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Re^2: Where should (or could) a distribution override HARNESS_OPTIONS?

by davido (Archbishop)
on Nov 22, 2012 at 22:09 UTC ( #1005189=note: print w/ replies, xml ) Need Help??


in reply to Re: Where should (or could) a distribution override HARNESS_OPTIONS?
in thread Where should (or could) a distribution override HARNESS_OPTIONS?

Thanks for pointing this out.

You could very easily be right with respect to gcc being allowed to run in parallel. That means we've got another problem. I can't speak for Inline::C's test suite, but I can say that no Inline::CPP test is intentionally reliant on any other test. And to answer your question, Inline::CPP generates within an _Inline directory a new subdirectory for each build's files. Nevertheless, there must be some resource that is getting clobbered, and I should be investigating that instead of looking for a means of preventing parallel testing. More research needed in that area, it seems.

Let's put the Inline::CPP example aside for a moment then, and let the original question stand without any strong example of a module that fits that infinitesimally small category. :)


Dave


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Re^3: Where should (or could) a distribution override HARNESS_OPTIONS?
by afoken (Parson) on Nov 23, 2012 at 05:30 UTC
    Inline::CPP generates within an _Inline directory a new subdirectory for each build's files.

    What is a "build" in this context? I.e. do we have one subdirectory per invokation of a test script, one subdirectory per test script, or one per Inline::CPP version? How are the names of the subdirectories calculated (what are the input parameters for the function that returns the subdirectory name)?

    Idea behind the last question: two test scripts, both use a common module that uses Inline:CPP, subdirectory name depends only on that module. Two gccs fight in the same subdirectory.

    (I should really install some Inline::* modules. But it's 6:30 am and it will be a long day at $work. No time for fun ...)

    Alexander

    --
    Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

      "build" refers to Inline creating a module in _Inline (like h2xs) and making it at use/BEGIN time (perl Makefile.PL/make install), before your program runs, ex

