From 21095adeffe6d053c29019f335ceb5c339a15e8b Mon Sep 17 00:00:00 2001
From: Nikias Bassen
Date: Fri, 12 Oct 2018 15:47:45 +0200
Subject: Properly detect availability of program_invocation_short_name and
 suppress compiler warning

---
 configure.ac     | 18 ++++++++++++++++++
 src/libusbmuxd.c |  4 ++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index b6bb9fa..b719b96 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,6 +82,24 @@ case ${host_os} in
     AC_MSG_RESULT([yes])
     AX_PTHREAD([], [AC_MSG_ERROR([pthread is required to build libusbmuxd])])
     AC_CHECK_LIB(pthread, [pthread_create, pthread_mutex_lock], [], [AC_MSG_ERROR([pthread is required to build libusbmuxd])])
+    AC_CACHE_CHECK(for program_invocation_short_name, ac_cv_program_invocation_short_name,[
+        AC_TRY_LINK([extern char* program_invocation_short_name;],[return program_invocation_short_name;],
+            [ac_cv_program_invocation_short_name=yes],
+            [ac_cv_program_invocation_short_name=no]
+        )
+    ])
+    if test "x$ac_cv_program_invocation_short_name" = "xyes"; then
+        AC_DEFINE(HAVE_PROGRAM_INVOCATION_SHORT_NAME, 1, [Define if you have program_invocation_short_name])
+        AC_CACHE_CHECK(if program_invocation_short_name is declared in errno.h, ac_cv_program_invocation_short_name_errno_h,[
+            AC_TRY_LINK([#include <errno.h>],[return program_invocation_short_name;],
+                [ac_cv_program_invocation_short_name_errno_h=yes],
+                [ac_cv_program_invocation_short_name_errno_h=no]
+            )
+        ])
+        if test "x$ac_cv_program_invocation_short_name_errno_h" = "xyes"; then
+            AC_DEFINE(HAVE_PROGRAM_INVOCATION_SHORT_NAME_ERRNO_H, 1, [Define if program_invocation_short_name is declared in errno.h])
+        fi
+    fi
     ;;
 esac
 AM_CONDITIONAL(WIN32, test x$win32 = xtrue)
diff --git a/src/libusbmuxd.c b/src/libusbmuxd.c
index 39db216..712c362 100644
--- a/src/libusbmuxd.c
+++ b/src/libusbmuxd.c
@@ -59,7 +59,7 @@
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <pthread.h>
-#ifdef _GNU_SOURCE
+#if defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME) && !defined(HAVE_PROGRAM_INVOCATION_SHORT_NAME_ERRNO_H)
 extern char *program_invocation_short_name;
 #endif
 #ifdef __APPLE__
@@ -521,7 +521,7 @@ static void get_prog_name()
 	#endif
 	}
 	free(_pname);
-#elif defined (_GNU_SOURCE)
+#elif defined (HAVE_PROGRAM_INVOCATION_SHORT_NAME)
 	char *pname = program_invocation_short_name;
 	if (pname) {
 		prog_name = strdup(pname);
-- 
cgit v1.1-32-gdbae