diff options
Diffstat (limited to 'm4/japhar_grep_cflags.m4')
| -rw-r--r-- | m4/japhar_grep_cflags.m4 | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/m4/japhar_grep_cflags.m4 b/m4/japhar_grep_cflags.m4 new file mode 100644 index 0000000..cf2ea4a --- /dev/null +++ b/m4/japhar_grep_cflags.m4 @@ -0,0 +1,47 @@ +dnl +dnl JAPHAR_GREP_CFLAGS(flag, cmd_if_missing, cmd_if_present) +dnl +dnl From Japhar. Report changes to japhar@hungry.com +dnl +AC_DEFUN([JAPHAR_GREP_CFLAGS], +[case "$CFLAGS" in +"$1" | "$1 "* | *" $1" | *" $1 "* ) + ifelse($#, 3, [$3], [:]) + ;; +*) + $2 + ;; +esac +]) + +dnl +dnl Test for __attribute__ ((unused)) +dnl Based on code from the tcpdump version 3.7.2 source. +dnl + +AC_DEFUN([AC_C___ATTRIBUTE__], [ +AC_MSG_CHECKING(for __attribute__) +AC_CACHE_VAL(ac_cv___attribute__, [ +AC_TRY_COMPILE([ +#include <stdlib.h> +static void foo (void) __attribute__ ((unused)); + +static void +foo (void) +{ + exit(1); +} +], +[ + exit (0); +], +ac_cv___attribute__=yes, +ac_cv___attribute__=no)]) +if test "$ac_cv___attribute__" = "yes"; then + AC_DEFINE(UNUSED, __attribute__ ((unused)), [define if your compiler has __att +ribute__ ((unused))]) +else + AC_DEFINE(UNUSED,,) +fi +AC_MSG_RESULT($ac_cv___attribute__) +]) |