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P.S. I think you should also send a message to syphilis too about this last error.

Which error is that ?

I don't understand how it happens that the XS module Test::LeakTrace is fine for the OP, but the XS module List::MoreUtils::XS is not.
I keep thinking that should be giving us a clue ... but I don't see any clues.
I compared the way both modules built on the OP's perl-5.30.3 and both build in essentially the same way. In the (below) copy'n'paste, the first line of each pair of lines is from the Test::LeakTrace build, the second line is from the List::MoreUtils::XS build:
Running Mkbootstrap for LeakTrace () Running Mkbootstrap for XS () chmod 644 "LeakTrace.bs" chmod 644 "XS.bs" "/home/rg8239/perl/bin/perl" "-Iinc" -MExtUtils::Command::MM -e 'cp_no +nempty' -- LeakTrace.bs blib/arch/auto/Test/LeakTrace/LeakTrace.bs 64 +4 "/home/rg8239/perl/bin/perl" -MExtUtils::Command::MM -e 'cp_no +nempty' -- XS.bs blib/arch/auto/List/MoreUtils/XS/XS.bs 644 "/home/rg8239/perl/bin/perl" "-Iinc" "/home/rg8239/perl/lib/5.30.3/Ext +Utils/xsubpp" -typemap '/home/rg8239/perl/lib/5.30.3/ExtUtils/typema +p' LeakTrace.xs > LeakTrace.xsc "/home/rg8239/perl/bin/perl" "/home/rg8239/perl/lib/5.30.3/Ext +Utils/xsubpp" -typemap '/home/rg8239/perl/lib/5.30.3/ExtUtils/typema +p' XS.xs > XS.xsc mv LeakTrace.xsc LeakTrace.c mv XS.xsc XS.c gcc -c -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFI +LE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DVERSION=\"0.16\" -DXS_VERSI +ON=\"0.16\" -fPIC "-I/home/rg8239/perl/lib/5.30.3/x86_64-linux/CORE" + LeakTrace.c gcc -c -I. -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFI +LE_SOURCE -D_FILE_OFFSET_BITS=64 -O2 -DVERSION=\"0.428\" -DXS_VERSI +ON=\"0.428\" -fPIC "-I/home/rg8239/perl/lib/5.30.3/x86_64-linux/CORE" + XS.c rm -f blib/arch/auto/Test/LeakTrace/LeakTrace.so rm -f blib/arch/auto/List/MoreUtils/XS/XS.so gcc -shared -O2 -L/usr/local/lib LeakTrace.o -o blib/arch/auto/Test +/LeakTrace/LeakTrace.so \ gcc -shared -O2 -L/usr/local/lib XS.o -o blib/arch/auto/List +/MoreUtils/XS/XS.so \ \ \ chmod 755 blib/arch/auto/Test/LeakTrace/LeakTrace.so chmod 755 blib/arch/auto/List/MoreUtils/XS/XS.so Manifying 3 pod documents Manifying 1 pod document LEEJO/Test-LeakTrace-0.16.tar.gz REHSACK/List-MoreUtils-XS-0.428.tar.gz /usr/bin/make -- OK /usr/bin/make -- OK
In both cases we see the same process, and the same flags - yet one results in a runtime mismatch and the other doesn't.
The L::MU::XS build inserts a -I. in a couple of spots (needed to load headers that are located in the L::MU::XS top-level source directory), and the T::LT build inserts a "-Iinc" in a couple of spots - but I don't see anything telling in those minor differences.
And, apart from those 2 minor discrepancies, the builds are identical.
How can one module incur a mismatch, and the other not ?

Cheers,
Rob

In reply to Re^8: XS.c: loadable library and perl binaries are mismatched (got handshake key 0xc100000, needed 0xc180000) by syphilis
in thread XS.c: loadable library and perl binaries are mismatched (got handshake key 0xc100000, needed 0xc180000) by rgren925

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