mirror of
https://github.com/bitcoin/bitcoin.git
synced 2024-11-19 18:09:47 +01:00
43 lines
1.2 KiB
Plaintext
43 lines
1.2 KiB
Plaintext
|
# On some platforms clang builtin implementations
|
||
|
|
# require compiler-rt as a runtime library to use.
|
||
|
|
#
|
||
|
|
# See:
|
||
|
|
# - https://bugs.llvm.org/show_bug.cgi?id=28629
|
||
|
|
|
||
|
|
m4_define([_CHECK_RUNTIME_testbody], [[
|
||
|
|
bool f(long long x, long long y, long long* p)
|
||
|
|
{
|
||
|
|
return __builtin_mul_overflow(x, y, p);
|
||
|
|
}
|
||
|
|
int main() { return 0; }
|
||
|
|
]])
|
||
|
|
|
||
|
|
AC_DEFUN([CHECK_RUNTIME_LIB], [
|
||
|
|
|
||
|
|
AC_LANG_PUSH([C++])
|
||
|
|
|
||
|
|
AC_MSG_CHECKING([for __builtin_mul_overflow])
|
||
|
|
AC_LINK_IFELSE(
|
||
|
|
[AC_LANG_SOURCE([_CHECK_RUNTIME_testbody])],
|
||
|
|
[
|
||
|
|
AC_MSG_RESULT([yes])
|
||
|
|
AC_DEFINE([HAVE_BUILTIN_MUL_OVERFLOW], [1], [Define if you have a working __builtin_mul_overflow])
|
||
|
|
],
|
||
|
|
[
|
||
|
|
ax_check_save_flags="$LDFLAGS"
|
||
|
|
LDFLAGS="$LDFLAGS --rtlib=compiler-rt -lgcc_s"
|
||
|
|
AC_LINK_IFELSE(
|
||
|
|
[AC_LANG_SOURCE([_CHECK_RUNTIME_testbody])],
|
||
|
|
[
|
||
|
|
AC_MSG_RESULT([yes, with additional linker flags])
|
||
|
|
RUNTIME_LDFLAGS="--rtlib=compiler-rt -lgcc_s"
|
||
|
|
AC_DEFINE([HAVE_BUILTIN_MUL_OVERFLOW], [1], [Define if you have a working __builtin_mul_overflow])
|
||
|
|
],
|
||
|
|
[AC_MSG_RESULT([no])])
|
||
|
|
LDFLAGS="$ax_check_save_flags"
|
||
|
|
])
|
||
|
|
|
||
|
|
AC_LANG_POP
|
||
|
|
AC_SUBST([RUNTIME_LDFLAGS])
|
||
|
|
])
|