diff options
| -rw-r--r-- | configure.ac | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index 053e5d7..2413673 100644 --- a/configure.ac +++ b/configure.ac @@ -43,6 +43,17 @@ AC_CACHE_CHECK([whether $1 is compilable], [$4=no])]) ]) +dnl JE_RUNNABLE(label, hcode, mcode, rvar) +AC_DEFUN([JE_RUNNABLE], +[ +AC_CACHE_CHECK([whether $1 is runnable], + [$4], + [AC_RUN_IFELSE([AC_LANG_PROGRAM([$2], + [$3])], + [$4=yes], + [$4=no])]) +]) + dnl ============================================================================ CONFIG=`echo ${ac_configure_args} | sed -e 's#'"'"'\([^ ]*\)'"'"'#\1#g'` @@ -1649,7 +1660,11 @@ fi dnl ============================================================================ dnl Check for os_unfair_lock operations as provided on Darwin. -JE_COMPILABLE([Darwin os_unfair_lock_*()], [ +dnl Run the test program rather than merely compiling so that dyld lazy symbol +dnl binding doesn't result in a false positive if building with a version of +dnl XCode (>7) that supports the API on a system that is too old to actually +dnl implement it (<10.12). +JE_RUNNABLE([Darwin os_unfair_lock_*()], [ #include <os/lock.h> ], [ os_unfair_lock lock = OS_UNFAIR_LOCK_INIT; |