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