{"id":37084,"date":"2019-10-31T22:15:40","date_gmt":"2019-10-31T19:15:40","guid":{"rendered":"https:\/\/prohoster.info\/blog\/c-i-cmake-bratya-navek-chast-ii\/"},"modified":"2019-10-31T22:15:40","modified_gmt":"2019-10-31T19:15:40","slug":"c-i-cmake-bratya-navek-chast-ii","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/administrirovanie\/c-i-cmake-bratya-navek-chast-ii","title":{"rendered":"C++ e CMake \u2014 fratelli per sempre, parte II","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"C++ e CMake \u2014 fratelli per sempre, parte II\" src=\"\/wp-content\/uploads\/2019\/08\/1d86b8b1668ae29ff3e634df9059d9b1.png\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/461817\/\">Nella parte precedente<\/a><\/noindex> di questa interessante narrazione si parlava dell'organizzazione di una libreria di intestazione all'interno del generatore di sistemi di build CMake.<\/p>\n<p><\/p>\n<p>Questa volta aggiungeremo una libreria compilata e discuteremo della composizione dei moduli tra di loro.<\/p>\n<p><\/p>\n<blockquote><p>Come prima, coloro che non possono aspettare possono subito <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/izvolov\/mylib\">andare al repository aggiornato<\/a><\/noindex> e toccare tutto con mano.<\/p><\/blockquote>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\n<noindex><a rel=\"nofollow\" name=\"contents\"><\/a><\/noindex><\/p>\n<h2>Contenuto<\/h2>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"#divide\">Dividi<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"#impera\">Domina<\/a><\/noindex><\/li>\n<\/ol>\n<p>\n<noindex><a rel=\"nofollow\" name=\"divide\"><\/a><\/noindex><\/p>\n<h2><noindex><a rel=\"nofollow\" href=\"#contents\">Dividi<\/a><\/noindex><\/h2>\n<p><\/p>\n<p>La prima cosa da fare per raggiungere il nostro grande obiettivo \u00e8 dividere il software in blocchi isolati e universali, omogenei dal punto di vista dell'utente.<\/p>\n<p><\/p>\n<p>Nella prima parte \u00e8 stato descritto un tale blocco standard \u2014 un progetto con una libreria di intestazione. Ora aggiungeremo al nostro progetto una libreria compilata.<\/p>\n<p><\/p>\n<p>Per fare ci\u00f2, estrarremo l'implementazione della funzione <code>myfunc<\/code> in un file <code>.cpp<\/code>-file:<\/p>\n<p><\/p>\n<pre><code class=\"diff\">diff --git a\/include\/mylib\/myfeature.hpp b\/include\/mylib\/myfeature.hpp\nindex 43db388..ba62b4f 100644\n--- a\/include\/mylib\/myfeature.hpp\n+++ b\/include\/mylib\/myfeature.hpp\n@@ -46,8 +46,5 @@ namespace mylib\n\n         ~  see mystruct\n      *\/\n-    inline bool myfunc (mystruct)\n-    {\n-        return true;\n-    }\n+    bool myfunc (mystruct);\n }\ndiff --git a\/src\/mylib\/myfeature.cpp b\/src\/mylib\/myfeature.cpp\nnew file mode 100644\nindex 0000000..abb5004\n--- \/dev\/null\n+++ b\/src\/mylib\/myfeature.cpp\n@@ -0,0 +1,9 @@\n+#include \n+\n+namespace mylib\n+{\n+    bool myfunc (mystruct)\n+    {\n+        return true;\n+    }\n+}<\/code><\/pre>\n<p><\/p>\n<p>Poi definiremo la libreria compilabile (<code>myfeature<\/code>), che sar\u00e0 composta dal file ottenuto nel passaggio precedente <code>.cpp<\/code>-file. La nuova libreria richiede evidentemente gli header esistenti e, per garantire ci\u00f2, \u00e8 necessario e utile collegarla con l'obiettivo esistente <code>mylib<\/code>. Inoltre, il collegamento tra di loro \u00e8 pubblico, il che significa che tutto ci\u00f2 che sar\u00e0 collegato all'obiettivo <code>myfeature<\/code>, ricever\u00e0 automaticamente anche l'obiettivo <code>mylib<\/code> (<noindex><a rel=\"nofollow\" href=\"https:\/\/cmake.org\/cmake\/help\/v3.14\/command\/target_link_libraries.html#libraries-for-a-target-and-or-its-dependents\">ulteriori informazioni sui metodi di collegamento<\/a><\/noindex>). <\/p>\n<p><\/p>\n<pre><code class=\"diff\">diff --git a\/CMakeLists.txt b\/CMakeLists.txt\nindex 108045c..0de77b8 100644\n--- a\/CMakeLists.txt\n+++ b\/CMakeLists.txt\n@@ -64,6 +64,17 @@ target_compile_features(mylib INTERFACE cxx_std_17)\n\n add_library(Mylib::mylib ALIAS mylib)\n\n+###################################################################################################\n+##\n+##      