Small improvement to compilation time

Compile the event list into its own object file and forward-declare

.github/workflows/build.yml

@@ -2,7 +2,7 @@ name: build
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, dev-dont-use ]
     tags: [ 'v*' ]
   pull_request:
     branches: [ master ]

CHANGES.md

@@ -15,6 +15,7 @@
 * Build system fixes:
   * macOS: ask Homebrew about liquid-dsp location instead of hardcoding it
   * Set default installation prefix to /usr/local (all platforms)
+  * Reduce compiler workload somewhat with forward declarations
 
 ## 1.0.1 (2024-07-19)
 

README.md

@@ -104,6 +104,8 @@ line instead of `meson compile` to limit the number of build processes:
 
         $ taskset -c 0 meson compile
 
+The compilation will still require at least 500 MB of free RAM.
+
 ## Usage
 
 Redsea reads an MPX signal from stdin by default. It expects the input
@@ -217,6 +219,7 @@ redsea -f WAVEFILE
 * Linux/macOS/Cygwin/MSYS2+MinGW
 * C++14 compiler
 * meson + ninja
+* 500 MB of free memory for non-parallel build ([breakdown](https://github.com/windytan/redsea/issues/120#issuecomment-2559254338))
 
 ### Testing
 

meson.build

@@ -103,6 +103,7 @@ sources_no_main = [
   'src/rdsstring.cc',
   'src/tables.cc',
   'src/tmc/csv.cc',
+  'src/tmc/events_data.cc',
   'src/tmc/tmc.cc',
   'src/tmc/locationdb.cc',
   'src/util.cc',

src/tmc/events.h

@@ -0,0 +1,16 @@
+#ifndef TMC_EVENTS_H_
+#define TMC_EVENTS_H_
+
+#include <array>
+#include <string>
+
+namespace redsea {
+namespace tmc {
+
+extern const std::array<std::string, 1553> tmc_data_events;
+extern const std::array<std::string, 233> tmc_data_suppl;
+
+}  // namespace tmc
+}  // namespace redsea
+
+#endif  // TMC_EVENTS_H_

src/tmc/event_list.h → src/tmc/events_data.cc

@@ -1,5 +1,4 @@
-#ifndef TMC_EVENT_LIST_H_
-#define TMC_EVENT_LIST_H_
+#include "events.h"
 
 #include <array>
 #include <string>
@@ -1801,4 +1800,3 @@ const std::array<std::string, 233> tmc_data_suppl{
 
 }  // namespace tmc
 }  // namespace redsea
-#endif  // TMC_EVENT_LIST_H_

src/tmc/tmc.cc

@@ -33,7 +33,7 @@
 #include "src/common.h"
 #include "src/tables.h"
 #include "src/tmc/csv.h"
-#include "src/tmc/event_list.h"
+#include "src/tmc/events.h"
 #include "src/tmc/locationdb.h"
 
 namespace redsea {