gout

commit 0c4663793cbeaf895e903e17fa10f5525cace9ae
parent b89c1315f79c1617cb8966de023a11167d3371c8
Author: Chris Bracken <chris@bracken.jp>
Date:   Thu, 26 Feb 2026 08:54:08 +0900

build: extract posix_env config

Moves definitions like _POSIX_C_SOURCE and _XOPEN_SOURCE to a posix_env
config, and enables macOS/Linux-specific extensions only for those
platforms.

We can also remove _BSD_SOURCE since as of POSIX 2008, _DEFAULT_SOURCE
replaces it and gives us everything we need.

Diffstat:
M
BUILD.gn
 | 
8
+-------
M
build/BUILD.gn
 | 
13
+++++++++++++

2 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/BUILD.gn b/BUILD.gn
@@ -4,13 +4,6 @@ config("gout_config") {
                    "//src",
                  ] + system_include_dirs
   lib_dirs = [] + system_lib_dirs
-  defines = [
-    "_POSIX_C_SOURCE=200809L",
-    "_XOPEN_SOURCE=700",
-    "_DEFAULT_SOURCE",
-    "_BSD_SOURCE",
-    "_DARWIN_C_SOURCE",
-  ]
   libs = [ "git2" ]
   configs = [
     "//build:compiler_std",
@@ -18,6 +11,7 @@ config("gout_config") {
     "//build:strict_prototypes",
     "//build:no_exceptions",
     "//build:no_rtti",
+    "//build:posix_env",
   ]
   if (is_debug) {
     configs += [
diff --git a/build/BUILD.gn b/build/BUILD.gn
@@ -5,6 +5,19 @@ config("compiler_std") {
   cflags_objcc = [ "-std=c++17" ]
 }
 
+config("posix_env") {
+  defines = [
+    "_POSIX_C_SOURCE=200809L",
+    "_XOPEN_SOURCE=700",
+  ]
+
+  if (target_os == "linux") {
+    defines += [ "_DEFAULT_SOURCE" ]
+  } else if (target_os == "mac") {
+    defines += [ "_DARWIN_C_SOURCE" ]
+  }
+}
+
 # Default compiler warnings.
 config("compiler_warnings") {
   cflags = [