B2 4.6.0 release.

bfgroup · Jun 1, 2021 · 172da13 · 172da13
2 parents f3fc6c9 + b785543
commit 172da13
Show file tree

Hide file tree

Showing 37 changed files with 713 additions and 465 deletions.
diff --git a/.cirrus.yml b/.cirrus.yml
@@ -2,7 +2,7 @@
 # subject to the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE.txt)
 #
-# Copyright René Ferdinand Rivera Morell 2020.
+# Copyright René Ferdinand Rivera Morell 2020-2021.
 
 freebsd_task:
   # All the GCC's and Clang's currently supported by FreeBSD ports.
@@ -12,17 +12,19 @@ freebsd_task:
     - { name: 'FreeBSD, GCC 9', env: { TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: 'g++9', PACKAGE: 'gcc9-devel' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, GCC 8', env: { TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: 'g++8', PACKAGE: 'gcc8-devel' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, GCC 7', env: { TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: 'g++7', PACKAGE: 'gcc7' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
+    - { name: 'FreeBSD, Clang 12', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++12', PACKAGE: 'llvm12' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
+    - { name: 'FreeBSD, Clang 11', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++11', PACKAGE: 'llvm11' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, Clang 10', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++10', PACKAGE: 'llvm10' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, Clang 9', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++90', PACKAGE: 'llvm90' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, Clang 8', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++80', PACKAGE: 'llvm80' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
     - { name: 'FreeBSD, Clang 7', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++70', PACKAGE: 'llvm70' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
-    - { name: 'FreeBSD, Clang 6', env: { TOOLSET: clang, TEST_TOOLSET: clang, CXX: 'clang++60', PACKAGE: 'llvm60' }, freebsd_instance: { image_family: 'freebsd-12-2' } }
   # To install with ports we need to initialize the package manager. To avoid
   # confirmation prompts we need to set an env var.
   install_script: [
     "uname -a",
     "env ASSUME_ALWAYS_YES=YES pkg bootstrap",
-    "env ASSUME_ALWAYS_YES=YES pkg install ${PACKAGE}"
+    "env ASSUME_ALWAYS_YES=YES pkg install ${PACKAGE}",
+    "env ASSUME_ALWAYS_YES=YES pkg install python3"
     ]
   # Build the engine.
   build_script: [
@@ -38,6 +40,6 @@ freebsd_task:
     "CXX_PATH=`which ${CXX}`",
     "cd test",
     "echo \"using ${TEST_TOOLSET} : : ${CXX_PATH} ;\" > ${HOME}/user-config.jam",
-    "python2 test_all.py ${TEST_TOOLSET}",
+    "python3 test_all.py ${TEST_TOOLSET}",
     "cd ..",
   ]
diff --git a/Jamroot.jam b/Jamroot.jam
@@ -142,11 +142,18 @@ else
     alias python ;
 }
 
+obj jamgram.obj
+    :   jamgram.cpp
+    :   <toolset>gcc:<cxxflags>-Wno-free-nonheap-object
+    ;
+explicit jamgram.obj ;
+
 local b2_src =
     [ glob src/engine/*.cpp src/engine/modules/*.cpp :
         src/engine/*nt.cpp src/engine/*unix.cpp src/engine/*vms.cpp
         src/engine/yyacc.cpp src/engine/mkjambase.cpp
         src/engine/check_cxx11.cpp
+        src/engine/jamgram.cpp
         ] ;
 local b2_src_nt = [ glob src/engine/*nt.cpp ] ;
 local b2_src_unix = [ glob src/engine/*unix.cpp ] ;
@@ -155,11 +162,11 @@ local unix_os = [ set.difference [ feature.values <target-os> ] : windows vms ]
 
 exe b2
     :   $(b2_src)
+        jamgram.obj
         python
     :   <target-os>windows:<source>$(b2_src_nt)
         <target-os>vms:<source>$(b2_src_vms)
         <target-os>$(unix_os):<source>$(b2_src_unix)
-        <dependency>jamgram.cpp
         <toolset>msvc:<find-static-library>kernel32
         <toolset>msvc:<find-static-library>advapi32
         <toolset>msvc:<find-static-library>user32

diff --git a/README.adoc b/README.adoc
@@ -16,9 +16,9 @@ Continuously tested on:
 
