Use system __progname variable in progname module if available

diff --git a/configure.ac b/configure.ac
index c9cf0a46003ee30945e7d5b3b9b1661fe82a8e3c..ab7f96abb9c25d7c57e6f4deb71c21d3f1247b93 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -37,6 +37,15 @@ AC_TYPE_SIZE_T
 AC_TYPE_SSIZE_T
 
 # Checks for library functions.
+AC_MSG_CHECKING([for __progname])
+AC_LINK_IFELSE(
+       [AC_LANG_PROGRAM([[]],
+                        [[extern char *__progname;
+                          const char *p = __progname;]])],
+       [AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname])
+        AC_MSG_RESULT([yes])],
+       [AC_MSG_RESULT([no])])
+
 AC_CHECK_FUNCS([getexecname])
 
 AC_CONFIG_FILES([

diff --git a/src/progname.c b/src/progname.c
index b5132d8ec0c13db88f5efd9c03c48653ba226af9..4d0fee7e48853e91bfb973f8165a90afe601c1d0 100644 (file)
--- a/src/progname.c
+++ b/src/progname.c
@@ -33,7 +33,11 @@
 #include <string.h>
 #include <stdlib.h>
 
+#ifdef HAVE___PROGNAME
+extern const char *__progname;
+#else
 static const char *__progname = NULL;
+#endif
 
 const char *
 getprogname(void)