我正在尝试学习如何调试rakudo和nqp。所以这是我的第一次尝试:
cd $HOME/debug
git clone https://github.com/rakudo/rakudo.git
cd rakudo
perl Configure.pl --gen-moar --gen-nqp --backends=moar
make
make install # installs into ./install/bin
export PATH=${PWD}/install/bin:$PATH
export PATH=${PWD}/install/share/perl6/site/bin:$PATH
# Testing executable:
perl6 --version
# This is Rakudo version 2018.12-256-g9517c3779 built on MoarVM version 2018.12-36-g34fac5f4e
# implementing Perl 6.d.
#
# Now modifying an nqp file:
cd nqp
# Change a file: E.g. : vim src/HLL/Compiler.nqp
# I added a line after line 293 in src/HLL/Compiler.nqp:
# nqp::say("*** Debugging message: HLL::Compiler::command_eval() ***");
# and save it
make
make install
# Testing perl6 again..
perl6 --version
现在，最后一条命令给出以下异常:
Unhandled exception: Missing or wrong version of dependency 'gen/moar/stage2/NQPHLL.nqp' (from 'src/Perl6/Pod.nqp')
at <unknown>:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/Perl6/Pod.moarvm:<dependencies+deserialize>)
from src/vm/moar/ModuleLoader.nqp:47 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:)
from src/vm/moar/ModuleLoader.nqp:40 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:load_module)
from <unknown>:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/Perl6/Actions.moarvm:<dependencies+deserialize>)
from src/vm/moar/ModuleLoader.nqp:47 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:)
from src/vm/moar/ModuleLoader.nqp:40 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:load_module)
from <unknown>:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/Perl6/Grammar.moarvm:<dependencies+deserialize>)
from src/vm/moar/ModuleLoader.nqp:47 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:)
from src/vm/moar/ModuleLoader.nqp:40 (/home/hakon/debug/rakudo/install/share/nqp/lib/ModuleLoader.moarvm:load_module)
from <unknown>:1 (/home/hakon/debug/rakudo/install/share/perl6/runtime/perl6.moarvm:<dependencies+deserialize>)
h
所以我想，也许我还需要在rakudo上运行
make:cd ..
make
但是这里
make失败并显示:/home/hakon/perlbrew/perls/perl-5.29.3/bin/perl5.29.3 tools/build/check-nqp-version.pl /home/hakon/debug/rakudo/install/bin/nqp-m
/home/hakon/debug/rakudo/install/bin/nqp-m tools/build/gen-cat.nqp moar src/vm/moar/ModuleLoaderVMConfig.nqp src/Perl6/ModuleLoader.nqp > gen/moar/ModuleLoader.nqp
/home/hakon/debug/rakudo/install/bin/nqp-m --module-path=blib --target=mbc --output=blib/Perl6/ModuleLoader.moarvm \
gen/moar/ModuleLoader.nqp
*** Debugging message: HLL::Compiler::command_eval() ***
Confused at line 2, near "*** Debugg"
at gen/moar/stage2/NQPHLL.nqp:811 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:panic)
from gen/moar/stage2/NQP.nqp:921 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:comp_unit)
from gen/moar/stage2/NQP.nqp:782 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:TOP)
from gen/moar/stage2/QRegex.nqp:2300 (/home/hakon/debug/rakudo/install/share/nqp/lib/QRegex.moarvm:parse)
from gen/moar/stage2/NQPHLL.nqp:2031 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:parse)
from gen/moar/stage2/NQPHLL.nqp:1951 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:execute_stage)
from gen/moar/stage2/NQPHLL.nqp:1984 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:run)
from gen/moar/stage2/NQPHLL.nqp:1976 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:)
from gen/moar/stage2/NQPHLL.nqp:1971 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:compile)
from gen/moar/stage2/NQPHLL.nqp:1666 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:eval)
from gen/moar/stage2/NQPHLL.nqp:1889 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:evalfiles)
from gen/moar/stage2/NQPHLL.nqp:1849 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:command_eval)
from gen/moar/stage2/NQPHLL.nqp:1773 (/home/hakon/debug/rakudo/install/share/nqp/lib/NQPHLL.moarvm:command_line)
from gen/moar/stage2/NQP.nqp:4135 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:MAIN)
from gen/moar/stage2/NQP.nqp:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:<mainline>)
from <unknown>:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:<main>)
from <unknown>:1 (/home/hakon/debug/rakudo/install/share/nqp/lib/nqp.moarvm:<entry>)
make: *** [Makefile:457: blib/Perl6/ModuleLoader.moarvm] Error 1
最佳答案
Rakudo构建与用于生成它的NQP构建中的库静态地“链接”，因此修改NQP之后需要重新构建Rakudo。散列用于确保从不使用错误版本的依赖项；如果未检测到这种情况，则极有可能出现极为奇怪的故障模式。
第二个失败是因为Rakudo构建使用一些NQP脚本来预处理一些源文件，然后将这些源文件提供给Perl 6编译器的NQP。它使用>将输出重定向到文件中。因此，您的调试输出将被重定向到该文件，然后-由于它不是有效的源代码-导致生成错误。解决方案是始终在stderr上生成调试输出，例如使用note。
关于raku - 重新编译nqp后的`Missing or wrong version of dependency`，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/54371862/