecond-accurate
timings of threaded code then switching to the full-blown Google Benchmark library
should be considered.
The benchmark framework is hard-coded to run each benchmark for one wall-clock second,
and then spits out .csv-format timing information to stdout. It is left as an
exercise for later (or maybe never) to add command-line arguments to specify which
benchmark(s) to run, how long to run them for, how to format results, etc etc etc.
Again, see the Google Benchmark framework for where that might end up.
See src/bench/MilliSleep.cpp for a sanity-test benchmark that just benchmarks
'sleep 100 milliseconds.'
To compile and run benchmarks:
cd src; make bench
Sample output:
Benchmark,count,min,max,average
Sleep100ms,10,0.101854,0.105059,0.103881
Various changes:
* Don't check $GCC and $GXX
* Prefer -Og instead of -O0
* If -g3 isn't available, use -g
This also incidentally fixes compiler warnings with GCC and glibc when using
--enable-debug, as the old default values mixed poorly with the hardening flags.
Homu
Nate Wilcox
Kris Nuttycombe
Sean Bowe
therealyingtong
Jack Grigg
fanquake
Cory Fields
therealyingtong
Gavin Andresen
sandakersmann
Carl Dong
practicalswift
Chun Kuan Lee
Evan Klitzke