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# This example shows performing configure checks in B2,
# e.g. to check for some system function or compiler quirk.
# First, declare a metatarget that we'll try to build.
obj foo : foo.cpp ;
# Make it explicit so that it's only built if used by a configure check
explicit foo ;
# Declare a target that depends on configure check result.
exe main
: main.cpp
# The check-target-builds invocation in requirements section will
# - build the specified metatarget
# - if it builds OK, add the properties in the second parameter
# - otherwise, add the properties in the third parameter
: [ check-target-builds foo : <define>FOO=1 : <define>FOO=0 ]
;
# To test this:
#
# 1. Build with "b2". You should see a "foo builds: yes" message, and running
# the produced executable will show that FOO is set to 1.
# 2. Modify foo.cpp to contain a compile error, rebuild with
# "b2 -a --reconfigure". You should see a "foo builds: no" message, and running
# the produced executable should show that FOO is now set to 0.
#
# The output from the check is not shown on the console, instead it is
# redirected to the bin/config.log file
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