build: create a standalone build script for libsecp256k1

heavily based on Electron-Cash/Electron-Cash@eda015908e

contrib/build-wine/build-electrum-git.sh

@@ -6,7 +6,6 @@ NAME_ROOT=electrum
 export WINEPREFIX=/opt/wine64
 export WINEDEBUG=-all
 export PYTHONDONTWRITEBYTECODE=1
-export PYTHONHASHSEED=22
 
 PYHOME=c:/python3
 PYTHON="wine $PYHOME/python.exe -OO -B"

contrib/build-wine/build-secp256k1.sh

@@ -1,56 +0,0 @@
-#!/bin/bash
-# heavily based on https://github.com/ofek/coincurve/blob/417e726f553460f88d7edfa5dc67bfda397c4e4a/.travis/build_windows_wheels.sh
-
-set -e
-
-here="$(dirname "$(readlink -e "$0")")"
-LIBSECP_VERSION="b408c6a8b287003d1ade5709e6f7bc3c7f1d5be7"
-
-. "$CONTRIB"/build_tools_util.sh
-
-info "building libsecp256k1..."
-
-
-build_dll() {
-    #sudo apt-get install -y mingw-w64
-    export SOURCE_DATE_EPOCH=1530212462
-    echo "LDFLAGS = -no-undefined" >> Makefile.am
-    ./autogen.sh
-    # Note: set both --build and --host when running configure
-    # Otherwise weird voodoo magic happens with Docker and Wine.
-    # https://www.gnu.org/software/autoconf/manual/autoconf-2.69/html_node/Hosts-and-Cross_002dCompilation.html
-    LDFLAGS="-Wl,--no-insert-timestamp" ./configure \
-        --host=$1 \
-        --build=x86_64-pc-linux-gnu \
-        --enable-module-recovery \
-        --enable-experimental \
-        --enable-module-ecdh \
-        --disable-jni
-    make -j4
-    ${1}-strip .libs/libsecp256k1-0.dll
-}
-
-
-cd "$CACHEDIR"
-
-if [ -f "secp256k1/libsecp256k1.dll" ]; then
-    info "libsecp256k1.dll already built, skipping"
-    exit 0
-fi
-
-
-if [ ! -d secp256k1 ]; then
-    git clone https://github.com/bitcoin-core/secp256k1.git
-fi
-
-cd secp256k1
-git reset --hard
-git clean -f -x -q
-git checkout $LIBSECP_VERSION
-
-build_dll i686-w64-mingw32  # 64-bit would be: x86_64-w64-mingw32
-mv .libs/libsecp256k1-0.dll libsecp256k1.dll
-
-find -exec touch -d '2000-11-11T11:11:11+00:00' {} +
-
-info "building libsecp256k1 finished"

contrib/build-wine/build.sh

@@ -2,16 +2,19 @@
 
 set -e
 
-# Lucky number
-export PYTHONHASHSEED=22
-
 here="$(dirname "$(readlink -e "$0")")"
 test -n "$here" -a -d "$here" || exit
 
 export CONTRIB="$here/.."
+export PROJECT_ROOT="$CONTRIB/.."
 export CACHEDIR="$here/.cache"
 export PIP_CACHE_DIR="$CACHEDIR/pip_cache"
 
+export BUILD_TYPE="wine"
+export GCC_TRIPLET_HOST="i686-w64-mingw32"
+export GCC_TRIPLET_BUILD="x86_64-pc-linux-gnu"
+export GCC_STRIP_BINARIES="1"
+
 . "$CONTRIB"/build_tools_util.sh
 
 info "Clearing $here/build and $here/dist..."
@@ -20,7 +23,11 @@ rm "$here"/dist/* -rf
 
 mkdir -p "$CACHEDIR" "$PIP_CACHE_DIR"
 
-$here/build-secp256k1.sh || fail "build-secp256k1 failed"
+if [ -f "$PROJECT_ROOT/electrum/libsecp256k1-0.dll" ]; then
+    info "libsecp256k1 already built, skipping"
+else
+    "$CONTRIB"/make_libsecp256k1.sh || fail "Could not build libsecp"
+fi
 
 $here/prepare-wine.sh || fail "prepare-wine failed"
 

contrib/build-wine/deterministic.spec

@@ -34,7 +34,7 @@ binaries = []
 # Workaround for "Retro Look":
 binaries += [b for b in collect_dynamic_libs('PyQt5') if 'qwindowsvista' in b[0]]
 
-binaries += [('C:/tmp/libsecp256k1.dll', '.')]
+binaries += [('C:/tmp/libsecp256k1-0.dll', '.')]
 binaries += [('C:/tmp/libusb-1.0.dll', '.')]
 
 datas = [

contrib/build-wine/prepare-wine.sh

@@ -89,7 +89,6 @@ info "Compiling libusb..."
     git remote add origin $LIBUSB_REPO
     git fetch --depth 1 origin $LIBUSB_COMMIT
     git checkout -b pinned FETCH_HEAD
-    export SOURCE_DATE_EPOCH=1530212462
     echo "libusb_1_0_la_LDFLAGS += -Wc,-static" >> libusb/Makefile.am
     ./bootstrap.sh || fail "Could not bootstrap libusb"
     host="i686-w64-mingw32"
@@ -102,8 +101,8 @@ info "Compiling libusb..."
 cp "$CACHEDIR/libusb/libusb/.libs/libusb-1.0.dll" $WINEPREFIX/drive_c/tmp/  || fail "Could not copy libusb to its destination"
 
 
-# copy libsecp dll (already built by build-secp256k1.sh)
-cp "$CACHEDIR/secp256k1/libsecp256k1.dll" $WINEPREFIX/drive_c/tmp/ || fail "Could not copy libsecp to its destination"
+# copy libsecp dll (already built)
+cp "$PROJECT_ROOT/electrum/libsecp256k1-0.dll" $WINEPREFIX/drive_c/tmp/ || fail "Could not copy libsecp to its destination"
 
 
 info "Building PyInstaller."