[libcamera-devel] [PATCH v2 1/2] meson: check if secure_getenv() is present

[Giulio Benetti]

Not all libc make secure_getenv() available, this could lead to build
failure on certain build systems.

Check if secure_getenv() and emit #define HAVE_SECURE_GETENV to config.h
Include config.h to every c/c++ file during building by adding `-include
config.h` to project arguments for both c and c++.

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
---
Changes:
V1->V2: use common_arguments to -include config.h and move secure_getenv()
        check before common_arguments list.

 meson.build | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/meson.build b/meson.build
index 6e68c3e..9099909 100644
--- a/meson.build
+++ b/meson.build
@@ -13,8 +13,19 @@ project('libcamera', 'c', 'cpp',
 #       generated from this too.
 api_version = '0.1'
 
+cc = meson.get_compiler('c')
+config_h = configuration_data()
+
+if cc.has_header_symbol('stdlib.h', 'secure_getenv', prefix: '#define _GNU_SOURCE')
+    config_h.set('HAVE_SECURE_GETENV', 1)
+else
+    message('C library does not support secure_getenv, using getenv instead')
+endif
+configure_file(output: 'config.h', configuration: config_h)
+
 common_arguments = [
     '-Wno-unused-parameter',
+    '-include', 'config.h',
 ]
 
 c_arguments = common_arguments
-- 
2.17.1