build: Fix undefined reference to __mulodi4 #21882

hebasto · 2021-05-07T21:19:59Z

When compiling with clang on 32-bit systems the __mulodi4 symbol is defined in compiler-rt only.

Fixes #21294.

See more:

hebasto · 2021-05-07T21:20:37Z

@rebroad @MarcoFalke

Does this fix work in your cases?

maflcko · 2021-05-08T09:22:41Z

Concept and tested-only ACK 207b4e2 didn't review

maflcko · 2021-05-08T09:24:06Z

This allows to remove the workaround in oss-fuzz:

oss-fuzz# git diff
diff --git a/projects/bitcoin-core/build.sh b/projects/bitcoin-core/build.sh
index 66d827f8..b2c4f36e 100755
--- a/projects/bitcoin-core/build.sh
+++ b/projects/bitcoin-core/build.sh
@@ -19,13 +19,6 @@
 # This will also force static builds
 if [ "$ARCHITECTURE" = "i386" ]; then
   export BUILD_TRIPLET="i686-pc-linux-gnu"
-  # Temporary workaround for:
-  #   CXXLD    test/fuzz/fuzz
-  # test/fuzz/test_fuzz_fuzz-multiplication_overflow.o: In function `void (anonymous namespace)::TestMultiplicationOverflow<long long>(FuzzedDataProvider&)':
-  # /src/bitcoin-core/src/test/fuzz/multiplication_overflow.cpp:30: undefined reference to `__mulodi4'
-  # clang-12: error: linker command failed with exit code 1 (use -v to see invocation)
-  # Makefile:5495: recipe for target 'test/fuzz/fuzz' failed
-  sed -i 's|defined(HAVE_BUILTIN_MUL_OVERFLOW)|defined(IGNORE_BUILTIN_MUL_OVERFLOW)|g' "./src/test/fuzz/multiplication_overflow.cpp"
 else
   export BUILD_TRIPLET="x86_64-pc-linux-gnu"
 fi

rebroad · 2021-05-09T10:23:17Z

@rebroad @MarcoFalke

Does this fix work in your cases?

I'll have a look and let you know

laanwj · 2021-05-10T11:24:49Z

Does this issue only affect building the fuzz binary? This wasn't clear for me from the OP in #21294.

hebasto · 2021-05-10T20:34:47Z

@laanwj

Does this issue only affect building the fuzz binary? This wasn't clear for me from the OP in #21294.

Yes, the OP in #21294 points to some other places, but the exact version of the code is still unknown (or I missed it).

On the current master the bug is reproducible for fuzz binary only (using Armbian 21.02.3 Focal).

laanwj · 2021-05-12T12:20:20Z

On the current master the bug is reproducible for fuzz binary only (using Armbian 21.02.3 Focal).

Makes sense, thanks for letting me know, maybe we can wait a bit for tested confirmation that this solves the referenced issues.

maflcko · 2021-05-12T12:49:39Z

I did test this in #21882 (comment), but I did not review

maflcko · 2021-05-13T17:20:03Z

The steps to reproduce from #21920 (comment) can be used here as well

fanquake

This should probably be broken out into it's own macro, with an explanation of why it's needed.

Is this actually limited to 32-bit? When compiling with Clang 11, on a 64-bit system, it is easy to recreate the same problem. i.e:

int f(__int128 a, __int128 b, __int128 *p) {
  return __builtin_mul_overflow(a, b, p);
}
int main() {}

# clang --version
Ubuntu clang version 11.0.0-2~ubuntu20.04.1
Target: x86_64-pc-linux-gnu

# clang test.c
/usr/bin/ld: /tmp/test-de745b.o: in function 'f':
test.c:(.text+0x61): undefined reference to '__muloti4'

# clang test.c --rtlib=compiler-rt
<success>

Why isn't this broken for 64-bit builds?

fanquake · 2021-05-12T05:21:11Z

configure.ac

+    [
+      AC_MSG_RESULT([no])
+      AX_CHECK_LINK_FLAG([--rtlib=compiler-rt -lgcc_s],
+                         [FUZZ_BINARY_LDFLAGS="--rtlib=compiler-rt -lgcc_s"],


Is linking against GCCs runtime library actually needed?

Yes, it is.

