From: Joel Rosdahl <joel@rosdahl.net>
Date: Tue, 4 Aug 2020 14:51:25 +0000 (+0200)
Subject: Work around missing std::is_trivially_copyable in GCC < 5
X-Git-Tag: v4.0~221
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=0789bc267731cf81ca2a28d08323c1d2c5851eee;p=thirdparty%2Fccache.git

Work around missing std::is_trivially_copyable in GCC < 5
---

diff --git a/src/InodeCache.cpp b/src/InodeCache.cpp
index d573afd04..eeef9ac88 100644
--- a/src/InodeCache.cpp
+++ b/src/InodeCache.cpp
@@ -63,7 +63,7 @@ const uint32_t k_num_entries = 4;
 
 static_assert(Digest::size() == 20,
               "Increment version number if size of digest is changed.");
-static_assert(std::is_trivially_copyable<Digest>::value,
+static_assert(IS_TRIVIALLY_COPYABLE(Digest),
               "Digest is expected to be trivially copyable.");
 
 static_assert(
diff --git a/src/system.hpp b/src/system.hpp
index 788123a79..845f21fd6 100644
--- a/src/system.hpp
+++ b/src/system.hpp
@@ -95,3 +95,10 @@ const size_t READ_BUFFER_SIZE = 65536;
 #ifdef HAVE_SYS_MMAN_H
 #  define INODE_CACHE_SUPPORTED
 #endif
+
+// Workaround for missing std::is_trivially_copyable in GCC < 5.
+#if __GNUG__ && __GNUC__ < 5
+#  define IS_TRIVIALLY_COPYABLE(T) __has_trivial_copy(T)
+#else
+#  define IS_TRIVIALLY_COPYABLE(T) std::is_trivially_copyable<T>::value
+#endif