From 50679dba044f37ed4aeae5c6b58550baefe968dd Mon Sep 17 00:00:00 2001
From: Philip Withnall <withnall@endlessm.com>
Date: Mon, 6 Jul 2020 11:25:32 +0100
Subject: [PATCH] build: Add feature test flags to project-wide preprocessor
 flags
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Rather than defining them piecemeal in each C and H file, and having
problems with headers being included in different orders so that
`_POSIX_C_SOURCE` gets a value which is too low, just define the feature
test flags in `meson.build`.

See `man 7 feature_test_macros`.

This is useful for when building sysprof as a subproject beneath a
project which doesn’t define these macros, or which targets an older C
standard than `gnu11`.

Signed-off-by: Philip Withnall <withnall@endlessm.com>
---
 meson.build | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index e1e9b42d..26f289f0 100644
--- a/meson.build
+++ b/meson.build
@@ -87,7 +87,10 @@ add_project_arguments([
   '-I' + meson.build_root(), # config.h
 ], language: 'c')
 
-global_c_args = []
+global_c_args = [
+  '-D_GNU_SOURCE',
+  '-D_POSIX_C_SOURCE=200809L',
+]
 test_c_args = [
   '-Wcast-align',
   '-Wdeclaration-after-statement',