After adding --rtlib=compiler-rt the new linking error appears:

CXXLD bitcoind CXXLD bitcoin-cli CXXLD bitcoin-util CXXLD test/fuzz/fuzz /usr/bin/ld: test/fuzz/fuzz-addition_overflow.o: undefined reference to symbol '__aeabi_unwind_cpp_pr0@@GCC_3.5' /usr/bin/ld: /lib/arm-linux-gnueabihf/libgcc_s.so.1: error adding symbols: DSO missing from command line clang: error: linker command failed with exit code 1 (use -v to see invocation) make[2]: *** [Makefile:6141: test/fuzz/fuzz] Error 1 make[2]: *** Waiting for unfinished jobs.... make[2]: Leaving directory '/home/hebasto/bitcoin/src' make[1]: *** [Makefile:15996: all-recursive] Error 1 make[1]: Leaving directory '/home/hebasto/bitcoin/src' make: *** [Makefile:821: all-recursive] Error 1

On master with the following diff

--- a/src/Makefile.test.include +++ b/src/Makefile.test.include @@ -251,7 +251,6 @@ test_fuzz_fuzz_SOURCES = \ test/fuzz/merkleblock.cpp \ test/fuzz/message.cpp \ test/fuzz/muhash.cpp \ - test/fuzz/multiplication_overflow.cpp \ test/fuzz/net.cpp \ test/fuzz/net_permissions.cpp \ test/fuzz/netaddress.cpp \

no error fires.

https://lists.linaro.org/pipermail/linaro-toolchain/2011-April/001101.html:

__aeabi_unwind_cpp_pr0 is part of the standard ARM exception handling code...

hebasto · 2021-05-14T13:30:14Z

@fanquake

Is this actually limited to 32-bit? When compiling with Clang 11, on a 64-bit system, it is easy to recreate the same problem. i.e:
int f(__int128 a, __int128 b, __int128 *p) {
  return __builtin_mul_overflow(a, b, p);
}
int main() {}

Do we use __builtin_mul_overflow with 128-bit arguments?

Why isn't this broken for 64-bit builds?

https://bugs.webkit.org/show_bug.cgi?id=190208#c4

for 64 bit arguments, Clang cannot produce the code so calls __mulodi4 on 32-bit architectures

hebasto · 2021-05-14T17:09:37Z

Updated 207b4e2 -> 70d89ff (pr21882.02 -> pr21882.03):

addressed @fanquake's comment

This should probably be broken out into it's own macro, with an explanation of why it's needed.

rebased

practicalswift · 2021-05-15T07:53:00Z

Concept ACK

laanwj · 2021-05-17T12:02:13Z

On some level this problem is really strange. You're absolutely not supposed to have to link anything special to be able to use this basic C functionality. Functions with double underscore __ are internal compiler details, unless you're deep into embedded development territory there should be no reason for application builders to be concerned with them.

If this is a workaround for a bug in a specific compiler version, please make this more clear and add a comment so that we know when it can be removed again.

hebasto · 2021-05-17T12:06:50Z

On some level this problem is really strange. You're absolutely not supposed to have to link anything special to be able to use this basic C functionality. Functions with double underscore __ are internal compiler details, unless you're deep into embedded development territory there should be no reason for application builders to be concerned with them.

We are already use double-underscore-named functions:

bitcoin/src/test/fuzz/multiplication_overflow.cpp

Line 30 in 7b87fca

    
           const bool is_multiplication_overflow_builtin = __builtin_mul_overflow(i, j, &result_builtin);

hebasto · 2021-05-17T12:11:03Z

@laanwj

If this is a workaround for a bug in a specific compiler version, please make this more clear and add a comment so that we know when it can be removed again.

I'm not sure about a specific clang version. From https://bugs.llvm.org/show_bug.cgi?id=28629 I can assume that all supported clang versions are affected.

laanwj · 2021-05-17T13:53:02Z

We are already use double-underscore-named functions:

Even there it's a compiler builtin / intrinsic. It's supposed to be part of the compiler or its support code, not a library you have to explicitly link. And I see no calls to __mulodi4 specifically.
To be clear it's not meant as a NACK or anything, but I sometimes worry about the number of one-shot compiler bug workarounds we're accumulating.

maflcko · 2021-05-18T15:00:10Z

Could rebase to simplify testing?

hebasto · 2021-05-18T15:38:33Z

Could rebase to simplify testing?