Biblioteca compilata\n+##\n+###################################################################################################\n+\n+add_library(myfeature src\/mylib\/myfeature.cpp)\n+target_link_libraries(myfeature PUBLIC mylib)\n+\n+add_library(Mylib::myfeature ALIAS myfeature)\n+<\/code><\/pre>\n<p><\/p>\n<p>Adesso faremo in modo che la nuova biblioteca venga installata nel sistema:<\/p>\n<p><\/p>\n<pre><code class=\"diff\">@@ -72,7 +83,7 @@ add_library(Mylib::mylib ALIAS mylib)\n\n install(DIRECTORY include\/mylib DESTINATION include)\n\n-install(TARGETS mylib EXPORT MylibConfig)\n+install(TARGETS mylib myfeature EXPORT MylibConfig)\n install(EXPORT MylibConfig NAMESPACE Mylib:: DESTINATION share\/Mylib\/cmake)\n\n include(CMakePackageConfigHelpers)<\/code><\/pre>\n<p><\/p>\n<p>\u00c8 importante notare che per l'obiettivo <code>myfeature<\/code>, cos\u00ec come per <code>mylib<\/code> \u00e8 stato creato un alias con il prefisso <code>Mylib::<\/code>. Lo stesso \u00e8 stato definito per entrambi gli obiettivi durante l'esportazione per l'installazione nel sistema. Questo consente un utilizzo uniforme degli obiettivi con qualsiasi <noindex><a rel=\"nofollow\" href=\"#impera\">schema di collegamento<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p>Dopo di ci\u00f2, resta da connettere i test modulari con la nuova biblioteca (la funzione <code>myfunc<\/code> \u00e8 stata spostata dall'intestazione, quindi ora \u00e8 necessario linkare):<\/p>\n<p><\/p>\n<pre><code class=\"diff\">diff --git a\/test\/CMakeLists.txt b\/test\/CMakeLists.txt\nindex 5620be4..bc1266c 100644\n--- a\/test\/CMakeLists.txt\n+++ b\/test\/CMakeLists.txt\n@@ -4,7 +4,7 @@ add_executable(mylib-unit-tests test_main.cpp)\n target_sources(mylib-unit-tests PRIVATE mylib\/myfeature.cpp)\n target_link_libraries(mylib-unit-tests\n     PRIVATE\n-        Mylib::mylib\n+        Mylib::myfeature\n         doctest::doctest\n )<\/code><\/pre>\n<p><\/p>\n<p>Intestazioni (<code>Mylib::mylib<\/code>) non deve pi\u00f9 essere collegato separatamente, perch\u00e9, come gi\u00e0 detto, viene collegato automaticamente insieme alla libreria (<code>Mylib::myfeature<\/code>).<\/p>\n<p><\/p>\n<p>Aggiungiamo anche alcuni dettagli per garantire la misurazione della copertura tenendo conto della nuova libreria:<\/p>\n<p><\/p>\n<pre><code class=\"diff\">@@ -15,11 +15,16 @@ if(MYLIB_COVERAGE AND GCOVR_EXECUTABLE)\n     target_compile_options(mylib-unit-tests PRIVATE --coverage)\n     target_link_libraries(mylib-unit-tests PRIVATE gcov)\n\n+    target_compile_options(myfeature PRIVATE --coverage)\n+    target_link_libraries(myfeature PRIVATE gcov)\n+\n     add_custom_target(coverage\n         COMMAND\n             ${GCOVR_EXECUTABLE}\n-                --root=${PROJECT_SOURCE_DIR}\/include\/\n-                --object-directory=${CMAKE_CURRENT_BINARY_DIR}\n+                --root=${PROJECT_SOURCE_DIR}\/\n+                --filter=${PROJECT_SOURCE_DIR}\/include\n+                --filter=${PROJECT_SOURCE_DIR}\/src\n+                --object-directory=${PROJECT_BINARY_DIR}\n         DEPENDS\n             check\n     )<\/code><\/pre>\n<p><\/p>\n<p>\u00c8 possibile aggiungere pi\u00f9 librerie, file eseguibili, ecc. Non importa come siano collegati all'interno del progetto. L'importante \u00e8 quali obiettivi costituiscono l'interfaccia del nostro modulo, cio\u00e8 quelli visibili esternamente.<\/p>\n<p>\n<noindex><a rel=\"nofollow\" name=\"impera\"><\/a><\/noindex><\/p>\n<h2><noindex><a rel=\"nofollow\" href=\"#contents\">Domina<\/a><\/noindex><\/h2>\n<p><\/p>\n<p>Ora abbiamo moduli standard e possiamo controllarli: creare strutture di qualsiasi complessit\u00e0, installandoli nel sistema o collegandoli tra loro all'interno di un'unica struttura di assemblaggio.<\/p>\n<p><\/p>\n<h3 id=\"ustanovka-v-sistemu\">Installazione nel sistema<\/h3>\n<p><\/p>\n<p>Una delle opzioni per utilizzare il modulo \u00e8 installare il nostro modulo nel sistema.