 * FreeBSD Clang 6, 7, 8, 9
 * FreeBSD GCC 6, 7, 8, 9, 10, 11
-* Linux Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11
-* Linux GCC 4.7, 4.8, 4.9, 5, 6, 7, 8, 9, 10
-* macOS Xcode 10.0, 10.1, 10.2, 10.2.1, 11.2.1, 11.3, 11.3.1, 11.4.1, 11.5, 11.6, 11.7, 12.0.1, 12.1.1, 12.2
+* Linux Clang 3.5, 3.6, 3.7, 3.8, 3.9, 4, 5, 6, 7, 8, 9, 10, 11, 12
+* Linux GCC 4.7, 4.8, 4.9, 5, 6, 7, 8, 9, 10, 11
+* macOS Xcode 10.0, 10.1, 10.2, 10.2.1, 11.2.1, 11.3, 11.3.1, 11.4.1, 11.5, 11.6, 11.7, 12.0.1, 12.1.1, 12.2, 12.3, 12.4
 * Windows MinGW 8.1.0
 * Windows VS 2013, 2015, 2017, 2019
 

diff --git a/azure-pipelines.yml b/azure-pipelines.yml
@@ -30,7 +30,7 @@ stages:
   - job: 'Linux_Default_Build'
     strategy:
       matrix:
-        Clang 11: {PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11, VM_IMAGE: 'ubuntu-latest'}
+        Clang 12: {PACKAGES: clang-12, LLVM_OS: focal, LLVM_VER: 12, VM_IMAGE: 'ubuntu-latest'}
     pool:
       vmImage: $(VM_IMAGE)
     steps:
@@ -47,7 +47,7 @@ stages:
   - job: 'Linux_Clang_Only_Build'
     strategy:
       matrix:
-        Clang 11: {PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11, VM_IMAGE: 'ubuntu-latest'}
+        Clang 12: {PACKAGES: clang-12, LLVM_OS: focal, LLVM_VER: 12, VM_IMAGE: 'ubuntu-latest'}
     pool:
       vmImage: $(VM_IMAGE)
     steps:
@@ -65,8 +65,8 @@ stages:
   - job: 'Linux_Latest'
     strategy:
       matrix:
-        GCC 10: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10, VM_IMAGE: 'ubuntu-latest'}
-        Clang 11: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-11, PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11, VM_IMAGE: 'ubuntu-latest'}
+        GCC 11: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11, VM_IMAGE: 'ubuntu-latest'}
+        Clang 12: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-12, PACKAGES: clang-12, LLVM_OS: focal, LLVM_VER: 12, VM_IMAGE: 'ubuntu-latest'}
     pool:
       vmImage: $(VM_IMAGE)
     steps:
@@ -84,7 +84,7 @@ stages:
   - job: 'macOS'
     strategy:
       matrix:
-        Xcode 12.3: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app, VM_IMAGE: 'macOS-latest'}
+        Xcode 12.4: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app, VM_IMAGE: 'macOS-latest'}
     pool:
       vmImage: $(VM_IMAGE)
     steps:
@@ -97,6 +97,7 @@ stages:
   - job: 'Linux'
     strategy:
       matrix:
+        GCC 10: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10, VM_IMAGE: 'ubuntu-latest'}
         GCC 9: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-9, PACKAGES: g++-9, VM_IMAGE: 'ubuntu-18.04'}
         GCC 8: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-8, PACKAGES: g++-8, VM_IMAGE: 'ubuntu-18.04'}
         GCC 7: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-7, PACKAGES: g++-7, VM_IMAGE: 'ubuntu-18.04'}
@@ -105,6 +106,7 @@ stages:
         GCC 4.9: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-4.9, PACKAGES: g++-4.9, VM_IMAGE: 'ubuntu-16.04'}
         GCC 4.8: {TOOLSET: gcc, TEST_TOOLSET: gcc,  CXX: g++-4.8, PACKAGES: g++-4.8, VM_IMAGE: 'ubuntu-16.04'}
         GCC 4.7: {TOOLSET: gcc, TEST_TOOLSET: gcc, CXX: g++-4.7, PACKAGES: g++-4.7, VM_IMAGE: 'ubuntu-16.04'}
+        Clang 11: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-11, PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11, VM_IMAGE: 'ubuntu-latest'}
         Clang 10: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-10, PACKAGES: clang-10, LLVM_OS: bionic, LLVM_VER: 10, VM_IMAGE: 'ubuntu-18.04'}
         Clang 9: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-9, PACKAGES: clang-9, LLVM_OS: bionic, LLVM_VER: 9, VM_IMAGE: 'ubuntu-18.04'}
         Clang 8: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++-8, PACKAGES: clang-8, LLVM_OS: bionic, LLVM_VER: 8, VM_IMAGE: 'ubuntu-18.04'}
@@ -135,6 +137,7 @@ stages:
   - job: 'macOS'
     strategy:
       matrix:
