gcc/clang: -m* flags when architecture is not explicitly set

GCC is picky, -m32/-m64 flags are available only on a subset of targets. Clang supports -m32/-m64 universally.

.ci/azp-linux-test.yml

@@ -1,3 +1,8 @@
+parameters:
+- name: b2_opts
+  type: string
+  default: ''
+
 steps:
 - bash: |
     set -e
@@ -26,16 +31,16 @@ steps:
   displayName: Test
 - bash: |
     set -e
-    ./src/engine/b2 b2 warnings-as-errors=on variant=debug,release address-model=32,64 toolset=${TOOLSET}
+    ./src/engine/b2 b2 warnings-as-errors=on variant=debug,release ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
   displayName: "No Warnings"
 - bash: |
     set -e
     ./bootstrap.sh ${TOOLSET}
-    ./b2 --prefix=$HOME/temp/.b2 install toolset=${TOOLSET}
+    ./b2 --prefix=$HOME/temp/.b2 install ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
     rm ./b2
     export PATH=$HOME/temp/.b2/bin:$PATH
     cd $HOME
     touch build.jam
     b2 -v
-    b2 -n --debug-configuration toolset=${TOOLSET}
+    b2 -n --debug-configuration ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
   displayName: Bootstrap

.ci/azp-macos-test.yml

@@ -1,3 +1,8 @@
+parameters:
+- name: b2_opts
+  type: string
+  default: ''
+
 steps:
 - bash: |
     set -e
@@ -20,16 +25,16 @@ steps:
   displayName: Test
 - bash: |
     set -e
-    ./src/engine/b2 b2 warnings-as-errors=on variant=debug,release address-model=32,64 ${TOOLSET:+toolset=$TOOLSET}
+    ./src/engine/b2 b2 warnings-as-errors=on variant=debug,release ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
   displayName: "No Warnings"
 - bash: |
     set -e
     ./bootstrap.sh ${TOOLSET}
-    ./b2 --prefix=$HOME/temp/.b2 install ${TOOLSET:+toolset=$TOOLSET}
+    ./b2 --prefix=$HOME/temp/.b2 install ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
     rm ./b2
     export PATH=$HOME/temp/.b2/bin:$PATH
     cd $HOME
     touch build.jam
     b2 -v
-    b2 -n --debug-configuration ${TOOLSET:+toolset=$TOOLSET}
+    b2 -n --debug-configuration ${TOOLSET:+toolset=$TOOLSET} ${{ parameters.b2_opts }}
   displayName: Bootstrap

.ci/azp-windows-test.yml

@@ -1,3 +1,8 @@
+parameters:
+- name: b2_opts
+  type: string
+  default: ''
+
 steps:
 - powershell: |
     Set-PSDebug -Trace 1
@@ -22,19 +27,19 @@ steps:
     $env:HOME = $env:HOMEDRIVE + $env:HOMEPATH
     $env:path += ';' + $env:CXX_PATH
     echo "using" $env:TEST_TOOLSET ":" ":" $env:CXX ";" > ${env:HOME}/user-config.jam
-    ./src/engine/b2.exe --debug-configuration b2 warnings-as-errors=on variant=debug,release toolset=$env:TEST_TOOLSET
+    ./src/engine/b2.exe --debug-configuration b2 warnings-as-errors=on variant=debug,release toolset=$env:TEST_TOOLSET ${{ parameters.b2_opts }}
   displayName: "No Warnings"
 - powershell: |
     Set-PSDebug -Trace 1
     $env:HOME = $env:HOMEDRIVE + $env:HOMEPATH
     $env:path += ';' + $env:CXX_PATH
     echo "using" $env:TEST_TOOLSET ":" ":" $env:CXX ";" > ${env:HOME}/user-config.jam
     ./bootstrap.bat $env:TOOLSET
-    ./b2.exe --debug-configuration --prefix=${env:HOME}/temp/.b2 install toolset=$env:TEST_TOOLSET
+    ./b2.exe --debug-configuration --prefix=${env:HOME}/temp/.b2 install toolset=$env:TEST_TOOLSET ${{ parameters.b2_opts }}
     Remove-Item ./b2.exe
     $env:path += $env:HOME + '/temp/.b2' + ';' + $env:PATH
     cd $env:HOME
     echo $null >> build.jam
     b2 -v
-    b2 -n --debug-configuration
+    b2 -n --debug-configuration toolset=$env:TEST_TOOLSET ${{ parameters.b2_opts }}
   displayName: Bootstrap