Done.

maflcko · 2021-05-20T08:32:31Z

tested-only ACK bd55f62

On vanilla Ubuntu Focal:

export DEBIAN_FRONTEND=noninteractive && apt update && apt install curl wget htop git vim ccache -y && git clone https://github.com/bitcoin/bitcoin.git && cd bitcoin && apt install build-essential libtool autotools-dev automake pkg-config bsdmainutils python3-zmq make automake cmake curl clang llvm g++-multilib libtool binutils-gold bsdmainutils pkg-config python3 patch bison -y  && ( cd depends && make DEBUG=1 HOST=i686-pc-linux-gnu NO_QT=1 NO_WALLET=1 NO_ZMQ=1 NO_UPNP=1 NO_NATPMP=1 -j $(nproc) ) && ./autogen.sh && CONFIG_SITE="$PWD/depends/i686-pc-linux-gnu/share/config.site" ./configure CC='clang -m32' CXX='clang++ -m32' --enable-fuzz --with-sanitizers=fuzzer && make  -j $(nproc)

Before:

  AR       libbitcoin_server.a
  AR       libbitcoin_common.a
  AR       libbitcoin_util.a
  AR       libtest_util.a
  AR       crypto/libbitcoin_crypto_base.a
  AR       libbitcoin_consensus.a
  AR       crc32c/libcrc32c.a
  AR       leveldb/libmemenv.a
  AR       leveldb/libleveldb.a
  CXXLD    test/fuzz/fuzz
/usr/bin/ld: test/fuzz/fuzz-multiplication_overflow.o: in function `void (anonymous namespace)::TestMultiplicationOverflow<long long>(FuzzedDataProvider&)':
multiplication_overflow.cpp:(.text._ZN12_GLOBAL__N_126TestMultiplicationOverflowIxEEvR18FuzzedDataProvider[_ZN12_GLOBAL__N_126TestMultiplicationOverflowIxEEvR18FuzzedDataProvider$f74c2a0666fdfec672dc24de475b04f3]+0x8d): undefined reference to `__mulodi4'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [Makefile:6140: test/fuzz/fuzz] Error 1
make[2]: Leaving directory '/bitcoin/src'
make[1]: *** [Makefile:15995: all-recursive] Error 1
make[1]: Leaving directory '/bitcoin/src'
make: *** [Makefile:820: all-recursive] Error 1

After:

Clean

luke-jr · 2021-06-11T22:59:59Z

build-aux/m4/bitcoin_runtime_lib.m4

+
+  AC_LANG_PUSH(C++)
+
+  AC_MSG_CHECKING([whether __builtin_mul_overflow can be used without compiler-rt])


AIUI, this test succeeds with non-clang, but __builtin_mul_overflow doesn't actually get checked at all. Maybe the test itself should be conditional on using clang?

luke-jr · 2021-06-13T19:03:09Z

Perhaps something like this would be better?

diff --git a/build-aux/m4/bitcoin_runtime_lib.m4 b/build-aux/m4/bitcoin_runtime_lib.m4
index 6af5514e6b7..9834b6c7965 100644
--- a/build-aux/m4/bitcoin_runtime_lib.m4
+++ b/build-aux/m4/bitcoin_runtime_lib.m4
@@ -5,14 +5,10 @@
 # - https://bugs.llvm.org/show_bug.cgi?id=28629
 
 m4_define([_CHECK_RUNTIME_testbody], [[
-  #if defined(__clang__) && defined(__has_builtin)
-  #if __has_builtin(__builtin_mul_overflow)
   bool f(long long x, long long y, long long* p)
   {
     return __builtin_mul_overflow(x, y, p);
   }
-  #endif
-  #endif
 
   int main() { return 0; }
 ]])
@@ -21,18 +17,23 @@ AC_DEFUN([CHECK_RUNTIME_LIB], [
 
   AC_LANG_PUSH(C++)
 
-  AC_MSG_CHECKING([whether __builtin_mul_overflow can be used without compiler-rt])
+  AC_MSG_CHECKING([for __builtin_mul_overflow])
 
   AC_LINK_IFELSE([AC_LANG_SOURCE([_CHECK_RUNTIME_testbody])], [
-      AC_MSG_RESULT([yes])
-    ], [
+    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([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])
-      AX_CHECK_LINK_FLAG([--rtlib=compiler-rt -lgcc_s],
-                         [RUNTIME_LDFLAGS="--rtlib=compiler-rt -lgcc_s"],
-                         [AC_MSG_FAILURE([cannot figure out how to use __builtin_mul_overflow])],
-                         [$LDFLAG_WERROR],
-                         [AC_LANG_SOURCE([_CHECK_RUNTIME_testbody])])
     ])
+    LDFLAGS=$ax_check_save_flags
+  ])
 
