From b3ffed4ec2cdb376e9355a17d5e89ec2f3bc893a Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Tue, 19 Oct 2021 00:13:29 +0300
Subject: [PATCH] Disable building boost_log_setup when settings parsers are
 disabled.

Check the BOOST_LOG_WITHOUT_SETTINGS_PARSERS macro in the Jamfile and
suppress building boost_log_setup if it is defined. The built library
is empty in this case, and MSVC linker even produces no library,
which later breaks installation.

Fixes https://github.com/boostorg/log/issues/164.
Closes https://github.com/boostorg/log/pull/165.
Blocked by https://github.com/bfgroup/b2/issues/104.
---
 build/Jamfile.v2 | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/build/Jamfile.v2 b/build/Jamfile.v2
index a81fb8b27..46dd04596 100644
--- a/build/Jamfile.v2
+++ b/build/Jamfile.v2
@@ -418,10 +418,23 @@ local BOOST_LOG_SETUP_COMMON_SRC =
     default_formatter_factory.cpp
     ;
 
+rule check-boost_log_setup-enabled ( properties * )
+{
+    local result ;
+
+    if [ has-config-flag BOOST_LOG_WITHOUT_SETTINGS_PARSERS : $(properties) ]
+    {
+        result = <build>no ;
+    }
+
+    return $(result) ;
+}
+
 lib boost_log_setup
     : ## sources ##
         setup/$(BOOST_LOG_SETUP_COMMON_SRC)
     : ## requirements ##
+        <conditional>@check-boost_log_setup-enabled
         <link>shared:<define>BOOST_LOG_DYN_LINK=1
         <link>shared:<define>BOOST_LOG_SETUP_DLL
         <define>BOOST_LOG_SETUP_BUILDING_THE_LIB=1