Re: [Chicken-users] Duplicate symbol errors with functors and -static flag
On Nov 20, 2018, at 6:59 PM, Evan Hanson wrote: > > Hi Antoine, > > The issue here is the "./" prefix on $(SCHEME_OBJECTS). Your project > works fine with just the following change: > >3c3 >< SOURCE_PREFIX = ./ >--- > SOURCE_PREFIX = > > CHICKEN uses a naive string comparison to deduplicate object files, so "./a.o" > and "a.o" are considered to be distinct. The first of these files you provide > explicitly in the Make rule for "test" (which is fine), while the second of > them comes from CHICKEN's dependency resolution (as a prerequisite of the > functor instantiation, b-foo). Because the two differ as strings, they are not > deduplicated, both are passed to clang, and you get a linking error. > > We may want to improve on this in the future by normalising filenames or > comparing them as paths, but for right now that is the cause and what you can > do to solve it. > > All the best, > > Evan > > P.S. Thank you for the very high-quality reproduction. Thanks for the fast and exhaustive answer. Your fix works for me. I can easily rearrange my workflow and stop relying on this SOURCE_PREFIX variable. Best, Antoine ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
[Chicken-users] Duplicate symbol errors with functors and -static flag
Hello, I came across weird duplicate symbol errors while using functors and the -static flag in CHICKEN 5. You can find the full repro here in case my explanation is not clear: https://github.com/antoine1fr/chicken-functor-static-error. Given: * a unit 'a', * a unit 'make-b' that defines a functor 'make-b' and uses 'a', * a unit 'b-foo' that creates the module 'b-foo' from 'make-b'. The following link command: $ csc -v -static -o test ./a.o ./make-b.o ./b-foo.o ./test.o generates the following call to the C compiler: 'clang' 'test.o' 'b-foo.o' 'make-b.o' 'a.o' 'a.o' -o 'test' -m64 -L/usr/local/Cellar/chicken/5.0.0/lib /usr/local/Cellar/chicken/5.0.0/lib/libchicken.a -lm The problem is that 'a.o' is issued twice to clang. This results in duplicate symbol errors. Here are the full build logs: $ make csc -J -static -o a.o -c a.scm csc -J -static -o make-b.o -c make-b.scm csc -J -static -o b-foo.o -c b-foo.scm csc -J -static -o test.o -c test.scm csc -v -static -o test ./a.o ./make-b.o ./b-foo.o ./test.o 'clang' 'test.o' 'b-foo.o' 'make-b.o' 'a.o' 'a.o' -o 'test' -m64 -L/usr/local/Cellar/chicken/5.0.0/lib /usr/local/Cellar/chicken/5.0.0/lib/libchicken.a -lm duplicate symbol _C_a_toplevel in: a.o ld: 1 duplicate symbol for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Error: shell command terminated with non-zero exit status 256: 'clang' 'test.o' 'b-foo.o' 'make-b.o' 'a.o' 'a.o' -o 'test' -m64 -L/usr/local/Cellar/chicken/5.0.0/lib /usr/local/Cellar/chicken/5.0.0/lib/libchicken.a -lm make: *** [test] Error 1 Can someone tell me what I'm doing wrong? Best, Antoine ___ Chicken-users mailing list Chicken-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/chicken-users
