diff options
| -rw-r--r-- | configure.ac | 2 | ||||
| -rw-r--r-- | src/Makefile.leveldb.include | 2 | ||||
| -rw-r--r-- | src/random.cpp | 7 |
3 files changed, 8 insertions, 3 deletions
diff --git a/configure.ac b/configure.ac index b681f3f6de..821563440f 100644 --- a/configure.ac +++ b/configure.ac @@ -344,6 +344,7 @@ if test "x$enable_werror" = "xyes"; then AX_CHECK_COMPILE_FLAG([-Werror=unused-variable],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=unused-variable"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Werror=date-time],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=date-time"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Werror=return-type],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=return-type"],,[[$CXXFLAG_WERROR]]) + AX_CHECK_COMPILE_FLAG([-Werror=conditional-uninitialized],[ERROR_CXXFLAGS="$ERROR_CXXFLAGS -Werror=conditional-uninitialized"],,[[$CXXFLAG_WERROR]]) fi if test "x$CXXFLAGS_overridden" = "xno"; then @@ -358,6 +359,7 @@ if test "x$CXXFLAGS_overridden" = "xno"; then AX_CHECK_COMPILE_FLAG([-Wredundant-decls],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wredundant-decls"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wunused-variable],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wunused-variable"],,[[$CXXFLAG_WERROR]]) AX_CHECK_COMPILE_FLAG([-Wdate-time],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wdate-time"],,[[$CXXFLAG_WERROR]]) + AX_CHECK_COMPILE_FLAG([-Wconditional-uninitialized],[WARN_CXXFLAGS="$WARN_CXXFLAGS -Wconditional-uninitialized"],,[[$CXXFLAG_WERROR]]) dnl Some compilers (gcc) ignore unknown -Wno-* options, but warn about all dnl unknown options if any other warning is produced. Test the -Wfoo case, and diff --git a/src/Makefile.leveldb.include b/src/Makefile.leveldb.include index 04b53471e4..79ff72ca8d 100644 --- a/src/Makefile.leveldb.include +++ b/src/Makefile.leveldb.include @@ -36,7 +36,7 @@ LEVELDB_CPPFLAGS_INT += -DLEVELDB_PLATFORM_POSIX endif leveldb_libleveldb_a_CPPFLAGS = $(AM_CPPFLAGS) $(LEVELDB_CPPFLAGS_INT) $(LEVELDB_CPPFLAGS) -leveldb_libleveldb_a_CXXFLAGS = $(AM_CXXFLAGS) $(PIE_FLAGS) +leveldb_libleveldb_a_CXXFLAGS = $(filter-out -Wconditional-uninitialized -Werror=conditional-uninitialized, $(AM_CXXFLAGS)) $(PIE_FLAGS) leveldb_libleveldb_a_SOURCES= leveldb_libleveldb_a_SOURCES += leveldb/port/port_stdcxx.h diff --git a/src/random.cpp b/src/random.cpp index b408b1e13e..5b8782d1ce 100644 --- a/src/random.cpp +++ b/src/random.cpp @@ -116,7 +116,10 @@ static uint64_t GetRdRand() noexcept // RdRand may very rarely fail. Invoke it up to 10 times in a loop to reduce this risk. #ifdef __i386__ uint8_t ok; - uint32_t r1, r2; + // Initialize to 0 to silence a compiler warning that r1 or r2 may be used + // uninitialized. Even if rdrand fails (!ok) it will set the output to 0, + // but there is no way that the compiler could know that. + uint32_t r1 = 0, r2 = 0; for (int i = 0; i < 10; ++i) { __asm__ volatile (".byte 0x0f, 0xc7, 0xf0; setc %1" : "=a"(r1), "=q"(ok) :: "cc"); // rdrand %eax if (ok) break; @@ -128,7 +131,7 @@ static uint64_t GetRdRand() noexcept return (((uint64_t)r2) << 32) | r1; #elif defined(__x86_64__) || defined(__amd64__) uint8_t ok; - uint64_t r1; + uint64_t r1 = 0; // See above why we initialize to 0. for (int i = 0; i < 10; ++i) { __asm__ volatile (".byte 0x48, 0x0f, 0xc7, 0xf0; setc %1" : "=a"(r1), "=q"(ok) :: "cc"); // rdrand %rax if (ok) break; |