      $ perl def.pl validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Writing Makefile for def_pl_38b1 Writing MYMETA.yml and MYMETA.json Finished "perl Makefile.PL" Stage Starting "make" Stage C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe C:\perl\site\5.14 +.1\lib\ExtUtils\xsubpp -typemap "C:\perl\5.14.1\l ib\ExtUtils\typemap" def_pl_38b1.xs > def_pl_38b1.xsc && C:\perl\5.14 +.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtil s::Command -e mv -- def_pl_38b1.xsc def_pl_38b1.c gcc -c -I"D:/soInline" -s -O2 -DWIN32 -DPERL_TEXTMODE_SCRIPTS - +DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_S YS -fno-strict-aliasing -mms-bitfields -s -O2 -DVERSION=\"0.00\" + -DXS_VERSION=\"0.00\" "-IC:\perl\5.14.1\lib\MSW in32-x86-multi-thread\CORE" def_pl_38b1.c Running Mkbootstrap for def_pl_38b1 () C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 def_pl_38b1.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Mksym +lists \ -e "Mksymlists('NAME'=>\"def_pl_38b1\", 'DLBASE' => 'def_pl_38b1' +, 'DL_FUNCS' => { }, 'FUNCLIST' => [], 'IMPORTS' => { }, 'DL_VARS' => []);" dlltool --def def_pl_38b1.def --output-exp dll.exp g++ -o blib\arch\auto\def_pl_38b1\def_pl_38b1.dll -Wl,--base-file -Wl, +dll.base -mdll -s -L"c:\perl\5.14.1\lib\MSWin32-x8 6-multi-thread\CORE" -L"C:\MinGW\lib" def_pl_38b1.o C:\perl\5.14.1\l +ib\MSWin32-x86-multi-thread\CORE\libperl514.a -lmo ldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -l +shell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2 _32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp dlltool --def def_pl_38b1.def --base-file dll.base --output-exp dll.ex +p g++ -o blib\arch\auto\def_pl_38b1\def_pl_38b1.dll -mdll -s -L"c:\perl\ +5.14.1\lib\MSWin32-x86-multi-thread\CORE" -L"C:\Mi nGW\lib" def_pl_38b1.o C:\perl\5.14.1\lib\MSWin32-x86-multi-thread\C +ORE\libperl514.a -lmoldname -lkernel32 -luser32 -l gdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -l +netapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion - lodbc32 -lodbccp32 -lcomctl32 dll.exp C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 755 blib\arch\auto\def_pl_38b1\def_ pl_38b1.dll C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e cp -- def_pl_38b1.bs blib\arch\auto\def_pl_3 8b1\def_pl_38b1.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 blib\arch\auto\def_pl_38b1\def_ pl_38b1.bs Finished "make" Stage Starting "make install" Stage Files found in blib\arch: installing files in blib\lib into architectu +re dependent library tree Installing D:\soInline\_Inline\lib\auto\def_pl_38b1\def_pl_38b1.bs Installing D:\soInline\_Inline\lib\auto\def_pl_38b1\def_pl_38b1.dll Finished "make install" Stage Starting Cleaning Up Stage Finished Cleaning Up Stage Finished Build Compile Stage SV = IV(0x99aa48) at 0x99aa4c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 123 SV = IV(0x99aa48) at 0x99aa4c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 1 $ perl notdef.pl validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Writing Makefile for modSV Writing MYMETA.yml and MYMETA.json Finished "perl Makefile.PL" Stage Starting "make" Stage C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe C:\perl\site\5.14 +.1\lib\ExtUtils\xsubpp -typemap "C:\perl\5.14.1\l ib\ExtUtils\typemap" modSV.xs > modSV.xsc && C:\perl\5.14.1\bin\MSWin +32-x86-multi-thread\perl.exe -MExtUtils::Command - e mv -- modSV.xsc modSV.c gcc -c -I"D:/soInline" -s -O2 -DWIN32 -DPERL_TEXTMODE_SCRIPTS - +DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_S YS -fno-strict-aliasing -mms-bitfields -s -O2 -DVERSION=\"0.00\" + -DXS_VERSION=\"0.00\" "-IC:\perl\5.14.1\lib\MSW in32-x86-multi-thread\CORE" modSV.c Running Mkbootstrap for modSV () C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 modSV.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Mksym +lists \ -e "Mksymlists('NAME'=>\"modSV\", 'DLBASE' => 'modSV', 'DL_FUNCS' + => { }, 'FUNCLIST' => [], 'IMPORTS' => { }, 'DL _VARS' => []);" dlltool --def modSV.def --output-exp dll.exp g++ -o blib\arch\auto\modSV\modSV.dll -Wl,--base-file -Wl,dll.base -md +ll -s -L"c:\perl\5.14.1\lib\MSWin32-x86-multi-thre ad\CORE" -L"C:\MinGW\lib" modSV.o C:\perl\5.14.1\lib\MSWin32-x86-mul +ti-thread\CORE\libperl514.a -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -l +oleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp dlltool --def modSV.def --base-file dll.base --output-exp dll.exp g++ -o blib\arch\auto\modSV\modSV.dll -mdll -s -L"c:\perl\5.14.1\lib\M +SWin32-x86-multi-thread\CORE" -L"C:\MinGW\lib" mod SV.o C:\perl\5.14.1\lib\MSWin32-x86-multi-thread\CORE\libperl514.a - +lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool - lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -l +ws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 755 blib\arch\auto\modSV\modSV.dll C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e cp -- modSV.bs blib\arch\auto\modSV\modSV.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 blib\arch\auto\modSV\modSV.bs Finished "make" Stage Starting "make install" Stage Files found in blib\arch: installing files in blib\lib into architectu +re dependent library tree Installing D:\soInline\_Inline\lib\auto\modSV\modSV.bs Installing D:\soInline\_Inline\lib\auto\modSV\modSV.dll Finished "make install" Stage Starting Cleaning Up Stage Finished Cleaning Up Stage Finished Build Compile Stage SV = IV(0xc39248) at 0xc3924c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 123 SV = IV(0xc39248) at 0xc3924c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 1

      subsequent runs don't "build"