+        Xcode 12.3: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app, VM_IMAGE: 'macOS-latest'}
         Xcode 12.2: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.2.app, VM_IMAGE: 'macOS-10.15'}
         Xcode 12.1.1: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.1.1.app, VM_IMAGE: 'macOS-10.15'}
         Xcode 12.0.1: {TOOLSET: clang, TEST_TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.0.1.app, VM_IMAGE: 'macOS-10.15'}
@@ -164,10 +167,10 @@ stages:
       vmImage: 'ubuntu-latest'
     strategy:
       matrix:
-        Master .. GCC 10: {BOOST_BRANCH: master, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        Master .. Clang 11: {BOOST_BRANCH: master, TOOLSET: clang, CXX: clang++-11, PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11}
-        Develop .. GCC 10: {BOOST_BRANCH: develop, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        Develop .. Clang 11: {BOOST_BRANCH: develop, TOOLSET: clang, CXX: clang++-11, PACKAGES: clang-11, LLVM_OS: focal, LLVM_VER: 11}
+        Master .. GCC 11: {BOOST_BRANCH: master, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        Master .. Clang 12: {BOOST_BRANCH: master, TOOLSET: clang, CXX: clang++-12, PACKAGES: clang-12, LLVM_OS: focal, LLVM_VER: 12}
+        Develop .. GCC 11: {BOOST_BRANCH: develop, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-11}
+        Develop .. Clang 12: {BOOST_BRANCH: develop, TOOLSET: clang, CXX: clang++-12, PACKAGES: clang-12, LLVM_OS: focal, LLVM_VER: 12}
     steps:
     - bash: |
         set -e
@@ -198,8 +201,8 @@ stages:
       vmImage: 'macOS-latest'
     strategy:
       matrix:
-        Master .. Xcode 12.3: {BOOST_BRANCH: master, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        Develop .. Xcode 12.3: {BOOST_BRANCH: develop, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
+        Master .. Xcode 12.4: {BOOST_BRANCH: master, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        Develop .. Xcode 12.4: {BOOST_BRANCH: develop, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
     steps:
     - bash: |
         set -e
@@ -264,16 +267,17 @@ stages:
       vmImage: 'ubuntu-latest'
     strategy:
       matrix:
-        1.75.0 .. GCC 10: {BOOST_VERSION: 1.75.0, BOOST_VERSION_U: 1_75_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.74.0 .. GCC 10: {BOOST_VERSION: 1.74.0, BOOST_VERSION_U: 1_74_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.73.0 .. GCC 10: {BOOST_VERSION: 1.73.0, BOOST_VERSION_U: 1_73_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.72.0 .. GCC 10: {BOOST_VERSION: 1.72.0, BOOST_VERSION_U: 1_72_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.71.0 .. GCC 10: {BOOST_VERSION: 1.71.0, BOOST_VERSION_U: 1_71_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.70.0 .. GCC 10: {BOOST_VERSION: 1.70.0, BOOST_VERSION_U: 1_70_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.69.0 .. GCC 10: {BOOST_VERSION: 1.69.0, BOOST_VERSION_U: 1_69_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.68.0 .. GCC 10: {BOOST_VERSION: 1.68.0, BOOST_VERSION_U: 1_68_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.67.0 .. GCC 10: {BOOST_VERSION: 1.67.0, BOOST_VERSION_U: 1_67_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
-        1.66.0 .. GCC 10: {BOOST_VERSION: 1.66.0, BOOST_VERSION_U: 1_66_0, TOOLSET: gcc, CXX: g++-10, PACKAGES: g++-10}
+        1.76.0 .. GCC 11: {BOOST_VERSION: 1.76.0, BOOST_VERSION_U: 1_76_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.75.0 .. GCC 11: {BOOST_VERSION: 1.75.0, BOOST_VERSION_U: 1_75_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.74.0 .. GCC 11: {BOOST_VERSION: 1.74.0, BOOST_VERSION_U: 1_74_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.73.0 .. GCC 11: {BOOST_VERSION: 1.73.0, BOOST_VERSION_U: 1_73_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.72.0 .. GCC 11: {BOOST_VERSION: 1.72.0, BOOST_VERSION_U: 1_72_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.71.0 .. GCC 11: {BOOST_VERSION: 1.71.0, BOOST_VERSION_U: 1_71_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.70.0 .. GCC 11: {BOOST_VERSION: 1.70.0, BOOST_VERSION_U: 1_70_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.69.0 .. GCC 11: {BOOST_VERSION: 1.69.0, BOOST_VERSION_U: 1_69_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.68.0 .. GCC 11: {BOOST_VERSION: 1.68.0, BOOST_VERSION_U: 1_68_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.67.0 .. GCC 11: {BOOST_VERSION: 1.67.0, BOOST_VERSION_U: 1_67_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
