diff options
| author | Costa Tsaousis (ktsaou) <costa@tsaousis.gr> | 2016-09-28 01:47:12 +0300 |
|---|---|---|
| committer | Costa Tsaousis (ktsaou) <costa@tsaousis.gr> | 2016-09-28 01:47:12 +0300 |
| commit | db3f85d062ae688dfed5d52970d2740e446a5220 (patch) | |
| tree | 638fddff442b29dbfa284ac6a2b2726a16691b70 /m4 | |
| parent | d24f24e145cf8f26132a3c937fe90cdbd383ad29 (diff) | |
autoconf for detecting 32/64 bit CPU
Diffstat (limited to 'm4')
| -rw-r--r-- | m4/ac_c___atomic.m4 | 30 | ||||
| -rw-r--r-- | m4/ac_c__generic.m4 | 28 |
2 files changed, 58 insertions, 0 deletions
diff --git a/m4/ac_c___atomic.m4 b/m4/ac_c___atomic.m4 new file mode 100644 index 0000000000..046a5514b8 --- /dev/null +++ b/m4/ac_c___atomic.m4 @@ -0,0 +1,30 @@ +# AC_C___ATOMIC +# ------------- +# Define HAVE_C___ATOMIC if __atomic works. +AN_IDENTIFIER([__atomic], [AC_C___ATOMIC]) +AC_DEFUN([AC_C___ATOMIC], +[AC_CACHE_CHECK([for __atomic], ac_cv_c___atomic, +[AC_COMPILE_IFELSE( + [AC_LANG_SOURCE( + [[int + main (int argc, char **argv) + { + volatile unsigned long ul1 = 1, ul2 = 0, ul3 = 2; + __atomic_compare_exchange(&ul1, &ul2, &ul3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&ul1, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_sub(&ul3, 1, __ATOMIC_SEQ_CST); + volatile unsigned long long ull1 = 1, ull2 = 0, ull3 = 2; + __atomic_compare_exchange(&ull1, &ull2, &ull3, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); + __atomic_fetch_add(&ull1, 1, __ATOMIC_SEQ_CST); + __atomic_fetch_sub(&ull3, 1, __ATOMIC_SEQ_CST); + return 0; + } + ]])], + [ac_cv_c___atomic=yes], + [ac_cv_c___atomic=no])]) +if test $ac_cv_c___atomic = yes; then + AC_DEFINE([HAVE_C___ATOMIC], 1, + [Define to 1 if __atomic operations work.]) +fi +])# AC_C___ATOMIC + diff --git a/m4/ac_c__generic.m4 b/m4/ac_c__generic.m4 new file mode 100644 index 0000000000..0c4dd52c6a --- /dev/null +++ b/m4/ac_c__generic.m4 @@ -0,0 +1,28 @@ +# https://lists.gnu.org/archive/html/autoconf-commit/2012-12/msg00004.html +# AC_C__GENERIC +# ------------- +# Define HAVE_C__GENERIC if _Generic works, a la C11. +AN_IDENTIFIER([_Generic], [AC_C__GENERIC]) +AC_DEFUN([AC_C__GENERIC], +[AC_CACHE_CHECK([for _Generic], ac_cv_c__Generic, +[AC_COMPILE_IFELSE( + [AC_LANG_SOURCE( + [[int + main (int argc, char **argv) + { + int a = _Generic (argc, int: argc = 1); + int *b = &_Generic (argc, default: argc); + char ***c = _Generic (argv, int: argc, default: argv ? &argv : 0); + _Generic (1 ? 0 : b, int: a, default: b) = &argc; + _Generic (a = 1, default: a) = 3; + return a + !b + !c; + } + ]])], + [ac_cv_c__Generic=yes], + [ac_cv_c__Generic=no])]) +if test $ac_cv_c__Generic = yes; then + AC_DEFINE([HAVE_C__GENERIC], 1, + [Define to 1 if C11-style _Generic works.]) +fi +])# AC_C__GENERIC + |