azure-pipelines.yml

@@ -35,6 +35,7 @@ variables:
 - { name: linux_latest_os, value: 'focal' }
 - { name: windows_latest_vm, value: 'windows-2022' }
 - { name: clang_latest, value: '17' }
+- { name: clang_latest_libstd++, value: 9 }
 - { name: gcc_latest, value: '13' }
 - { name: vc_latest, value: 'vc143' }
 - { name: vs_latest, value: '2022' }
@@ -91,12 +92,14 @@ stages:
   - job: 'Linux_Latest'
     strategy:
       matrix:
-        GCC ${{variables.gcc_latest}}: {TOOLSET: "gcc-${{variables.gcc_latest}}", PACKAGES: "g++-${{variables.gcc_latest}}", VM_IMAGE: "${{variables.linux_latest_vm}}"}
-        Clang ${{variables.clang_latest}}: {TOOLSET: "clang-${{variables.clang_latest}}", PACKAGES: "clang-${{variables.clang_latest}}", LLVM_OS: "${{variables.linux_latest_os}}", LLVM_VER: "${{variables.clang_latest}}", VM_IMAGE: "${{variables.linux_latest_vm}}"}
+        GCC ${{variables.gcc_latest}}: {TOOLSET: "gcc-${{variables.gcc_latest}}", PACKAGES: "g++-${{variables.gcc_latest}}-multilib", VM_IMAGE: "${{variables.linux_latest_vm}}"}
+        Clang ${{variables.clang_latest}}: {TOOLSET: "clang-${{variables.clang_latest}}", PACKAGES: "clang-${{variables.clang_latest}} libstdc++-${{variables.clang_latest_libstd++}}-dev-i386-cross", LLVM_OS: "${{variables.linux_latest_os}}", LLVM_VER: "${{variables.clang_latest}}", VM_IMAGE: "${{variables.linux_latest_vm}}"}
     pool:
       vmImage: $(VM_IMAGE)
     steps:
     - template: .ci/azp-linux-test.yml
+      parameters:
+        b2_opts: address-model=32,64
 
   - job: 'Windows_Latest'
     strategy:
@@ -108,6 +111,8 @@ stages:
     continueOnError: 'true'
     steps:
     - template: .ci/azp-windows-test.yml
+      parameters:
+        b2_opts: address-model=32,64
 
   - job: 'macOS'
     strategy:

src/tools/clang-linux.jam

@@ -30,11 +30,18 @@ toolset.inherit-generators clang-linux
     <toolset>clang <toolset-clang:platform>linux : gcc
   : gcc.mingw.link gcc.mingw.link.dll gcc.cygwin.link gcc.cygwin.link.dll ;
 
+local all-os = [ feature.values <target-os> ] ;
+local all-arch = [ feature.values <architecture> ] ;
+
 toolset.inherit-rules clang-linux : gcc ;
 toolset.inherit-flags clang-linux : gcc
   : <inlining>full
     <lto>on/<lto-mode>full
     <lto>on/<lto-mode>fat
+    <target-os>$(all-os)/<address-model>32
+    <target-os>$(all-os)/<address-model>64
+    <target-os>$(all-os)/<architecture>$(all-arch)/<address-model>32
+    <target-os>$(all-os)/<architecture>$(all-arch)/<address-model>64
   : INCLUDE-GCH
   ;
 
