build - find environe and build when found

meson didnt look for environ thus it was never found and defined. this
is a fallback for having no clearenv() so essentially no os work
talking about is in this situation anymore.

1 files changed, 11 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index f081e5b1a2..fb3749bb3b 100644
--- a/meson.build
+++ b/meson.build
@@ -198,6 +198,17 @@ endif
 
 dep_fnmatch = cc.find_library('fnmatch', required: false)
 
+code = '''#define _GNU_SOURCE 1
+#include <unistd.h>
+#include <stdio.h>
+extern char **environ;
+void func(void) { printf("%p\n", environ); }
+'''
+if cc.compiles(code, args : '-lc', name : 'environ check')
+  config_h.set10('HAVE_ENVIRON', true)
+endif
+
+
 add_global_arguments('-DPACKAGE_BIN_DIR="@0@"'.format(dir_bin), language: 'c')
 add_global_arguments('-DPACKAGE_LIB_DIR="@0@"'.format(dir_lib), language: 'c')
 add_global_arguments('-DPACKAGE_DATA_DIR="@0@"'.format(join_paths(dir_data, proj)), language: 'c')