[CMake] 3.1 can't link my MinGW executables any more.

[Bill Somerville]

Hi,

I have just tried 3.1.0-rc2 and my executable links are failing because 
all the link libraries are not being added.

I use:

add_executable (jt65code lib/jt65code.f90 wsjtx.rc)
target_link_libraries (jt65code wsjt)

where wsjt is a static library target with Fortran and C functions. This 
normally gives a link edit step of:

C:\Tools\Qt\Tools\mingw48_32\bin\g++.exe   -Wall -Wextra -std=c++11 
-fexceptions -frtti -pthread -g    -Wl,--whole-archive 
CMakeFiles\jt65code.dir/objects.a -Wl,--no-whole-archive  -o 
jt65code.exe -Wl,--out-implib,libjt65code.dll.a 
-Wl,--major-image-version,0,--minor-image-version,0  libwsjt.a 
-lgfortran -lquadmath -lm -lkernel32 -luser32 -lgdi32 -lwinspool 
-lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32

but in 3.1.0-rc2 I get:

C:\Tools\Qt\Tools\mingw48_32\bin\ar.exe cr 
CMakeFiles\jt65code.dir/objects.a @CMakeFiles\jt65code.dir\objects1.rsp
C:\Tools\Qt\Tools\mingw48_32\bin\g++.exe   -Wall -Wextra -std=c++11 
-fexceptions -frtti -pthread -g   -Wl,--whole-archive 
CMakeFiles\jt65code.dir/objects.a -Wl,--no-whole-archive  -o 
jt65code.exe -Wl,--out-implib,libjt65code.dll.a 
-Wl,--major-image-version,0,--minor-image-version,0 
@CMakeFiles\jt65code.dir\linklibs.rsp

So it looks like the linklibs.rsp  response file doesn't have the 
required entries.

Looking at the build tree I find a linklibs.rsp in the top level 
directory (CMakeFIles/jt65code.dir) with the correct entries but the 
link edit command is passing a file in the subordinate 'lib' directory 
that doesn't exist. Something wrong with the use of a source in a 
subdirectory perhaps?

Regards
Bill Somerville.