      unless the c-source changes

      $ perl -le " print qq{\n/* blah */\n\n} " >> modsv.c $ perl def.pl validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Writing Makefile for def_pl_4ff5 Writing MYMETA.yml and MYMETA.json Finished "perl Makefile.PL" Stage Starting "make" Stage C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe C:\perl\site\5.14 +.1\lib\ExtUtils\xsubpp -typemap "C:\perl\5.14.1\l ib\ExtUtils\typemap" def_pl_4ff5.xs > def_pl_4ff5.xsc && C:\perl\5.14 +.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtil s::Command -e mv -- def_pl_4ff5.xsc def_pl_4ff5.c gcc -c -I"D:/soInline" -s -O2 -DWIN32 -DPERL_TEXTMODE_SCRIPTS - +DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_S YS -fno-strict-aliasing -mms-bitfields -s -O2 -DVERSION=\"0.00\" + -DXS_VERSION=\"0.00\" "-IC:\perl\5.14.1\lib\MSW in32-x86-multi-thread\CORE" def_pl_4ff5.c Running Mkbootstrap for def_pl_4ff5 () C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 def_pl_4ff5.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Mksym +lists \ -e "Mksymlists('NAME'=>\"def_pl_4ff5\", 'DLBASE' => 'def_pl_4ff5' +, 'DL_FUNCS' => { }, 'FUNCLIST' => [], 'IMPORTS' => { }, 'DL_VARS' => []);" dlltool --def def_pl_4ff5.def --output-exp dll.exp g++ -o blib\arch\auto\def_pl_4ff5\def_pl_4ff5.dll -Wl,--base-file -Wl, +dll.base -mdll -s -L"c:\perl\5.14.1\lib\MSWin32-x8 6-multi-thread\CORE" -L"C:\MinGW\lib" def_pl_4ff5.o C:\perl\5.14.1\l +ib\MSWin32-x86-multi-thread\CORE\libperl514.a -lmo ldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -l +shell32 -lole32 -loleaut32 -lnetapi32 -luuid -lws2 _32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp dlltool --def def_pl_4ff5.def --base-file dll.base --output-exp dll.ex +p g++ -o blib\arch\auto\def_pl_4ff5\def_pl_4ff5.dll -mdll -s -L"c:\perl\ +5.14.1\lib\MSWin32-x86-multi-thread\CORE" -L"C:\Mi nGW\lib" def_pl_4ff5.o C:\perl\5.14.1\lib\MSWin32-x86-multi-thread\C +ORE\libperl514.a -lmoldname -lkernel32 -luser32 -l gdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -l +netapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion - lodbc32 -lodbccp32 -lcomctl32 dll.exp C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 755 blib\arch\auto\def_pl_4ff5\def_ pl_4ff5.dll C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e cp -- def_pl_4ff5.bs blib\arch\auto\def_pl_4 ff5\def_pl_4ff5.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 blib\arch\auto\def_pl_4ff5\def_ pl_4ff5.bs Finished "make" Stage Starting "make install" Stage Files found in blib\arch: installing files in blib\lib into architectu +re dependent library tree Installing D:\soInline\_Inline\lib\auto\def_pl_4ff5\def_pl_4ff5.bs Installing D:\soInline\_Inline\lib\auto\def_pl_4ff5\def_pl_4ff5.dll Finished "make install" Stage Starting Cleaning Up Stage Finished Cleaning Up Stage Finished Build Compile Stage