<\/p>\n<p><\/p>\n<pre><code class=\"plaintext\">cmake --build percorso\/alla\/directory\/di\/build --target install<\/code><\/pre>\n<p><\/p>\n<p>Dopo di ci\u00f2 pu\u00f2 essere collegato a qualsiasi altro progetto usando il comando <noindex><a rel=\"nofollow\" href=\"https:\/\/cmake.org\/cmake\/help\/v3.14\/command\/find_package.html\"><code>find_package<\/code><\/a><\/noindex>.<\/p>\n<p><\/p>\n<pre><code class=\"cmake\">find_package(Mylib 1.0 REQUIRED)<\/code><\/pre>\n<p><\/p>\n<h3 id=\"podklyuchenie-v-kachestve-podmodulya\">Collegamento come sott modulo<\/h3>\n<p><\/p>\n<p>Un'altra opzione \u00e8 collegare la cartella del nostro progetto a un altro progetto come sott modulo usando il comando <noindex><a rel=\"nofollow\" href=\"https:\/\/cmake.org\/cmake\/help\/v3.14\/command\/add_subdirectory.html\"><code>add_subdirectory<\/code><\/a><\/noindex>.<\/p>\n<p><\/p>\n<h3 id=\"ispolzovanie\">L'utilizzo di<\/h3>\n<p><\/p>\n<p>Le modalit\u00e0 di collegamento sono varie, ma il risultato \u00e8 lo stesso. In entrambi i casi, nel progetto che utilizza il nostro modulo, saranno disponibili obiettivi <code>Mylib::myfeature<\/code> e <code>Mylib::mylib<\/code>, che possono essere utilizzati, ad esempio, in questo modo:<\/p>\n<p><\/p>\n<pre><code class=\"cmake\">add_executable(some_executable some.cpp sources.cpp)\ntarget_link_libraries(some_executable PRIVATE Mylib::myfeature)<\/code><\/pre>\n<p><\/p>\n<p>Nel nostro caso, la libreria <code>Mylib::myfeature<\/code> deve essere collegata quando \u00e8 necessario collegarsi alla libreria <code>libmyfeature<\/code>. Se sono sufficienti solo gli header, \u00e8 meglio utilizzare la libreria <code>Mylib::mylib<\/code>.<\/p>\n<p><\/p>\n<p>Gli obiettivi di CMake possono essere ingannevoli, ad esempio, progettati solo per propagare alcune propriet\u00e0, dipendenze, e cos\u00ec via. Il lavoro con essi avviene in modo uniforme.<\/p>\n<p><\/p>\n<p>Ci\u00f2 che si voleva ottenere.<\/p>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/463295\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0447\u0430\u0441\u0442\u0438 \u0434\u0430\u043d\u043d\u043e\u0433\u043e \u0437\u0430\u043d\u0438\u043c\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u0441\u043a\u0430\u0437\u0430 \u0433\u043e\u0432\u043e\u0440\u0438\u043b\u043e\u0441\u044c \u043e\u0431 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u0430\u0446\u0438\u0438 \u0437\u0430\u0433\u043e\u043b\u043e\u0432\u043e\u0447\u043d\u043e\u0439 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0432 \u0440\u0430\u043c\u043a\u0430\u0445 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \u0441\u0438\u0441\u0442\u0435\u043c \u0441\u0431\u043e\u0440\u043a\u0438 CMake. \u0412 \u044d\u0442\u043e\u0442 \u0440\u0430\u0437 \u0434\u043e\u0431\u0430\u0432\u0438\u043c \u043a \u043d\u0435\u043c\u0443 \u043a\u043e\u043c\u043f\u0438\u043b\u0438\u0440\u0443\u0435\u043c\u0443\u044e \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443, \u0430 \u0442\u0430\u043a\u0436\u0435 \u043f\u043e\u0433\u043e\u0432\u043e\u0440\u0438\u043c \u043e \u043a\u043e\u043c\u043f\u043e\u043d\u043e\u0432\u043a\u0435 \u043c\u043e\u0434\u0443\u043b\u0435\u0439 \u0434\u0440\u0443\u0433 \u0441 \u0434\u0440\u0443\u0433\u043e\u043c. \u041a\u0430\u043a \u0438 \u043f\u0440\u0435\u0436\u0434\u0435, \u0442\u0435\u043c, \u043a\u043e\u043c\u0443 \u043d\u0435 \u0442\u0435\u0440\u043f\u0438\u0442\u0441\u044f, \u043c\u043e\u0433\u0443\u0442 \u0441\u0440\u0430\u0437\u0443 \u043f\u0435\u0440\u0435\u0439\u0442\u0438 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0451\u043d\u043d\u044b\u0439 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 \u0438 \u043f\u043e\u0442\u0440\u043e\u0433\u0430\u0442\u044c \u0432\u0441\u0451 \u0441\u0432\u043e\u0438\u043c\u0438 \u0440\u0443\u043a\u0430\u043c\u0438. \u0421\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435 \u0420\u0430\u0437\u0434\u0435\u043b\u044f\u0439 \u0412\u043b\u0430\u0441\u0442\u0432\u0443\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":27802,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-37084","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 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