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--- how [2022/02/23 21:36] – created deva
+++ how [2022/02/26 12:51] – deva
@@ Line 1: / Line 1: @@
 ======The How======
+  * **no** depencencies other than the c++-20 compiler
+  * the ''REG'' macro - automatic ''int a = registerFunction()'' wrapper.
+  * ''std::filesystem'' for reading timestamps
+  * ''execv'', ''posix_spawn'' and friends for executing the compiler, linker and other tools
+  * ''std::async'' for parallel compilation
+  * ''std::thread::hardware_concurrency()'' for automatic ''-jn'' deduction
+  * ''gcc -MMD'' for dependency tracking
+  * ''configure'' target
+    * cross-compilation and tool-chain control
+  * trixy self-re-invoke (after re-compilation) when configuration files change.
+    * tree of self-dependency weirdness:
+        * <code>main()
+    if configure arg call configure(args), exit
+    if reconfigure arg call reconfigure(args), exit
+,3  other rebuildCheck
+    build dirty project sources...
+configure(args)
+  collect (relevant) env vars in map: A
+	collect (relevant) cli args in map: B
+  call generateCache(A, B)
+  then call rebuildCheck to force rebuild and then exit
+reconfigure(args)
+  read A and B from (current) config cache and call generateCache(A, B) to
+	 generate a new one
+  then call rebuildCheck to rebuild and then exit
+rebuildCheck()
+  check if rebuild is needed (if any ctor.cc files or configuration.cc changed):
+	  rebuild
+		if !"only configuration.cc changed" re-run, with "reconfigure" argument
+generateCache(A, B)
+  resolv tool-chain (compiler, linker, etc) and store in map: C
+  run through externals and resolv them, store results in map: D
+	generate config cache .cc file with A, B, C and D
+Scenarios:
+. No ctor deps changed (normal run)
+   rebuild dirty project sources.
+ OK
+. a new configuration.cc has been generated (user called configure)
+   regenerate cache
+ * rebuild
+ OK
+. one or more ctor.cc files changed (run with args)
+ * rebuild
+   relaunch with 'reconfigure' with args (goto 4)
+ OK
+. run with reconfigure (with other args)
+   "ignore" args but keep them for later
+   regenerate cache
+ * rebuild
+   relauch with "other args" (goto 1)
+ OK
+</code>
+  * independent target compilation (with dependency deduction)
+  * ''clean'' target
+  * bootstrapping (yes - libctor compiles itself)
+  * ''check'' target, for unit test compilation and execution
+  * compilation-database (json) for c-lion and others
+  * currently working on:
+    * external dependency flags with ''std::variant''
+        * manual dependency
+        * automatic dependency deduction through searches
+  * future work:
+    * more external dependency variants:
+        * pkg-config
+        * conan
+    * custom target generation through external application (generators)
+    * lambda functions as generators
+    * custom compilation configuration control through ''configure'' target (like ''--with-X''/''--enable-Y'' in autotools)
+    * ''install'' target with ''PREFIX'' and ''DESTDIR'' support
+    * documentation :-)