SV = IV(0x99aa48) at 0x99aa4c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 123 SV = IV(0x99aa48) at 0x99aa4c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 1 $ perl notdef.pl validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Writing Makefile for modSV Writing MYMETA.yml and MYMETA.json Finished "perl Makefile.PL" Stage Starting "make" Stage C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe C:\perl\site\5.14 +.1\lib\ExtUtils\xsubpp -typemap "C:\perl\5.14.1\l ib\ExtUtils\typemap" modSV.xs > modSV.xsc && C:\perl\5.14.1\bin\MSWin +32-x86-multi-thread\perl.exe -MExtUtils::Command - e mv -- modSV.xsc modSV.c gcc -c -I"D:/soInline" -s -O2 -DWIN32 -DPERL_TEXTMODE_SCRIPTS - +DPERL_IMPLICIT_CONTEXT -DPERL_IMPLICIT_S YS -fno-strict-aliasing -mms-bitfields -s -O2 -DVERSION=\"0.00\" + -DXS_VERSION=\"0.00\" "-IC:\perl\5.14.1\lib\MSW in32-x86-multi-thread\CORE" modSV.c Running Mkbootstrap for modSV () C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 modSV.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Mksym +lists \ -e "Mksymlists('NAME'=>\"modSV\", 'DLBASE' => 'modSV', 'DL_FUNCS' + => { }, 'FUNCLIST' => [], 'IMPORTS' => { }, 'DL _VARS' => []);" dlltool --def modSV.def --output-exp dll.exp g++ -o blib\arch\auto\modSV\modSV.dll -Wl,--base-file -Wl,dll.base -md +ll -s -L"c:\perl\5.14.1\lib\MSWin32-x86-multi-thre ad\CORE" -L"C:\MinGW\lib" modSV.o C:\perl\5.14.1\lib\MSWin32-x86-mul +ti-thread\CORE\libperl514.a -lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -l +oleaut32 -lnetapi32 -luuid -lws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp dlltool --def modSV.def --base-file dll.base --output-exp dll.exp g++ -o blib\arch\auto\modSV\modSV.dll -mdll -s -L"c:\perl\5.14.1\lib\M +SWin32-x86-multi-thread\CORE" -L"C:\MinGW\lib" mod SV.o C:\perl\5.14.1\lib\MSWin32-x86-multi-thread\CORE\libperl514.a - +lmoldname -lkernel32 -luser32 -lgdi32 -lwinspool - lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -lnetapi32 -luuid -l +ws2_32 -lmpr -lwinmm -lversion -lodbc32 -lodbccp32 -lcomctl32 dll.exp C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 755 blib\arch\auto\modSV\modSV.dll C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e cp -- modSV.bs blib\arch\auto\modSV\modSV.bs C:\perl\5.14.1\bin\MSWin32-x86-multi-thread\perl.exe -MExtUtils::Comma +nd -e chmod -- 644 blib\arch\auto\modSV\modSV.bs Finished "make" Stage Starting "make install" Stage Files found in blib\arch: installing files in blib\lib into architectu +re dependent library tree Installing D:\soInline\_Inline\lib\auto\modSV\modSV.dll Finished "make install" Stage Starting Cleaning Up Stage Finished Cleaning Up Stage Finished Build Compile Stage SV = IV(0xc39248) at 0xc3924c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 123 SV = IV(0xc39248) at 0xc3924c REFCNT = 1 FLAGS = (PADMY,IOK,pIOK) IV = 1

