Add Boost.Build variants for UBSan-enabled builds

The build variants enable group of checks offered by clang
UndefinedBehaviorSanitizer detector.

Add sanitizers suppression file in .ci/blacklist.supp based on
copy of the file from Boost.Beast.

Update Travis CI:
  - Add .ci/build-and-test.sh script as handy proxy for b2 command.
  - Add build jobs for each of the three new UBSan variants.
  - Display COMPILER and VARIANT first as these two are most important
    details while inspecting the build matrix
    (TOOLSET can be derived from COMPILER).

.ci/blacklist.supp

@@ -0,0 +1,40 @@
+# LLVM/clang sanitizers suppression file for Boost.GIL
+#
+# Copied from https://github.com/boostorg/beast/blob/develop/tools/blacklist.supp
+#
+# Remember that this blacklist file is GLOBAL to all sanitizers
+# Be therefore extremely careful when considering to add a sanitizer
+# filter here instead of using a runtime suppression
+#
+# Remember also that filters here quite literally completely
+# remove instrumentation altogether, so filtering here means
+# that sanitizers such as tsan will false positive on problems
+# introduced by code filtered here.
+#
+# The main use for this file is ubsan, as it's the only sanitizer
+# without a runtime suppression facility.
+#
+# Be ESPECIALLY careful when filtering out entire source files!
+# Try if at all possible to filter only functions using fun:regex
+# Remember you must use mangled symbol names with fun:regex
+
+# boost/lexical_cast.hpp:1625:43: runtime error: downcast of address 0x7fbb4fffbce8 which does not point to an object of type 'buffer_t' (aka 'parser_buf<std::basic_streambuf<char, char_traits<char> >, char>')
+# Fixed in Boost 1.63.0 https://svn.boost.org/trac/boost/ticket/12889
+#
+fun:*shl_input_streamable*
+
+## The well known ubsan failure in libstdc++ extant for years :)
+# Line 96:24: runtime error: load of value 4294967221, which is not a valid value for type 'std::_Ios_Fmtflags'
+#
+#fun:*_Ios_Fmtflags*
+
+# boost/any.hpp:259:16: runtime error: downcast of address 0x000004392e70 which does not point to an object of type 'any::holder<int>'
+#
+#fun:*any_cast*
+
+# basic_string.h:409:51: runtime error: unsigned integer overflow: 3 - 9 cannot be represented in type 'unsigned long' in std::string::_S_compare(unsigned long, unsigned long)
+fun:*_S_compare*
+fun:*string::compare*
+
+# stl_tree.h:702:24: runtime error: downcast of address 0x000001271b68 with insufficient space for an object of type
+fun:*_Rb_tree*

.ci/build-and-test.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+# Boost.GIL proxy for b2 command on Travis CI (can run locally too)
+set -eu
+
+if [ ! -z ${TRAVIS+x} ] && [ "$TRAVIS" == "true" ] && [ ! -z ${DOC+x} ]; then
+    echo "Documentation build requested, skipping tests build"
+    exit 0
+fi
+
+if [ -z ${TOOLSET+x} ]; then
+    echo "Missing environment TOOLSET"
+    exit 1
+fi
+
+if [ -z ${VARIANT+x} ]; then
+    echo "Missing environment VARIANT"
+    exit 1
+fi
+
+if [ -z ${B2_OPTIONS+x} ]; then
+    B2_OPTIONS=""
+fi
+
+if [ ! -z ${TRAVIS+x} ] && [ "$TRAVIS" == "true" ]; then
+  JOBS="2"
+elif [[ $(uname -s) == "Linux" ]]; then
+  JOBS=$(lscpu -p | grep -v '^#' | sort -u -t, -k 2,4 | wc -l)
+elif [[ $(uname) == "Darwin" ]]; then
+  JOBS=$(sysctl -n hw.physicalcpu)
+else
+  JOBS=1
+fi
+
+echo "Running ./b2 -j $JOBS $B2_OPTIONS toolset=$TOOLSET variant=$VARIANT"
+
+set -euv
+./b2 -j $JOBS $B2_OPTIONS toolset=$TOOLSET variant=$VARIANT libs/gil/test
+./b2 -j $JOBS $B2_OPTIONS toolset=$TOOLSET variant=$VARIANT libs/gil/toolbox/test
+./b2 -j $JOBS $B2_OPTIONS toolset=$TOOLSET variant=$VARIANT libs/gil/numeric/test
+./b2 -j $JOBS $B2_OPTIONS toolset=$TOOLSET variant=$VARIANT libs/gil/io/test//simple

