gitignore cleanup (#1672)

.gitignore

@@ -6,9 +6,6 @@
 *~
 *.swp
 
-# C stuff
-*.o
-
 # Windows stuff
 *.obj
 *.exe
@@ -26,17 +23,6 @@
 # gdb stuff
 .gdb_history
 
-# Autotools stuff
-.deps
-.dirstamp
-Makefile
-Makefile.in
-
-# Libtool stuff
-.libs
-*.lo
-*.la
-
 # ctags stuff
 TAGS
 tags
@@ -45,93 +31,105 @@ tags
 cscope*
 
 # Stuff made by our makefiles
-*.pc
-*.log
 *.trs
 
-## The initial / makes these files only get ignored in particular directories.
-/autom4te.cache
-
 # configure in progress
+*.err
+*.tmp
 /.cyg*
 /confdefs.*
+/conftest
 /conftest.*
 
-# Libtool adds these, at least sometimes
+# files generated by autotools (`./autogen.sh`)
+## The initial / makes these files only get ignored in particular directories.
+/aclocal.m4
+/autom4te.cache
+/build-aux/
+/configure
+/config.h.in
 /m4/libtool.m4
 /m4/ltoptions.m4
 /m4/ltsugar.m4
 /m4/ltversion.m4
 /m4/lt~obsolete.m4
+/Makefile.in
 
-/aclocal.m4
-compile
-config.cache
-config.guess
+# files generated by configure (`mkdir build; cd build && ../configure`)
+*.log
+*.pc
+.deps/
+config.h
 config.log
 config.status
-config.sub
-configure
-configure.lineno
-depcomp
-config.h
-config.h.in
-install-sh
+evconfig-private.h
 libtool
-ltmain.sh
-missing
+Makefile
 stamp-h1
 stamp-h2
 
+# other generated config files (which command?)
+config.cache
+config.guess
+config.sub
+
 # files generated by doxygen
 doxygen
 CMakeDoxyfile.in
 CMakeDoxygenDefaults.cmake
 Doxyfile.doxygen
 
-# sample binaries
+# files generated by make (`mkdir build; cd build && ../configure && make`)
+.dirstamp
+.libs/
+*.la
+*.lo
+*.o
+event-config.h
+
+## make generated files under /sample
+becat
 dns-example
 event-read-fifo
+event-test
 hello-world
-http-server
 http-connect
-le-proxy
+http-server
 https-client
 https-client-mbedtls
-ssl-client-mbedtls
+le-proxy
 signal-test
+ssl-client-mbedtls
 time-test
-event-test
 watch-timing
-becat
 ws-chat-server
 
-# test binaries
-test-driver
+## make generated files under /test
 bench
 bench_cascade
 bench_http
 bench_httpclient
 regress
-regress.gen.c
-regress.gen.h
 rpcgen-attempted
+test-changelist
+test-closed
+test-driver
 test-dumpevents
 test-eof
-test-closed
+test-fdleak
 test-init
+test-kq-collision
 test-ratelim
 test-script.sh
 test-time
 test-weof
-test-changelist
-test-fdleak
-test-kq-collision
 
-event-config.h
-evconfig-private.h
+# files generated by event_rpcgen.py (`python3 event_rpcgen.py test/regress.rpc`)
+regress.gen.c
+regress.gen.h
 
-# Files generated by cmake
+# files generated by cmake (`cmake -B build && cmake --build build`)
+/build/
 CMakeCache.txt
 CMakeFiles/
 CTestTestfile.cmake
@@ -140,30 +138,39 @@ DartConfiguration.tcl
 LibeventConfig.cmake
 LibeventConfigVersion.cmake
 LibeventTargets*.cmake
+Uninstall.cmake
 bin/
 cmake_install.cmake
-Uninstall.cmake
 compile_commands.json
+event.dir
+event_core.dir
+event_extra.dir
+install_manifest.txt
 lib/
 tmp/
 verify_tests.sh
 verify_tests.bat
-event.dir
-event_core.dir
-event_extra.dir
 *.vcxproj
 *.sln
 *.filters
-install_manifest.txt
-test-export/build
 
-# ninja
+# files generated by Xcode (`cmake -B build -G Xcode && cmake --build build`)
+*.resp
+*.d
+*.dia
+Debug/
+Release/
+XCBuildData/
+CMakeScripts/
+libevent.xcodeproj/
+
+# files generated by Ninja (`cmake -B build -G Ninja && cmake --build build`)
 build.ninja
 rules.ninja
 .ninja_deps
 .ninja_log
 
-# make dist
+# make dist (`mkdir build; cd build && ../configure && make distcheck`)
 /COPYING
 /INSTALL
 *.tar.gz
@@ -178,5 +185,6 @@ rules.ninja
 # VS/VSCode
 .vs/
 .vscode/
+
 # IntelliJ/Clion
 .idea/