      The resulting directory structure

      $ tree -f -a _Inline _Inline |-- _Inline/build | `-- _Inline/build/modSV | |-- _Inline/build/modSV/INLINE.h | |-- _Inline/build/modSV/MYMETA.json | |-- _Inline/build/modSV/MYMETA.yml | |-- _Inline/build/modSV/Makefile | |-- _Inline/build/modSV/Makefile.PL | |-- _Inline/build/modSV/blib | | |-- _Inline/build/modSV/blib/arch | | | |-- _Inline/build/modSV/blib/arch/.exists | | | `-- _Inline/build/modSV/blib/arch/auto | | | `-- _Inline/build/modSV/blib/arch/auto/modSV | | | |-- _Inline/build/modSV/blib/arch/auto/modSV/. +exists | | | |-- _Inline/build/modSV/blib/arch/auto/modSV/m +odSV.bs | | | `-- _Inline/build/modSV/blib/arch/auto/modSV/m +odSV.dll | | |-- _Inline/build/modSV/blib/bin | | | `-- _Inline/build/modSV/blib/bin/.exists | | |-- _Inline/build/modSV/blib/lib | | | |-- _Inline/build/modSV/blib/lib/.exists | | | `-- _Inline/build/modSV/blib/lib/auto | | | `-- _Inline/build/modSV/blib/lib/auto/modSV | | | `-- _Inline/build/modSV/blib/lib/auto/modSV/.e +xists | | |-- _Inline/build/modSV/blib/man1 | | | `-- _Inline/build/modSV/blib/man1/.exists | | |-- _Inline/build/modSV/blib/man3 | | | `-- _Inline/build/modSV/blib/man3/.exists | | `-- _Inline/build/modSV/blib/script | | `-- _Inline/build/modSV/blib/script/.exists | |-- _Inline/build/modSV/dll.base | |-- _Inline/build/modSV/dll.exp | |-- _Inline/build/modSV/modSV.bs | |-- _Inline/build/modSV/modSV.c | |-- _Inline/build/modSV/modSV.def | |-- _Inline/build/modSV/modSV.o | |-- _Inline/build/modSV/modSV.xs | |-- _Inline/build/modSV/modSV_def.old | `-- _Inline/build/modSV/pm_to_blib |-- _Inline/config-MSWin32-x86-multi-thread-5.014001 `-- _Inline/lib `-- _Inline/lib/auto |-- _Inline/lib/auto/def_pl_38b1 | |-- _Inline/lib/auto/def_pl_38b1/def_pl_38b1.bs | |-- _Inline/lib/auto/def_pl_38b1/def_pl_38b1.dll | `-- _Inline/lib/auto/def_pl_38b1/def_pl_38b1.inl |-- _Inline/lib/auto/def_pl_4ff5 | |-- _Inline/lib/auto/def_pl_4ff5/def_pl_4ff5.bs | |-- _Inline/lib/auto/def_pl_4ff5/def_pl_4ff5.dll | `-- _Inline/lib/auto/def_pl_4ff5/def_pl_4ff5.inl `-- _Inline/lib/auto/modSV |-- _Inline/lib/auto/modSV/.packlist |-- _Inline/lib/auto/modSV/modSV.bs |-- _Inline/lib/auto/modSV/modSV.dll `-- _Inline/lib/auto/modSV/modSV.inl 18 directories, 35 files

      The _Inline/build directory usually gets cleaned up, but not for notdef.pl

      notdef.pl also NAME's the module, so its name doesn't change, but def.pl doesn't NAME the module, so a name is derived from the filename (def.pl) and the md5 sum of the c-source code

      $ cat _Inline\lib\auto\def_pl_4ff5\def_pl_4ff5.inl md5 : 4ff5a29496365b6167324b7d80efb321 name : def_pl_4ff5 version : "" language : C language_id : C installed : 0 date_compiled : Thu Nov 22 21:58:12 2012 inline_version : 0.5 ILSM : % module : Inline::C suffix : dll type : compiled Config : % apiversion : ? archname : MSWin32-x86-multi-thread cc : gcc ccflags : " -s -O2 -DWIN32 -DPERL_TEXTMODE_SCRIPTS -DPERL_IMPLICI +T_CONTEXT -DPERL_IMPLICIT_SYS -fno-strict-aliasing -mms-bitfields" ld : g++ osname : MSWin32 osvers : 5.1 so : dll version : 5.14.1

      Now, can two copies of notdef.pl run simultaneously? Lets see

      First cleanup  $ rm -rfv _Inline

      And one copy will trip over the other and die , the other will continue normally

      $ perl -le " system 1, $^X, q,notdef.pl, for 1,2 " $ validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage validate Stage Starting Build Preprocess Stage get_maps Stage Finished Build Preprocess Stage Starting Build Parse Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Parse Stage Starting Build Glue 1 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 1 Stage Starting Build Glue 2 Stage Finished Build Glue 2 Stage Starting Build Glue 3 Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Finished Build Glue 3 Stage Starting Build Compile Stage Starting "perl Makefile.PL" Stage Writing Makefile for modSV Writing Makefile for modSV Writing MYMETA.yml and MYMETA.json Can't open Makefile for input: No such file or directory at notdef.pl line 8. BEGIN failed--compilation aborted at notdef.pl line 8. Writing MYMETA.yml and MYMETA.json Finished "perl Makefile.PL" Stage Starting "make" Stage ...

      Now I'm not sure what scenario davido is talking about in the OP, but I hope this helps

      FWIW, def.pl/notdef.pl are derived from XS: returning a 64-bit unsigned int?/Re: Inline::C with multiple *.c

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