.gitattributes

@@ -52,3 +52,6 @@ CMakeLists.txt      text eol=lf
 *.html              text
 *.txt               text
 *.yml               text
+
+# sanitizers suppression
+*.supp              text eol=lf

.travis.yml

@@ -19,7 +19,6 @@ branches:
 env:
   global:
     - secure: "UHit2f6Hq2pkHvx8rfrQvFacYiQKVO3vrCbNuDi/VSAIzQjRnqCqE06y4vpXLMsXf62TvBeCBStIuI8g+HP8B+f39oGb/9Om+yIgN/yes47R4sLFKFbRiOS6sfCIefJp7Kx7GSFf81xWxStpIU4QaSsk8Dlt5xyurTWXFSde+lQ="
-
   matrix:
     - BOGUS_JOB=true
 
@@ -28,7 +27,7 @@ matrix:
     - env: BOGUS_JOB=true
   include:
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=c++11 VARIANT=debug
+      env: COMPILER=g++-5 VARIANT=debug TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -37,7 +36,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-5 CXXSTD=c++11 VARIANT=release
+      env: COMPILER=g++-5 VARIANT=release TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -46,7 +45,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++11 VARIANT=debug
+      env: COMPILER=g++-6 VARIANT=debug TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -55,7 +54,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-6 CXXSTD=c++11 VARIANT=release
+      env: COMPILER=g++-6 VARIANT=release TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -64,7 +63,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=c++11 VARIANT=debug
+      env: COMPILER=g++-7 VARIANT=debug TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -73,7 +72,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=gcc COMPILER=g++-7 CXXSTD=c++11 VARIANT=release
+      env: COMPILER=g++-7 VARIANT=release TOOLSET=gcc CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -82,7 +81,7 @@ matrix:
             - ubuntu-toolchain-r-test
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++11 VARIANT=debug
+      env: COMPILER=clang++-3.9 VARIANT=debug TOOLSET=clang CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -92,7 +91,7 @@ matrix:
             - llvm-toolchain-precise-3.9
 
     - os: linux
-      env: TOOLSET=clang COMPILER=clang++-3.9 CXXSTD=c++11 VARIANT=release
+      env: COMPILER=clang++-3.9 VARIANT=release TOOLSET=clang CXXSTD=c++11
       addons:
         apt:
           packages:
@@ -101,11 +100,41 @@ matrix:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.9
 
-    - os: osx
+    - os: linux
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11 VARIANT=debug
+      env: COMPILER=clang++-5.0 VARIANT=ubsan_integer TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+      addons:
+        apt:
+          packages:
+          - clang-5.0
+          sources:
+          - ubuntu-toolchain-r-test
+          - llvm-toolchain-trusty-5.0
+
+    - os: linux
+      env: COMPILER=clang++-5.0 VARIANT=ubsan_undefined TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+      addons:
+        apt:
+          packages:
+          - clang-5.0
+          sources:
+          - ubuntu-toolchain-r-test
+          - llvm-toolchain-trusty-5.0
+
+    - os: linux
+      env: COMPILER=clang++-5.0 VARIANT=ubsan_nullability TOOLSET=clang CXXSTD=c++11 UBSAN_OPTIONS='print_stacktrace=1'
+      addons:
+        apt:
+          packages:
+          - clang-5.0
+          sources:
+          - ubuntu-toolchain-r-test
+          - llvm-toolchain-trusty-5.0
 
     - os: osx
-      env: TOOLSET=clang COMPILER=clang++ CXXSTD=c++11 VARIANT=release
+      env: COMPILER=clang++ VARIANT=debug TOOLSET=clang CXXSTD=c++11
+
+    - os: osx
+      env: COMPILER=clang++ VARIANT=release TOOLSET=clang CXXSTD=c++11
 
     - env: DOC=1
       addons:
@@ -135,25 +164,21 @@ script:
     if [ "$DOC" ]; then
       echo "using doxygen ;" > ~/user-config.jam
       ./b2 libs/gil/doc
-    else
-      echo "using $TOOLSET : : $COMPILER : <cxxflags>-std=$CXXSTD ;" > ~/user-config.jam
-      ./b2 libs/gil/test toolset=$TOOLSET variant=$VARIANT
-      ./b2 libs/gil/toolbox/test toolset=$TOOLSET variant=$VARIANT
-      ./b2 libs/gil/numeric/test toolset=$TOOLSET variant=$VARIANT
-      ./b2 libs/gil/io/test//simple toolset=$TOOLSET variant=$VARIANT
     fi
+  - |-
+    echo "using $TOOLSET : : $COMPILER : <cxxflags>-std=$CXXSTD ;" > ~/user-config.jam
+  - travis_retry libs/gil/.ci/build-and-test.sh
 
