From ab32b4b4d08ffdcf1f364981898ed57d85e26aad Mon Sep 17 00:00:00 2001
From: Ihor Dutchak <>
Date: Mon, 25 Dec 2023 19:45:18 +0200
Subject: [PATCH] Define _GNU_SOURCE in config.h

Same way as libusb/autotools does it.
---
 CMakeLists.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index db4ccee..7b2e459 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,6 +71,9 @@ function(generate_config_file)
     endif()
 
     file(MAKE_DIRECTORY "${LIBUSB_GEN_INCLUDES}")
+    if(NOT MSVC)
+        set(_GNU_SOURCE TRUE)
+    endif()
     configure_file(config.h.in "${LIBUSB_GEN_INCLUDES}/config.h" @ONLY)
 endfunction()