+        1.66.0 .. GCC 11: {BOOST_VERSION: 1.66.0, BOOST_VERSION_U: 1_66_0, TOOLSET: gcc, CXX: g++-11, PACKAGES: g++-11}
     steps:
     - bash: |
         set -e
@@ -303,16 +307,17 @@ stages:
       vmImage: 'macOS-latest'
     strategy:
       matrix:
-        1.75.0 .. Xcode 12.3: {BOOST_VERSION: 1.75.0, BOOST_VERSION_U: 1_75_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.74.0 .. Xcode 12.3: {BOOST_VERSION: 1.74.0, BOOST_VERSION_U: 1_74_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.73.0 .. Xcode 12.3: {BOOST_VERSION: 1.73.0, BOOST_VERSION_U: 1_73_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.72.0 .. Xcode 12.3: {BOOST_VERSION: 1.72.0, BOOST_VERSION_U: 1_72_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.71.0 .. Xcode 12.3: {BOOST_VERSION: 1.71.0, BOOST_VERSION_U: 1_71_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.70.0 .. Xcode 12.3: {BOOST_VERSION: 1.70.0, BOOST_VERSION_U: 1_70_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.69.0 .. Xcode 12.3: {BOOST_VERSION: 1.69.0, BOOST_VERSION_U: 1_69_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.68.0 .. Xcode 12.3: {BOOST_VERSION: 1.68.0, BOOST_VERSION_U: 1_68_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.67.0 .. Xcode 12.3: {BOOST_VERSION: 1.67.0, BOOST_VERSION_U: 1_67_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
-        1.66.0 .. Xcode 12.3: {BOOST_VERSION: 1.66.0, BOOST_VERSION_U: 1_66_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.3.app}
+        1.76.0 .. Xcode 12.4: {BOOST_VERSION: 1.76.0, BOOST_VERSION_U: 1_76_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.75.0 .. Xcode 12.4: {BOOST_VERSION: 1.75.0, BOOST_VERSION_U: 1_75_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.74.0 .. Xcode 12.4: {BOOST_VERSION: 1.74.0, BOOST_VERSION_U: 1_74_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.73.0 .. Xcode 12.4: {BOOST_VERSION: 1.73.0, BOOST_VERSION_U: 1_73_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.72.0 .. Xcode 12.4: {BOOST_VERSION: 1.72.0, BOOST_VERSION_U: 1_72_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.71.0 .. Xcode 12.4: {BOOST_VERSION: 1.71.0, BOOST_VERSION_U: 1_71_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.70.0 .. Xcode 12.4: {BOOST_VERSION: 1.70.0, BOOST_VERSION_U: 1_70_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.69.0 .. Xcode 12.4: {BOOST_VERSION: 1.69.0, BOOST_VERSION_U: 1_69_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.68.0 .. Xcode 12.4: {BOOST_VERSION: 1.68.0, BOOST_VERSION_U: 1_68_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.67.0 .. Xcode 12.4: {BOOST_VERSION: 1.67.0, BOOST_VERSION_U: 1_67_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
+        1.66.0 .. Xcode 12.4: {BOOST_VERSION: 1.66.0, BOOST_VERSION_U: 1_66_0, TOOLSET: clang, CXX: clang++, XCODE_APP: /Applications/Xcode_12.4.app}
     steps:
     - bash: |
         set -e
@@ -343,6 +348,7 @@ stages:
       vmImage: 'windows-latest'
     strategy:
       matrix:
+        1.76.0 .. VS 2019: {BOOST_VERSION: 1.76.0, BOOST_VERSION_U: 1_76_0, TOOLSET: vc142}
         1.75.0 .. VS 2019: {BOOST_VERSION: 1.75.0, BOOST_VERSION_U: 1_75_0, TOOLSET: vc142}
         1.74.0 .. VS 2019: {BOOST_VERSION: 1.74.0, BOOST_VERSION_U: 1_74_0, TOOLSET: vc142}
         1.73.0 .. VS 2019: {BOOST_VERSION: 1.73.0, BOOST_VERSION_U: 1_73_0, TOOLSET: vc142}

