Config checks using `address-model=32` in Linux don't use the right flags

[anarthal]

Make sure you completed the following tasks

• [x] I searched the discussions
• [x] I searched the closed and open issues
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Environment and version details

• Operating System+version: Linux Ubuntu 22.04 - as per the Docker container ghcr.io/anarthal-containers/build-clang16-i386
• Compiler+version: clang-16 (also happens with the system's default gcc)
• Shell: bash
• B2 Version: Output of b2 -v and b2 --version: B2 5.1.0 (OS=LINUX, jobs=8)

• B2 Configuration: Output of b2 --debug-configuration in your project.

  root@ce785db6e1f3:~/boost-root# ./b2 --debug-configuration libs/mysql/test//fail_if_no_openssl
  notice: found boost-build.jam at /root/boost-root/boost-build.jam
  notice: loading B2 from /root/boost-root/tools/build/src/build-system.jam
  notice: Searching '/etc' '/root' '/root/boost-root/tools/build/src/util' '/root/boost-root/tools/build/src/tools' '/root/boost-root/tools/build/src/options' '/root/boost-root/tools/build/src/engine' '/root/boost-root/tools/build/src/contrib' '/root/boost-root/tools/build/src/build' '/root/boost-root/tools/build/src' for site-config configuration file 'site-config.jam'.
  notice: Configuration file 'site-config.jam' not found in '/etc' '/root' '/root/boost-root/tools/build/src/util' '/root/boost-root/tools/build/src/tools' '/root/boost-root/tools/build/src/options' '/root/boost-root/tools/build/src/engine' '/root/boost-root/tools/build/src/contrib' '/root/boost-root/tools/build/src/build' '/root/boost-root/tools/build/src'.
  notice: Searching '/root' '/root/boost-root/tools/build/src/util' '/root/boost-root/tools/build/src/tools' '/root/boost-root/tools/build/src/options' '/root/boost-root/tools/build/src/engine' '/root/boost-root/tools/build/src/contrib' '/root/boost-root/tools/build/src/build' '/root/boost-root/tools/build/src' for user-config configuration file 'user-config.jam'.
  notice: Configuration file 'user-config.jam' not found in '/root' '/root/boost-root/tools/build/src/util' '/root/boost-root/tools/build/src/tools' '/root/boost-root/tools/build/src/options' '/root/boost-root/tools/build/src/engine' '/root/boost-root/tools/build/src/contrib' '/root/boost-root/tools/build/src/build' '/root/boost-root/tools/build/src'.
  notice: Searching '.' for project-config configuration file 'project-config.jam'.
  notice: Loading project-config configuration file 'project-config.jam' from '.'.
  notice: will use 'clang++' for clang-linux, condition <toolset>clang-linux-16
  warning: toolset clang-linux initialization: can not find tool windres
  warning: initialized from project-config.jam:12
  notice: using rc compiler :: <toolset>clang-linux-16 :: as
  notice: [python-cfg] Configuring python...
  notice: [python-cfg]   user-specified version: "3.11"
  notice: [python-cfg]   user-specified cmd-or-prefix: "/usr"
  notice: [python-cfg] Checking interpreter command "/usr/bin/python3.11"...
  notice: [python-cfg] running command '/usr/bin/python3.11 -c "from sys import *; print('version=%d.%d\nplatform=%s\nprefix=%s\nexec_prefix=%s\nexecutable=%s' % (version_info[0],version_info[1],platform,prefix,exec_prefix,executable))" 2>&1'
  notice: [python-cfg] ...requested configuration matched!
  notice: [python-cfg] Details of this Python configuration:
  notice: [python-cfg]   interpreter command: "/usr/bin/python3.11"
  notice: [python-cfg]   include path: "/usr/include/python3.11"
  notice: [python-cfg]   library path: "/usr/lib/python3.11/config" "/usr/lib"
  notice: [python-cfg] Checking for NumPy...
  notice: [python-cfg] running command '/usr/bin/python3.11 -c "import sys; sys.stderr = sys.stdout; import numpy; print(numpy.get_include())"'
  notice: [python-cfg] NumPy disabled. Reason:
  notice: [python-cfg]   /usr/bin/python3.11 -c "import sys; sys.stderr = sys.stdout; import numpy; print(numpy.get_include())" aborted with 
  notice: [python-cfg]   Traceback (most recent call last):
  File "<string>", line 1, in <module>
  ModuleNotFoundError: No module named 'numpy'
  notice: [openssl] Using pre-installed library
  notice: [openssl] Condition
  Performing configuration checks
  
  - ssl                      : no
  OpenSSL could not be found. Don't build target fail_if_no_openssl to skip this check

Please note: fail_if_no_openssl is a Boost.MySQL target that is not yet in the development branch.

