[CMake] fortran compiler failed to compile simple test program

[Ette, Anthony (CDS)]

> Very little.  The whole point is to test that the compiler works the way CMake will invoke it in the generated build system.

But the user does have tons of control over the generated build system so why can't he have same control have test program compilation?  I think in this case someone forcing cmake/ld to link in /usr/lib would solve the issue.  Or is it the case that user has pretty much same hooks for test program but only via command line since CMakeFiles.txt are not used (e.g. -DCMAKE_EXE_LINKER_FLAGS like you suggest below)?


 >cmake . -DCMAKE_EXE_LINKER_FLAGS="-v"
>to get more verbose output from the link step.

The command below does not turn cf77 verbose on during test program compilation...any other suggestions for this?
cmake . -DCMAKE_EXE_LINKER_FLAGS="-v" -G "Unix Makefiles"


> It shouldn't matter if /usr/lib is in your PATH.  The linker does not pay attention to PATH.  Linkers normally look in /usr/lib by default.

So the linker determines where to look for libs for test program and cmake plays no part in this?  Seems surprising given that it works outside of cmake.


> So the question is: why does this work when invoked by hand but not when CMake invokes it?

IDK this is bizarre.


> Then run that command line by hand.  You can add -v to it too.

Results are shown below.  Looks identical to the hello world.f outside of cmake so it's a mystery why -lrt can't be found.  Presumably the linker is not looking in /usr/lib when invoked by cmake, no?

rts1-4:/home/bzpl46/test2/CMakeFiles/CMakeTmp> /usr/ccs/bin/cf77 CMakeFiles/cmTryCompileExec3453195864.dir/testFortranCompiler.f.o -o cmTryCompileExec3453195864 -rdynamic
/usr/ccs/release/7.3/lib_ia32/ld: cannot find -lrt
rts1-4:/home/bzpl46/test2/CMakeFiles/CMakeTmp> /usr/ccs/bin/cf77 -v CMakeFiles/cmTryCompileExec3453195864.dir/testFortranCompiler.f.o -o cmTryCompileExec3453195864 -rdynamic
environment: PDE_RELEASE = 7.3
environment: PDE_LINUX_RELEASE = i386-redhat-linux
environment: PDE_GCC_VERSION = 4.1.2
environment: PDE_CPU = pentium4
Linking executable: /usr/ccs/release/7.3/lib_ia32/ld -t -melf_i386 -u MAIN__ -dynamic-linker /lib/ld-linux.so.2 --allow-multiple-definition /usr/lib/crt1.o /usr/lib/crti.o /usr/lib/gcc/i386-redhat-linux/4.1.2/crtbeginT.o -v CMakeFiles/cmTryCompileExec3453195864.dir/testFortranCompiler.f.o -r -L/usr/ccs/release/7.3/lib_ia32 -L/usr/lib/gcc/i386-redhat-linux/4.1.2 -lhU77 -lhF77 -lhI77 -lrt -lm -lgcc -lgcc_eh -lc -lgcc -lgcc_eh -o cmTryCompileExec3453195864 /usr/lib/gcc/i386-redhat-linux/4.1.2/crtend.o /usr/lib/crtn.o
GNU ld version 2.17.50.0.6-5.el5 20061020
/usr/ccs/release/7.3/lib_ia32/ld: mode elf_i386
/usr/lib/crt1.o
/usr/lib/crti.o
/usr/lib/gcc/i386-redhat-linux/4.1.2/crtbeginT.o
CMakeFiles/cmTryCompileExec3453195864.dir/testFortranCompiler.f.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)main.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)main2.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)no_lg.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)xarg.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)fperoundset.o
(/usr/ccs/release/7.3/lib_ia32/libhF77.a)fpetrapset.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)close.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)err.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)f_errlist.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)hf77_io.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)lwrite.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)open.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)util.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)wrtfmt.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)dofio.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)dolio.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)douio.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)fmt.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)fmtlib.o
(/usr/ccs/release/7.3/lib_ia32/libhI77.a)sue.o
/usr/ccs/release/7.3/lib_ia32/ld: cannot find -lrt

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