cmake: add {-g3,-gsplit-dwarf} flags for debugging

cmake:
* check if we're being run for valgrind, in which case do not split
  dwarf information, valgrinds does not like it (see #1).

makefile:
* build for vagrant into a separate folder entirely.

ci:
* install gcc, cmake and ninja along with vagrant, since now we are
  building inside of the ci container as well.

close #1

.drone.starlark

@@ -58,7 +58,7 @@ def main(ctx):
 				"depends_on": ["build debug"],
 				"commands": [
 					"uname -r",
-					"pacman -Sy valgrind --noconfirm --needed",
+					"pacman -Sy gcc cmake ninja valgrind --noconfirm --needed",
 					"valgrind --version",
 					"make valgrind"
 				]
@@ -70,7 +70,7 @@ def main(ctx):
 				"depends_on": ["build release"],
 				"commands": [
 					"uname -r",
-					"pacman -Sy valgrind --noconfirm --needed",
+					"pacman -Sy gcc cmake ninja valgrind --noconfirm --needed",
 					"valgrind --version",
 					"make valgrind-release"
 				]

CMakeLists.txt

@@ -4,6 +4,26 @@ project(fortuna LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 
   if(CMAKE_BUILD_TYPE MATCHES "Debug")
+    # Produce debugging information in the operating system's native format.
+    # Level 3 includes extra information, such as all the macro definitions
+    # present in the program. Some debuggers support macro expansion when you
+    # use -g3
+    if(NOT CMAKE_CXX_FLAGS MATCHES "-g")
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g3")
+    endif(NOT CMAKE_CXX_FLAGS MATCHES "-g")
+
+    if(NOT $ENV{VALGRIND} MATCHES "true")
+      # If DWARF debugging information is enabled, separate as much debugging
+      # information as possible into a separate output file with the extension
+      # .dwo. This option allows the build system to avoid linking files with
+      # debug information.
+      if(NOT CMAKE_CXX_FLAGS MATCHES "-gsplit-dwarf")
+        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -gsplit-dwarf")
+      endif(NOT CMAKE_CXX_FLAGS MATCHES "-gsplit-dwarf")
+    else()
+      message(STATUS "VALGRIND=true, not setting '-gsplit-dwarf'")
+    endif(NOT $ENV{VALGRIND} MATCHES "true")
+
     if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")
       set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall")
     endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wall")

Makefile

@@ -10,17 +10,20 @@ r_folder = cmake-build-release
 t = clang-tidy
 t_args = --config="" --format-style=google --checks="clang-diagnostic-*,clang-analyzer-*,google-*" --use-color=true -p $(d_folder) ./*.{cpp,h}
 v = valgrind
+v_env = VALGRIND=
+v_db = $(d_folder)_valgr
+v_rl = $(r_folder)_valgr
 
 .PHONY: check tidy build debug release valgrind test
 
 debug:
 	if [ ! -d "$(d_folder)" ]; then mkdir -pv $(d_folder); fi
-	$(c) $(c_args)Debug -B $(d_folder) $(cpp_flags) && \
+	$(v_env)false $(c) $(c_args)Debug -B $(d_folder) $(cpp_flags) && \
 	$(n) $(n_args) $(d_folder)
 
 release:
 	if [ ! -d "$(r_folder)" ]; then mkdir -pv $(r_folder); fi
-	$(c) $(c_args)Release -B $(r_folder) $(cpp_flags) && \
+	$(v_env)false $(c) $(c_args)Release -B $(r_folder) $(cpp_flags) && \
 	$(n) $(n_args) $(r_folder)
 
 check:
@@ -33,10 +36,16 @@ tidy:
 valgrind: valgrind-debug
 
 valgrind-debug:
-	$(v) ./$(d_folder)/fortuna
+	if [ ! -d "$(v_db)" ]; then mkdir -pv "$(v_db)"; fi
+	$(v_env)true $(c) $(c_args)Debug -B "$(v_db)" $(cpp_flags) && \
+	$(n) $(n_args) "$(v_db)"
+	$(v) ./$(v_db)/fortuna
 
 valgrind-release:
-	$(v) ./$(r_folder)/fortuna
+	if [ ! -d "$(v_rl)" ]; then mkdir -pv "$(v_rl)"; fi
+	$(v_env)true $(c) $(c_args)Release -B "$(v_rl)" $(cpp_flags) && \
+	$(n) $(n_args) "$(v_rl)"
+	$(v) ./$(v_rl)/fortuna
 
 build: debug