@@ -126,6 +133,12 @@ rule get-short-version ( command-string : single-digit-since ? )
     return $(version[1]) ;
 }
 
+local rule compile-link-flags ( * )
+{
+    toolset.flags clang-linux.compile OPTIONS $(1) : $(2) ;
+    toolset.flags clang-linux.link OPTIONS $(1) : $(2) ;
+}
+
 ###############################################################################
 # Flags
 
@@ -135,6 +148,9 @@ toolset.flags clang-linux.compile INCLUDE-PCH : -include-pch ;
 # For clang, 'on' and 'full' are identical.
 toolset.flags clang-linux.compile OPTIONS <inlining>full : -Wno-inline ;
 
+compile-link-flags <address-model>32 : -m32 ;
+compile-link-flags <address-model>64 : -m64 ;
+
 # LTO
 toolset.flags clang-linux.compile OPTIONS <lto>on/<lto-mode>thin : -flto=thin ;
 toolset.flags clang-linux.link OPTIONS <lto>on/<lto-mode>thin : -flto=thin ;

src/tools/gcc.jam

@@ -184,11 +184,12 @@ rule init ( version ? : command * : options * : requirement * )
         bin ?= [ common.get-absolute-tool-path $(command[-1]) ] ;
         root ?= $(bin:D) ;
     }
+    local machine ;
     local target-os ;
     #   Autodetect the version and flavor if not given.
     if $(command)
     {
-        local machine = [ MATCH "^([^ ]+)" :
+        machine = [ MATCH "^([^ ]+)" :
             [ SHELL "$(command-string) -dumpmachine" ] ] ;
         if ! $(version) { # ?= operator does not short-circuit
         version ?= [ get-short-version $(command-string) ] ;
@@ -203,6 +204,8 @@ rule init ( version ? : command * : options * : requirement * )
             case *mingw*  : target-os ?= windows ;
             case *cygwin* : target-os ?= cygwin ;
             case *linux*  : target-os ?= linux ;
+            case *aix*    : target-os ?= aix ;
+            case *hpux*   : target-os ?= hpux ;
             # TODO: finish this list.
         }
     }
@@ -276,6 +279,20 @@ rule init ( version ? : command * : options * : requirement * )
     toolset.flags gcc VERSION $(condition) : [ regex.split $(version) "[.]" ] ;
 
     init-cxxstd-flags $(condition) : $(version) ;
+
+    if ! $(target-os) in aix hpux
+    {
+        if [ MATCH "^(i.86|x86|powerpc|ppc|sparc)" : $(machine:L) ]
+        {
+            compile-link-flags $(condition)/<architecture>/<address-model>32 : -m32 ;
+            compile-link-flags $(condition)/<architecture>/<address-model>64 : -m64 ;
+        }
+        if [ MATCH "^(s390)" : $(machine:L) ]
+        {
+            compile-link-flags $(condition)/<architecture>/<address-model>32 : -m31 ;
+            compile-link-flags $(condition)/<architecture>/<address-model>64 : -m64 ;
+        }
+    }
 }
 
 if [ os.name ] = NT
@@ -369,6 +386,8 @@ local rule compile-link-flags ( * )
     compile-link-flags <target-os>hpux/<address-model>64 : -mlp64 ;
 
     local generic-os = [ set.difference $(all-os) : aix hpux ] ;
+    compile-link-flags <target-os>$(generic-os)/<architecture>s390x/<address-model>32 : -m31 ;
+    compile-link-flags <target-os>$(generic-os)/<architecture>s390x/<address-model>64 : -m64 ;
     local arch = power sparc x86 ;
     compile-link-flags <target-os>$(generic-os)/<architecture>$(arch)/<address-model>32 : -m32 ;
     compile-link-flags <target-os>$(generic-os)/<architecture>$(arch)/<address-model>64 : -m64 ;