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Fix the __progname check to avoid the optimizer discarding the symbol

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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.
This commit is contained in:
Guillem Jover 2016-08-28 17:13:20 +02:00
parent 337e620275
commit 368af99f55
1 changed files with 2 additions and 3 deletions
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5
configure.ac
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@ -131,9 +131,8 @@ AC_LINK_IFELSE(
AC_MSG_CHECKING([for __progname]) AC_MSG_CHECKING([for __progname])
AC_LINK_IFELSE( AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[]], [AC_LANG_PROGRAM([[extern char *__progname;]],
[[extern char *__progname; [[printf("%s", __progname);]])],
const char *p = __progname;]])],
[AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname]) [AC_DEFINE([HAVE___PROGNAME], [1], [Define to 1 if you have __progname])
AC_MSG_RESULT([yes])], AC_MSG_RESULT([yes])],
[AC_MSG_RESULT([no])]) [AC_MSG_RESULT([no])])