+AC_CACHE_CHECK(
+ [for std::this_thread::sleep_for],
+ [folly_cv_func_this_thread_sleep_for],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <thread>
+ #include <chrono>
+ void func() { std::this_thread::sleep_for(std::chrono::seconds(1)); }]],
+ [folly_cv_func_this_thread_sleep_for=yes],
+ [folly_cv_func_this_thread_sleep_for=no])])
+
+if test "$folly_cv_func_this_thread_sleep_for" = yes; then
+ AC_DEFINE([HAVE_STD__THIS_THREAD__SLEEP_FOR], [1],
+ [Define to 1 if std::this_thread::sleep_for() is defined.])
+fi
+
+AC_CACHE_CHECK(
+ [for constexpr strlen],
+ [folly_cv_func_constexpr_strlen],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <cstring>
+ static constexpr int val = strlen("foo");]],
+ [folly_cv_func_constexpr_strlen=yes],
+ [folly_cv_func_constexpr_strlen=no])])
+
+if test "$folly_cv_func_constexpr_strlen" = yes; then
+ AC_DEFINE([HAVE_CONSTEXPR_STRLEN], [1],
+ [Define to 1 if strlen(3) is constexpr.])
+fi
+
+AC_CACHE_CHECK(
+ [for libc++],
+ [folly_cv_lib_libcpp],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <type_traits>
+ #if !_LIBCPP_VERSION
+ #error No libc++
+ #endif
+ void func() {}]
+ ],
+ [folly_cv_lib_libcpp=yes],
+ [folly_cv_lib_libcpp=no])])
+
+if test "$folly_cv_lib_libcpp" = yes; then
+ AC_DEFINE([USE_LIBCPP], [1], [Define to 1 if we are using libc++.])
+fi
+
+AC_CACHE_CHECK(
+ [for c++11 atomic support without GNU Atomic library],
+ [folly_cv_lib_libatomic],
+ [AC_LINK_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <atomic>
+ int main() {
+ struct Test { int val; };
+ std::atomic<Test> s;
+ s.is_lock_free();
+ }
+ ]],
+ [folly_cv_lib_libatomic=yes],
+ [folly_cv_lib_libatomic=no])])
+
+if test "$folly_cv_lib_libatomic" = no; then
+ AC_HAVE_LIBRARY([atomic],[],[AC_MSG_ERROR(
+ [Please install the GNU Atomic library])])
+fi
+
+AC_CACHE_CHECK(
+ [for usable std::is_trivially_copyable],
+ [folly_cv_decl_std_is_trivially_copyable],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <type_traits>
+ const bool val = std::is_trivially_copyable<bool>::value;]
+ ],
+ [folly_cv_decl_std_is_trivially_copyable=yes],
+ [folly_cv_decl_std_is_trivially_copyable=no])])
+
+if test "$folly_cv_decl_std_is_trivially_copyable" = yes; then
+ AC_DEFINE([HAVE_STD__IS_TRIVIALLY_COPYABLE], [1],
+ [Define to 1 if we have a usable std::is_trivially_copyable<T>
+ implementation.])
+fi
+
+AC_CACHE_CHECK(
+ [gflags namespace],
+ [folly_cv_decl_gflags_namespace],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <gflags/gflags.h>
+ void foo() { gflags::GetArgv(); }]
+ ],
+ [folly_cv_decl_gflags_namespace=gflags],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <gflags/gflags.h>
+ void foo() { google::GetArgv(); }]
+ ],
+ [folly_cv_decl_gflags_namespace=google],
+ [folly_cv_decl_gflags_namespace=error])])])
+
+if test "$folly_cv_decl_gflags_namespace" = error; then
+ AC_MSG_ERROR([Cannot determine gflags namespace])
+else
+ AC_DEFINE_UNQUOTED(
+ [GFLAGS_NAMESPACE], [$folly_cv_decl_gflags_namespace],
+ [Define to gflags namespace (usually "google" or "gflags")])
+ if test "$folly_cv_decl_gflags_namespace" != gflags; then
+ AC_DEFINE([UNUSUAL_GFLAGS_NAMESPACE], [1],
+ [Define to 1 if the gflags namespace is not "gflags"])
+ fi
+fi
+
+# Figure out if we support weak symbols. If not, we will link in some null
+# stubs for functions that would otherwise be weak.
+AC_CACHE_CHECK(
+ [for weak symbol support],
+ [folly_cv_prog_cc_weak_symbols],
+ [AC_LINK_IFELSE(
+ [AC_LANG_SOURCE[
+ extern "C" void configure_link_extern_weak_test() __attribute__((weak));
+ int main(int argc, char** argv) {
+ return configure_link_extern_weak_test == nullptr;
+ }]],
+ [folly_cv_prog_cc_weak_symbols="yes"],
+ [folly_cv_prog_cc_weak_symbols="no"])])
+
+if test "$folly_cv_prog_cc_weak_symbols" = yes; then
+ AC_DEFINE([HAVE_WEAK_SYMBOLS], [1],
+ [Define to 1 if the linker supports weak symbols.])
+fi
+
+# Figure out whether the architecture supports unaligned reads
+AC_CACHE_CHECK(
+ [for unaligned reads support],
+ [folly_cv_prog_cc_unaligned_reads],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE[
+ int main(int argc, char** argv) {
+ char buf[64] = {0};
+ unsigned long *ptr = (unsigned long *)(buf + 1);
+ *ptr = 0xdeadbeef;
+ return (*ptr & 0xff) == 0xef ? 0 : 1;
+ }
+ ]],
+ [folly_cv_prog_cc_unaligned_reads=yes],
+ [folly_cv_prog_cc_unaligned_reads=no])])
+
+if test "$folly_cv_prog_cc_unaligned_reads" = "yes"; then
+ AC_DEFINE([HAVE_UNALIGNED_READS], [1], [Define to 1 if the architecture allows unaligned reads])
+fi
+
+AC_CACHE_CHECK(
+ [for vsnprintf reporting bad format strings],
+ [folly_cv_prog_vsnprintf_bad_format],
+ [AC_RUN_IFELSE(
+ [AC_LANG_SOURCE[
+ #include <stdio.h>
+
+ int main(int argc, char** argv) {
+ char buf[256];
+ return vsnprintf(buf, sizeof(buf), "%", 1) < 0 ? 0 : 1;
+ }]],
+ [folly_cv_prog_vsnprintf_bad_format="yes"],
+ [folly_cv_prog_vsnprintf_bad_format="no"])])
+
+if test "$folly_cv_prog_vsnprintf_bad_format" = yes; then
+ AC_DEFINE([HAVE_VSNPRINTF_ERRORS], [1],
+ [Define to 1 if the vsnprintf supports returning errors on bad format strings.])
+fi
+
+AC_SEARCH_LIBS([cplus_demangle_v3_callback], [iberty_pic iberty])
+if test "$ac_cv_search_cplus_demangle_v3_callback" != "no" ; then
+ AC_DEFINE([HAVE_CPLUS_DEMANGLE_V3_CALLBACK], [1],
+ [Define to 1 if we have cplus_demangle_v3_callback.])
+fi