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README-dev.md

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Scribbles of madman

This branch is planned to be universal for all 3 OS (Linux, Windows, MacOS).

todo

  • Build subsystem: after build win version, if we want to build linux version for example with build-linux.sh, univalue and cryptoconditions dirs needs to be cleaned with make clean from previous build. otherwise it will not be linked
  • Check Mac build with static libs
  • Remove unneeded build-*.sh files
  • Check *.deb package build

dev notes

part 1

This file contains only dev notes. It's a some kind of notepad or "scribbles of madman" ...

objdump -T src/qt/komodo-qt | grep 2.25
0000000000000000      DF *UND*	0000000000000000  GLIBC_2.25  __explicit_bzero_chk
0000000000000000  w   DF *UND*	0000000000000000  GLIBC_2.25  getentropy

-Wl,--wrap=log2f

AX_CHECK_LINK_FLAG([[-Wl,--wrap=__divmoddi4]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=__divmoddi4"])
AX_CHECK_LINK_FLAG([[-Wl,--wrap=log2f]], [COMPAT_LDFLAGS="$COMPAT_LDFLAGS -Wl,--wrap=log2f"])

part 2

MacOS static build now produce the following binary:

src/qt/komodo-qt:
	/usr/local/opt/gcc@6/lib/gcc/6/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.22.0)
	/System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/IOKit.framework/Versions/A/IOKit (compatibility version 1.0.0, current version 275.0.0)
	/System/Library/Frameworks/Foundation.framework/Versions/C/Foundation (compatibility version 300.0.0, current version 1570.15.0)
	/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices (compatibility version 1.0.0, current version 944.3.0)
	/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit (compatibility version 45.0.0, current version 1671.40.118)
	/System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 50.1.0)
	/System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation (compatibility version 150.0.0, current version 1570.15.0)
	/System/Library/Frameworks/Security.framework/Versions/A/Security (compatibility version 1.0.0, current version 58286.251.4)
	/System/Library/Frameworks/SystemConfiguration.framework/Versions/A/SystemConfiguration (compatibility version 1.0.0, current version 963.250.1)
	/System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics (compatibility version 64.0.0, current version 1251.12.0)
	/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/Carbon.framework/Versions/A/Carbon (compatibility version 2.0.0, current version 158.0.0)
	/System/Library/Frameworks/CoreText.framework/Versions/A/CoreText (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/LDAP.framework/Versions/A/LDAP (compatibility version 1.0.0, current version 2.4.0)
	/usr/lib/libc++.1.dylib (compatibility version 1.0.0, current version 400.9.4)
	/usr/local/opt/gcc@6/lib/gcc/6/libgomp.1.dylib (compatibility version 2.0.0, current version 2.0.0)
	/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.250.1)
	/usr/local/lib/gcc/6/libgcc_s.1.dylib (compatibility version 1.0.0, current version 1.0.0)
	/System/Library/Frameworks/CFNetwork.framework/Versions/A/CFNetwork (compatibility version 1.0.0, current version 978.0.7)
	/System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO (compatibility version 1.0.0, current version 1.0.0)
	/usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)

To avoid dynamic linking from /usr/local/lib/gcc/6/ need to add -static-libgcc linker flag, but binary compiled and linked this way with gcc6 produced some exceptions right after launch, probably due this:

https://stackoverflow.com/questions/50920999/why-dont-exceptions-work-with-gcc7-and-static-libgcc-on-osx

So, the solution is build with gcc6, but link with gcc8, like ../libtool --tag CXX --mode=link g++-8 -g -O2 <...> -static-libgcc .

part 3 (optimisations)

since we have Add SSE4 optimized SHA256 and --enable-experimental-asm build flag, probably we need to change SHA256 implementation in other places, like:

komodo_utils.h

void vcalc_sha256(char deprecated[(256 >> 3) * 2 + 1],uint8_t hash[256 >> 3],uint8_t *src,int32_t len)
{
    /*
    struct sha256_vstate md;
    sha256_vinit(&md);
    sha256_vprocess(&md,src,len);
    sha256_vdone(&md,hash);
    */

    /*
    uint256 sha256;
    CSHA256().Write((const unsigned char *)src, len).Finalize(sha256.begin());
    for (int i = 0; i < 32; i++) hash[i] = ((uint8_t *)&sha256)[i];
    */

    CSHA256().Write((const unsigned char *)src, len).Finalize(hash);
}

bcz few procedures uses vcalc_sha256 even to check incoming block, so it needs to use fast sha256 implementation in case if we have experimental asm enabled.

[x] Already done.

part 4

  • Probably we have some unexpected / unpredictable behavior (strange side-effect) with this linux_release_CFLAGS: -O1 -> -O2 commit. When wallet built with CXXFLAGS='-g0 -O2' all is ok, when with CXXFLAGS='-g -O2' - it's ok too. But when we tried to build wallet with just CXXFLAGS='-g' in zcutil/build.sh it crashed somewhere in init of CDBEnv. So, i just want to mention it here. In future it should be investigated to find a solution, may be commit should be reverted or additional BDB build flags should be added.

part 5

  • If you want to build under Linux for multiple OSes from the same repo / folder, like, build for Win64 and then build for MacOS - you can do the following:
make clean
make -C src/univalue clean
make -C src/cryptoconditions clean
rm src/qt/moc_*.cpp

after each different build.