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author | Anthony Towns <aj@erisian.com.au> | 2016-08-23 16:55:15 +1000 |
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committer | Anthony Towns <aj@erisian.com.au> | 2016-08-23 16:55:15 +1000 |
commit | 878faacd7b3daac437cc689b13422f6432fb5cd0 (patch) | |
tree | a762a13cd0aae098858c92884ec5821e48b1b246 | |
parent | 41d8e78f94c5ad54684f1f15efb0264036418e71 (diff) | |
download | bitcoin-878faacd7b3daac437cc689b13422f6432fb5cd0.tar.xz |
Add configure check for -latomic
-rw-r--r-- | build-aux/m4/l_atomic.m4 | 40 | ||||
-rw-r--r-- | configure.ac | 3 |
2 files changed, 43 insertions, 0 deletions
diff --git a/build-aux/m4/l_atomic.m4 b/build-aux/m4/l_atomic.m4 new file mode 100644 index 0000000000..906724b640 --- /dev/null +++ b/build-aux/m4/l_atomic.m4 @@ -0,0 +1,40 @@ +# Some versions of gcc/libstdc++ require linking with -latomic if +# using the C++ atomic library. +# +# Sourced from http://bugs.debian.org/797228 + +m4_define([_CHECK_ATOMIC_testbody], [[ + #include <atomic> + #include <cstdint> + + int main() { + std::atomic<int64_t> a{}; + + int64_t v = 5; + int64_t r = a.fetch_add(v); + return static_cast<int>(r); + } +]]) + +AC_DEFUN([CHECK_ATOMIC], [ + + AC_LANG_PUSH(C++) + + AC_MSG_CHECKING([whether std::atomic can be used without link library]) + + AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[ + AC_MSG_RESULT([yes]) + ],[ + AC_MSG_RESULT([no]) + LIBS="$LIBS -latomic" + AC_MSG_CHECKING([whether std::atomic needs -latomic]) + AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_ATOMIC_testbody])],[ + AC_MSG_RESULT([yes]) + ],[ + AC_MSG_RESULT([no]) + AC_MSG_FAILURE([cannot figure our how to use std::atomic]) + ]) + ]) + + AC_LANG_POP +]) diff --git a/configure.ac b/configure.ac index d332f4face..335609f5e5 100644 --- a/configure.ac +++ b/configure.ac @@ -57,6 +57,9 @@ case $host in esac dnl Require C++11 compiler (no GNU extensions) AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory]) +dnl Check if -latomic is required for <std::atomic> +CHECK_ATOMIC + dnl Libtool init checks. LT_INIT([pic-only]) |