Makefile: allow "bin-wrappers/" directory to exist

The "bin-wrappers/" directory gets created by our build system and is
populated with one script for each of our binaries. There isn't anything
inherently wrong with the current layout, but it is somewhat hard to
adapt for out-of-tree build systems.

Adapt the layout such that our "bin-wrappers/" directory always exists
and contains our "wrap-for-bin.sh" script to make things a little bit
easier for subsequent steps.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

.gitignore

@@ -12,7 +12,6 @@
 /GIT-TEST-SUITES
 /GIT-USER-AGENT
 /GIT-VERSION-FILE
-/bin-wrappers/
 /git
 /git-add
 /git-am

Documentation/CodingGuidelines

@@ -583,7 +583,7 @@ For C programs:
    Run `GIT_DEBUGGER=1 ./bin-wrappers/git foo` to simply use gdb as is, or
    run `GIT_DEBUGGER="<debugger> <debugger-args>" ./bin-wrappers/git foo` to
    use your own debugger and arguments. Example: `GIT_DEBUGGER="ddd --gdb"
-   ./bin-wrappers/git log` (See `wrap-for-bin.sh`.)
+   ./bin-wrappers/git log` (See `bin-wrappers/wrap-for-bin.sh`.)
 
  - The primary data structure that a subsystem 'S' deals with is called
    `struct S`. Functions that operate on `struct S` are named

Makefile

@@ -3202,8 +3202,7 @@ test_bindir_programs := $(patsubst %,bin-wrappers/%,$(BINDIR_PROGRAMS_NEED_X) $(
 
 all:: $(TEST_PROGRAMS) $(test_bindir_programs) $(UNIT_TEST_PROGS) $(CLAR_TEST_PROG)
 
-bin-wrappers/%: wrap-for-bin.sh
-	$(call mkdir_p_parent_template)
+$(test_bindir_programs): bin-wrappers/%: bin-wrappers/wrap-for-bin.sh
 	$(QUIET_GEN)sed -e '1s|#!.*/sh|#!$(SHELL_PATH_SQ)|' \
 	     -e 's|@BUILD_DIR@|$(shell pwd)|' \
 	     -e 's|@PROG@|$(patsubst test-%,t/helper/test-%,$(@F))$(if $(filter-out $(BINDIR_PROGRAMS_NO_X),$(@F)),$(X),)|' < $< > $@ && \
@@ -3700,7 +3699,8 @@ clean: profile-clean coverage-clean cocciclean
 	$(RM) $(SP_OBJ)
 	$(RM) $(HCC)
 	$(RM) version-def.h
-	$(RM) -r bin-wrappers $(dep_dirs) $(compdb_dir) compile_commands.json
+	$(RM) -r $(dep_dirs) $(compdb_dir) compile_commands.json
+	$(RM) $(test_bindir_programs)
 	$(RM) -r po/build/
 	$(RM) *.pyc *.pyo */*.pyc */*.pyo $(GENERATED_H) $(ETAGS_TARGET) tags cscope*
 	$(RM) -r .dist-tmp-dir .doc-tmp-dir

bin-wrappers/.gitignore

@@ -0,0 +1,9 @@
+/git
+/git-cvsserver
+/git-receive-pack
+/git-shell
+/git-upload-archive
+/git-upload-pack
+/scalar
+/test-fake-ssh
+/test-tool

contrib/buildsystems/CMakeLists.txt

@@ -1095,20 +1095,20 @@ set(wrapper_test_scripts
 
 
 foreach(script ${wrapper_scripts})
-	file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
+	file(STRINGS ${CMAKE_SOURCE_DIR}/bin-wrappers/wrap-for-bin.sh content NEWLINE_CONSUME)
 	string(REPLACE "@BUILD_DIR@" "${CMAKE_BINARY_DIR}" content "${content}")
 	string(REPLACE "@PROG@" "${script}${EXE_EXTENSION}" content "${content}")
 	file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/${script} ${content})
 endforeach()
 
 foreach(script ${wrapper_test_scripts})
-	file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
+	file(STRINGS ${CMAKE_SOURCE_DIR}/bin-wrappers/wrap-for-bin.sh content NEWLINE_CONSUME)
 	string(REPLACE "@BUILD_DIR@" "${CMAKE_BINARY_DIR}" content "${content}")
 	string(REPLACE "@PROG@" "t/helper/${script}${EXE_EXTENSION}" content "${content}")
 	file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/${script} ${content})
 endforeach()
 
-file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
+file(STRINGS ${CMAKE_SOURCE_DIR}/bin-wrappers/wrap-for-bin.sh content NEWLINE_CONSUME)
 string(REPLACE "@BUILD_DIR@" "${CMAKE_BINARY_DIR}" content "${content}")
 string(REPLACE "@PROG@" "git-cvsserver" content "${content}")
 file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/git-cvsserver ${content})