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utils: Enable __atomic* built-ins based on the GCC version

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This solves a problem with GNAT when compiling charon-tkm as __atomic*
built-ins are only provided in GCC 4.7 and newer.

Currently GNAT 4.6 and GCC 4.7.2 is shipped with Debian wheezy (stable),
as used in the testing environment.  So while the configure script correctly
detected the __atomic* built-ins, and defined HAVE_GCC_ATOMIC_OPERATIONS,
this define turned out to be incorrect when charon-tkm was later built
with GNAT.
This commit is contained in:
Tobias Brunner
2014-05-04 19:16:46 +02:00
committed by Andreas Steffen
parent 9be1c8d175
commit a0c2370ea5
2 changed files with 7 additions and 19 deletions
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configure.ac
-19
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@@ -668,25 +668,6 @@ AC_COMPILE_IFELSE(
[AC_MSG_RESULT([no])]
)
AC_MSG_CHECKING([for GCC __atomic operations])
AC_RUN_IFELSE([AC_LANG_SOURCE(
[[
int main() {
int ref = 1, val;
__atomic_fetch_add(&ref, 1, __ATOMIC_RELAXED);
val = __atomic_sub_fetch(&ref, 1, __ATOMIC_RELAXED);
__atomic_compare_exchange_n(&ref, &val, 0, 0, __ATOMIC_RELAXED,
__ATOMIC_RELAXED);
return ref;
}
]])],
[AC_MSG_RESULT([yes]);
AC_DEFINE([HAVE_GCC_ATOMIC_OPERATIONS], [],
[have GCC __atomic_* operations])],
[AC_MSG_RESULT([no])],
[AC_MSG_RESULT([no])]
)
AC_MSG_CHECKING([for GCC __sync operations])
AC_RUN_IFELSE([AC_LANG_SOURCE(
[[