 after_success:
 # Upload docs only when building upstream.
-- |
+  - |-
-   if [ "$DOC" -a \
+    if [ "$DOC" -a \
-        "$TRAVIS_REPO_SLUG" = "boostorg/gil" -a \
+          "$TRAVIS_REPO_SLUG" = "boostorg/gil" -a \
-        "$TRAVIS_PULL_REQUEST" = "false" ]; then
+          "$TRAVIS_PULL_REQUEST" = "false" ]; then
-     export GH_TOKEN
+      export GH_TOKEN
-     cd libs/gil
+      cd libs/gil
-     .ci/upload_docs.sh
+      .ci/upload_docs.sh
-   fi
+    fi
-
 
 notifications:
   email:

Jamfile

@@ -1,11 +1,41 @@
 # Boost.GIL (Generic Image Library)
 #
+# Copyright (c) 2013-2017 Vinnie Falco (vinnie dot falco at gmail dot com)
 # Copyright (c) 2018 Mateusz Loskot <mateusz@loskot.net>
 #
 # Use, modification and distribution is subject to the Boost Software License,
 # Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 # http://www.boost.org/LICENSE_1_0.txt)
 
+# TODO: Remove -Wno-unused below once tests have been cleaned up, and no longer use of assert() macro, etc.
+
+variant ubsan_integer
+    : release
+    :
+    <cxxflags>"-std=c++11 -Wno-unused -fstrict-aliasing -fno-omit-frame-pointer -fsanitize=integer -fno-sanitize-recover=integer -fsanitize-blacklist=libs/gil/.ci/blacklist.supp"
+    <linkflags>"-fsanitize=integer"
+    <debug-symbols>on
+    <define>BOOST_USE_ASAN=1
+    ;
+
+variant ubsan_nullability
+    : release
+    :
+    <cxxflags>"-std=c++11 -Wno-unused -fstrict-aliasing -fno-omit-frame-pointer -fsanitize=nullability -fno-sanitize-recover=nullability -fsanitize-blacklist=libs/gil/.ci/blacklist.supp"
+    <linkflags>"-fsanitize=nullability"
+    <debug-symbols>on
+    <define>BOOST_USE_ASAN=1
+    ;
+
+variant ubsan_undefined
+    : release
+    :
+    <cxxflags>"-std=c++11 -Wno-unused -fstrict-aliasing -fno-omit-frame-pointer -fsanitize=undefined -fno-sanitize-recover=undefined -fsanitize-blacklist=libs/gil/.ci/blacklist.supp"
+    <linkflags>"-fsanitize=undefined"
+    <debug-symbols>on
+    <define>BOOST_USE_ASAN=1
+    ;
+
 project boost-gil
     :
     requirements
@@ -17,7 +47,9 @@ project boost-gil
         <toolset>intel:<debug-symbols>off
         <toolset>gcc:<cxxflags>"-std=c++11 -pedantic -fstrict-aliasing -Wconversion -Wextra -Wfloat-equal -Wshadow -Wsign-promo -Wstrict-aliasing -Wunused-parameter "
         <toolset>darwin:<cxxflags>"-std=c++11 -pedantic -fstrict-aliasing -Wconversion -Wextra -Wfloat-equal -Wshadow -Wsign-promo -Wstrict-aliasing -Wunused-parameter "
-        <toolset>clang:<cxxflags>"-std=c++11 -pedantic -fstrict-aliasing -Wconversion -Wextra -Wfloat-equal -Wshadow -Wsign-promo -Wstrict-aliasing -Wunused-parameter -Wsign-conversion"
+        # variant filter for clang is necessary to allow ubsan_* variants declare distinct set of <cxxflags>
+        <toolset>clang,<variant>debug:<cxxflags>"-std=c++11 -pedantic -fstrict-aliasing -Wconversion -Wextra -Wfloat-equal -Wshadow -Wsign-promo -Wstrict-aliasing -Wunused-parameter -Wsign-conversion"
+        <toolset>clang,<variant>release:<cxxflags>"-std=c++11 -pedantic -fstrict-aliasing -Wconversion -Wextra -Wfloat-equal -Wshadow -Wsign-promo -Wstrict-aliasing -Wunused-parameter -Wsign-conversion"
     ;
 
 build-project example ;