Commit 368af99f554ca1c7211faf9eedfffcf45e5e76bb
2016-08-28T17:13:20
Fix the __progname check to avoid the optimizer discarding the symbol Because we were assigning to another unused variable, when building the check with optimizations enabled, which is the default when using gcc as the compiler, the variable was being discarded. Instead pass it to printf() so that it cannot do so.
diff --git a/configure.ac b/configure.ac
index 5a432d4..5cbc2fa 100644
--- a/configure.ac
+++ b/configure.ac
@@ -131,9 +131,8 @@ AC_LINK_IFELSE(
AC_MSG_CHECKING([for __progname])
AC_LINK_IFELSE(
- [AC_LANG_PROGRAM([[]],
- [[extern char *__progname;
- const char *p = __progname;]])],
+ [AC_LANG_PROGRAM([[extern char *__progname;]],
+ [[printf("%s", __progname);]])],
[AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname])
AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])])