On 09/21/2015 10:24 AM, thoni56 wrote:
Aahh, I was looking at the trace and it only included "include":s so I
thought that offending IF was in cmake's own files since it pointed there.
But, you are saying that probably the culprit is a variable set before the
first include, right? (It was definitely not by intention a variable was as
having the empty name ;-).
The culprit is the empty named variable being set before the condition
in that included module is evaluated, yes.
If you aren't the one setting it it might also be accidentally set
somewhere in cmake code of course.
It probably isn't something as obvious as set("" foobar) but perhaps
something like e.g. set("${MY_VAR_NAME}" foobar) (where MY_VAR_NAME is
an unset variable e.g. due to typo or unexpected program logic).
And if I look at
/usr/share/cmake-3.3.1/Modules/CMakeParseImplicitLinkInfo.cmake:58 I should
probably see the variable (or one that expands to include it)?
The condition in that line is:
if("${cmd}" MATCHES "${linker_regex}")
So apparently ${cmd} expands empty (which may or may not be expected but
is a distinct issue).
With old behavior cmake will therefor look for a variable with the empty
name and in your case finds and expands it.
If you don't know where the empty named variable might come from I would
expect cmake's new --trace-expand might be helpful.
I haven't tried it myself yet and you would have to use a nightly build
though since it hasn't made it into a release yet.
Nils
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