[libcamera-devel] [PATCH] meson: fix build when sys/auxv.h and getauxval() are not present

[Giulio Benetti]

On some libc sys/auxv.h could not be present and getauxval() too.
This way build will fail.

Check in meson if they are present and add HAVE_SYS_AUXV_H and
HAVE_GETAUXVAL defines to cxx arguments.
Add #ifdef HAVE_ statements around #include <sys/auxv.h> and getauxval()
in utils.cpp.

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
---
 meson.build             | 12 ++++++++++++
 src/libcamera/utils.cpp |  4 ++++
 2 files changed, 16 insertions(+)

diff --git a/meson.build b/meson.build
index 6e68c3e..72a3652 100644
--- a/meson.build
+++ b/meson.build
@@ -20,6 +20,18 @@ common_arguments = [
 c_arguments = common_arguments
 cpp_arguments = common_arguments
 
+cxx = meson.get_compiler('cpp')
+
+# check for header sys/auxv.h
+if cxx.has_header('sys/auxv.h')
+  cpp_arguments += ['-DHAVE_SYS_AUXV_H']
+endif
+
+# check for function getauxval()
+if cxx.has_function('getauxval')
+  cpp_arguments += ['-DHAVE_GETAUXVAL']
+endif
+
 add_project_arguments(c_arguments, language: 'c')
 add_project_arguments(cpp_arguments, language: 'cpp')
 
diff --git a/src/libcamera/utils.cpp b/src/libcamera/utils.cpp
index 66123b1..ae574ab 100644
--- a/src/libcamera/utils.cpp
+++ b/src/libcamera/utils.cpp
@@ -8,7 +8,9 @@
 #include "utils.h"
 
 #include <string.h>
+#ifdef HAVE_SYS_AUXV_H
 #include <sys/auxv.h>
+#endif
 
 /**
  * \file utils.h
@@ -57,8 +59,10 @@ const char *basename(const char *path)
  */
 char *secure_getenv(const char *name)
 {
+#ifdef HAVE_GETAUXVAL
 	if (getauxval(AT_SECURE))
 		return NULL;
+#endif
 
 	return getenv(name);
 }
-- 
2.17.1