meson.build: Fix detection of symbols

This patch changes the behavior of meson to define configuration options
*only* when the symbol checked is present. Currently, it defines all of
them in config.h whether the symbol exists or not and the code that
looks for it doesn't check the macro's value, but whether it's defined.

Signed-off-by: Mark Weiman <mark.weiman@markzz.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/meson.build b/meson.build
index 579ff2ed..f76a647b 100644
--- a/meson.build
+++ b/meson.build
@@ -146,7 +146,9 @@ foreach sym : [
     'tcflush',
   ]
   have = cc.has_function(sym, args : '-D_GNU_SOURCE')
-  conf.set10('HAVE_' + sym.to_upper(), have)
+  if have
+    conf.set10('HAVE_' + sym.to_upper(), have)
+  endif
 endforeach
 
 foreach member : [