   AC_LANG_POP
   AC_SUBST(RUNTIME_LDFLAGS)
diff --git a/src/test/fuzz/multiplication_overflow.cpp b/src/test/fuzz/multiplication_overflow.cpp
index a4b158c18b5..9f617668569 100644
--- a/src/test/fuzz/multiplication_overflow.cpp
+++ b/src/test/fuzz/multiplication_overflow.cpp
@@ -2,6 +2,10 @@
 // Distributed under the MIT software license, see the accompanying
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
+#if defined(HAVE_CONFIG_H)
+#include <config/bitcoin-config.h>
+#endif
+
 #include <test/fuzz/FuzzedDataProvider.h>
 #include <test/fuzz/fuzz.h>
 #include <test/fuzz/util.h>
@@ -10,14 +14,6 @@
 #include <string>
 #include <vector>
 
-#if defined(__has_builtin)
-#if __has_builtin(__builtin_mul_overflow)
-#define HAVE_BUILTIN_MUL_OVERFLOW
-#endif
-#elif defined(__GNUC__) && (__GNUC__ >= 5)
-#define HAVE_BUILTIN_MUL_OVERFLOW
-#endif
-
 namespace {
 template <typename T>
 void TestMultiplicationOverflow(FuzzedDataProvider& fuzzed_data_provider)

That way failure to make __builtin_mul_overflow work gracefully takes the "don't have __builtin_mul_overflow" path, and there's less compiler special-case checks involved.

When compiling with clang on 32-bit systems the __mulodi4 symbol is defined in compiler-rt only. Github-Pull: bitcoin#21882 Rebased-From: bd55f62

When compiling with clang on 32-bit systems the __mulodi4 symbol is defined in compiler-rt only.

hebasto · 2021-07-27T11:55:27Z

Updated bd55f62 -> e4c8bb6 (pr21882.04 -> pr21882.05, diff):

addressed @luke-jr's comment

luke-jr

utACK e4c8bb6

maflcko · 2021-07-29T07:09:49Z

tested-only ACK e4c8bb6

Could suffix title with "... in fuzz binary"?

fanquake

ACK e4c8bb6 - it's a bit of an awkward workaround to carry, but at-least it's contained to the fuzzers.

e4c8bb6 build: Fix undefined reference to __mulodi4 (Hennadii Stepanov) Pull request description: When compiling with clang on 32-bit systems the `__mulodi4` symbol is defined in compiler-rt only. Fixes bitcoin#21294. See more: - https://bugs.llvm.org/show_bug.cgi?id=16404 - https://bugs.llvm.org/show_bug.cgi?id=28629 ACKs for top commit: MarcoFalke: tested-only ACK e4c8bb6 luke-jr: utACK e4c8bb6 fanquake: ACK e4c8bb6 - it's a bit of an awkward workaround to carry, but at-least it's contained to the fuzzers. Tree-SHA512: 93edb4ed568027702b1b9aba953ad50889b834ef97fde3cb99d1ce70076d9c00aa13f95c86b12d6f59b24fa90108d93742f920e15119901a2848fb337ab859a1

This should no-longer be necessary now that bitcoin/bitcoin#21882 has been merged upstream.

When compiling with clang on 32-bit systems the __mulodi4 symbol is defined in compiler-rt only. Github-Pull: bitcoin#21882 Rebased-From: e4c8bb6

rebroad · 2021-12-19T07:54:32Z

This is still an issue with clang, as of ac92ab6:-

  CXXLD    qt/bitcoin-qt
qt/libbitcoinqt.a(qt_libbitcoinqt_a-rpcconsole.o): In function `bool std::__detail::__raise_and_add<unsigned long>(unsigned long&, int, unsigned char)':
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/charconv:410: undefined reference to `__muloti4'
libbitcoin_server.a(libbitcoin_server_a-mining.o): In function `_ZSt10from_charsIlENSt9enable_ifIXsr22__is_int_to_chars_typeIT_EE5valueESt17from_chars_resultE4typeEPKcS6_RS1_i':
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/charconv:632: undefined reference to `__muloti4'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Makefile:5767: recipe for target 'qt/bitcoin-qt' failed
make: *** [qt/bitcoin-qt] Error 1

