From 13a02a622c11df783ccf155d62f61dc0c6d6a5b2 Mon Sep 17 00:00:00 2001
From: Egor Tensin <Egor.Tensin@gmail.com>
Date: Sat, 13 May 2023 13:40:33 +0200
Subject: cmake: document _GNU_SOURCE usage

---
 src/CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/CMakeLists.txt')

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9758c2e..9174061 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -4,6 +4,9 @@ else()
     add_compile_options(-std=c17 -Wpedantic -Wall -Wextra -Werror)
 endif()
 
+# Even w/ _POSIX_C_SOURCE=200809L, we still need accept4, pipe2, execvpe, etc.,
+# which are all _GNU_SOURCE-only (at least for glibc). Try compiling without
+# any features macros defined at all, and prepare to be amazed!
 add_compile_definitions(_GNU_SOURCE)
 
 add_compile_definitions(VERSION="${PROJECT_VERSION}")
-- 
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