Brief problem description

When building in Linux specifying address-model=32 in the command line, configuration checks seem to ignore the setting, which causes libraries to appear as not found.

Steps to reproduce the issue

1. Create a repro/Jamfile file in the Boost root with the following, to force a config check on the OpenSSL library:

import ac ;
using openssl ;

alias test : requirements [ ac.check-library /openssl//ssl : : <build>no ] ;

2. Run b2

root@ce785db6e1f3:~/boost-root# ./b2 address-model=32 toolset=clang repro
Performing configuration checks

    - ssl                      : no
...found 1 target...

3. The output of config.log seems to imply that configuration checks are being run without the -m32 flag, which is causing the test executables to not build. Here's the log:

root@ce785db6e1f3:~/boost-root# cat bin.v2/config.log 
...found 14 targets...
...updating 12 targets...
clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/openssl/ssl_h.o
In file included from bin.v2/standalone/ac/openssl/ssl_h.cpp:1:
In file included from /usr/include/openssl/ssl.h:21:
/usr/include/openssl/macros.h:14:10: fatal error: 'openssl/opensslconf.h' file not found
#include <openssl/opensslconf.h>
         ^~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

    "clang++"   -fvisibility-inlines-hidden -fPIC -pthread -O0 -fno-inline -Wall -g -fvisibility=hidden       -c -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/openssl/ssl_h.o" "bin.v2/standalone/ac/openssl/ssl_h.cpp"

...failed clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/openssl/ssl_h.o...

...updated 11 targets...

...failed updating 1 target...
   clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/openssl/ssl_h.o
...found 5 targets...
...updating 3 targets...
clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/main-ssl.o
clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssl
/usr/bin/ld: cannot find -lssl: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

    "clang++"    -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssl" -Wl,--start-group "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/main-ssl.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -lssl -Wl,--end-group -fPIC -pthread -g -fvisibility=hidden -fvisibility-inlines-hidden 

...failed clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssl...

...updated 2 targets...

...failed updating 1 target...
   clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssl
...found 5 targets...
...updating 3 targets...
clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/main-ssleay32.o
clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssleay32
/usr/bin/ld: cannot find -lssleay32: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

    "clang++"    -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssleay32" -Wl,--start-group "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/main-ssleay32.o"  -Wl,-Bstatic  -Wl,-Bdynamic -lrt -lssleay32 -Wl,--end-group -fPIC -pthread -g -fvisibility=hidden -fvisibility-inlines-hidden 

...failed clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssleay32...

...updated 2 targets...

...failed updating 1 target...
   clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/ssleay32
...found 5 targets...
...updating 5 targets...
clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/main-ssl.o
clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssl
/usr/bin/ld: cannot find -lssl: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

    "clang++"    -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssl" -Wl,--start-group "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/main-ssl.o"  -Wl,-Bstatic -lssl -Wl,-Bdynamic -lrt -Wl,--end-group -pthread -g -fvisibility=hidden -fvisibility-inlines-hidden 

...failed clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssl...

...updated 4 targets...

...failed updating 1 target...
   clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssl
...found 2 targets...
...updating 2 targets...
clang-linux.compile.c++ bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/main-ssleay32.o
clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssleay32
/usr/bin/ld: cannot find -lssleay32: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

    "clang++"    -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssleay32" -Wl,--start-group "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/main-ssleay32.o"  -Wl,-Bstatic -lssleay32 -Wl,-Bdynamic -lrt -Wl,--end-group -pthread -g -fvisibility=hidden -fvisibility-inlines-hidden 

...failed clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssleay32...

...updated 1 target...

...failed updating 1 target...
   clang-linux.link bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/link-static/threading-multi/visibility-hidden/ssleay32
...found 1 target...
...updating 1 target...
config-cache.write bin.v2/project-cache.jam

...updated 1 target...

Running the check "clang++" -fvisibility-inlines-hidden -fPIC -pthread -O0 -fno-inline -Wall -g -fvisibility=hidden -c -o "bin.v2/standalone/ac/clang-linux-16/debug/address-model-32/threading-multi/visibility-hidden/openssl/ssl_h.o" "bin.v2/standalone/ac/openssl/ssl_h.cpp" adding the -m32 flag succeeds.

4. Note that libssl-dev:i386 is installed on the machine, but not libssl-dev:i686.
5. Running ./b2 address-model=32 toolset=clang architecture=x86 repro succeeds.

Actual behavior summary

Expected behavior summary

We shouldn't need to specify architecture=x86 for config checks to succeed, since we don't need it for the code to build.

[grisumbras]

The problem is with deduction rules in https://github.com/boostorg/boost, the issue should be moved there.

[pdimov]

I merged the linked PR.