hebasto · 2021-12-19T09:14:36Z

@rebroad

This is still an issue with clang, as of ac92ab6:-

  CXXLD    qt/bitcoin-qt
qt/libbitcoinqt.a(qt_libbitcoinqt_a-rpcconsole.o): In function `bool std::__detail::__raise_and_add<unsigned long>(unsigned long&, int, unsigned char)':
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/charconv:410: undefined reference to `__muloti4'
libbitcoin_server.a(libbitcoin_server_a-mining.o): In function `_ZSt10from_charsIlENSt9enable_ifIXsr22__is_int_to_chars_typeIT_EE5valueESt17from_chars_resultE4typeEPKcS6_RS1_i':
/usr/bin/../lib/gcc/x86_64-linux-gnu/8/../../../../include/c++/8/charconv:632: undefined reference to `__muloti4'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Makefile:5767: recipe for target 'qt/bitcoin-qt' failed
make: *** [qt/bitcoin-qt] Error 1

Are you talking about 0.21? If so it's because this PR has not been backported to 0.21.

rebroad · 2021-12-19T22:55:31Z

@hebasto no, the master branch as of 9 days ago.

backport: merge bitcoin#21404, bitcoin#21415, bitcoin#19314, bitcoin#21882, bitcoin#16939, bitcoin#19084, bitcoin#20602, bitcoin#20253, bitcoin#20480, bitcoin#20736 (remove deprecated logic, use standard library alternatives)

hebasto force-pushed the 210507-fuzz32 branch from 6181447 to 207b4e2 Compare May 7, 2021 21:31

DrahtBot added the Build system label May 7, 2021

fanquake reviewed May 14, 2021

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hebasto marked this pull request as draft May 14, 2021 14:09

hebasto marked this pull request as ready for review May 14, 2021 15:18

hebasto force-pushed the 210507-fuzz32 branch from 207b4e2 to 70d89ff Compare May 14, 2021 17:06

hebasto force-pushed the 210507-fuzz32 branch from 70d89ff to bd55f62 Compare May 18, 2021 15:38

luke-jr reviewed Jun 11, 2021

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hebasto force-pushed the 210507-fuzz32 branch from bd55f62 to 7801f85 Compare July 27, 2021 11:49

build: Fix undefined reference to __mulodi4

e4c8bb6

When compiling with clang on 32-bit systems the __mulodi4 symbol is defined in compiler-rt only.

hebasto force-pushed the 210507-fuzz32 branch from 7801f85 to e4c8bb6 Compare July 27, 2021 11:53

luke-jr approved these changes Jul 28, 2021

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maflcko requested a review from fanquake July 29, 2021 07:09

fanquake approved these changes Jul 29, 2021

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fanquake merged commit d235700 into bitcoin:master Jul 29, 2021

hebasto deleted the 210507-fuzz32 branch July 29, 2021 12:56

fanquake mentioned this pull request Jul 30, 2021

bitcoin: remove i386 HAVE_BUILTIN_MUL_OVERFLOW workaround google/oss-fuzz#6140

Merged

fanquake added a commit to fanquake/oss-fuzz that referenced this pull request Aug 4, 2021

bitcoin: remove i386 HAVE_BUILTIN_MUL_OVERFLOW workaround

01df3ac

This should no-longer be necessary now that bitcoin/bitcoin#21882 has been merged upstream.

inferno-chromium pushed a commit to google/oss-fuzz that referenced this pull request Aug 4, 2021

bitcoin: remove i386 HAVE_BUILTIN_MUL_OVERFLOW workaround (#6140)

ec3c914

This should no-longer be necessary now that bitcoin/bitcoin#21882 has been merged upstream.

luke-jr mentioned this pull request Oct 16, 2021

[22.x] Backports for 22.x #23276

Merged

hebasto mentioned this pull request Dec 19, 2021

v0.21.0 fails to compile on raspbian with clang #21294

Closed

PastaPastaPasta pushed a commit to kwvg/dash that referenced this pull request Oct 20, 2022

merge bitcoin#21882: Fix undefined reference to __mulodi4

6851dbf

bitcoin locked and limited conversation to collaborators Dec 19, 2022


		AC_LANG_PUSH(C++)

		AC_MSG_CHECKING([whether __builtin_mul_overflow can be used without compiler-rt])

build: Fix undefined reference to __mulodi4 #21882

build: Fix undefined reference to __mulodi4 #21882

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