diff --git a/bootstrap.sh b/bootstrap.sh
@@ -10,7 +10,7 @@
 # Build b2
 echo "Building the B2 engine.."
 pwd=`pwd`
-"${pwd}/src/engine/build.sh" "$*"
+"${pwd}/src/engine/build.sh" "$@"
 if [ $? -ne 0 ]; then
     echo
     echo "Failed to build the B2 engine." 1>&2

diff --git a/doc/src/history.adoc b/doc/src/history.adoc
@@ -1,6 +1,51 @@
 [[b2.history]]
 = History
 
+== Version 4.6.0
+
+This release wraps up a few new features that make using some toolsets easier
+(thanks to Nikita). It's now also possible to specify empty flags features on
+the command line, like `cxxfalgs=`, and have those be ignored. This helps to
+make CI scripts shorter as they don't need to handle those cases specially.
+And as usual there are many bug fixes and adjustments. Thanks to everyone who
+contributed to this release.
+
+* *New:* Allow clang toolset to be auto-configured to a specific version by using
+  `toolset=clang-xx` on the command line.
+  -- _Nikita Kniazev_
+* *New:* Include pch header automatically and on-demand on gcc and msvc toolset to
+  mirror clang functionality.
+  -- _Nikita Kniazev_
+* *New:* Features that are narked as 'free' and 'optional' will now be ignored when
+  the value specified on the command line is empty. Hence once can specify
+  `cxxflags=` on the command line without errors.
+  -- _René Ferdinand Rivera Morell_
+* Preserve `bootstrap.sh` invoke arguments to forward to the `build.sh` script.
+  -- _tkoecker_
+* Remove use of `local` in `buils.sh` to be compatible with some, not fully
+  capable, shells.
+  -- _Tanzinul Islam_
+* Workaround shell array ref error in `build.sh` on busybox shells.
+  -- _tkoecker_
+* Check for needing `-pthread` to build engine with gcc on some platforms.
+  -- _tkoecker_
+* Default to using clang on MacOS.
+  -- _Stéphan Kochen_
+* Add `/python//numpy` target to use as a dependency to communicate version
+  specific properties.
+  -- _Peter Dimov_
+* Add default value for cxx and cxxflags from env vars `CXX` and `CXXFLAGS`
+  when using the custom `cxx` toolset to build the engine.
+  -- _Samuel Debionne_ and _René Ferdinand Rivera Morell_
+* Fix detection of `intel-linux` toolset installation when only the compiler
+  executable is in the `PATH`.
+  -- _René Ferdinand Rivera Morell_
+* Fix `b2` executable path determination for platforms that don't have a
+  native method of getting the path to executables, like OpenBSD.
+  -- _René Ferdinand Rivera Morell_
+* Fix `property.find` error message.
+  -- _Thomas Brown_
+
 == Version 4.5.0
 
 Some minor fixes to improve some old issues.

diff --git a/doc/src/tasks.adoc b/doc/src/tasks.adoc
@@ -556,9 +556,7 @@ To use precompiled headers, follow the following steps:
 1. Create a header that includes headers used by your project that you
 want precompiled. It is better to include only headers that are
 sufficiently stable -- like headers from the compiler and external
-libraries. Please wrap the header in `#ifdef BOOST_BUILD_PCH_ENABLED`, so
-that the potentially expensive inclusion of headers is not done when PCH is
-not enabled. Include the new header at the top of your source files.
+libraries. B2 will include the header automatically and on-demand.
 
 2. Declare a new B2 target for the precompiled header and add
 that precompiled header to the sources of the target whose compilation
@@ -577,8 +575,6 @@ The `pch` example in B2 distribution can be used as reference.
 
 Please note the following:
 
-* The inclusion of the precompiled header must be the first thing in a
-source file, before any code or preprocessor directives.
 * The build properties used to compile the source files and the
 precompiled header must be the same. Consider using project requirements
 to assure this.
@@ -592,6 +588,9 @@ headers are not supported.
 namespaces in precompiled headers, which limits their utility. See the
 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29085[bug report] for
 details.
+* Previosuly B2 had not been automatically inluding the header, a user
+was required to include the header at the top of every source file
+the precompiled header will be used with.
 
 [[bbv2.reference.generated_headers]]
 == Generated headers