Hello, Liliana Marie Prikler writes: > Am Dienstag, dem 09.08.2022 um 15:32 -0700 schrieb Gang Liang: >> I had a fresh installation of cling from guix, and got the following >> error. Seems some system headers are missing. > You probably need gcc-toolchain installed alongside cling. Indeed: $ guix shell --pure cling -- cling '#include ' In file included from input_line_3:1: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/iostream:39: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/ostream:38: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/ios:42: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/bits/ios_base.h:41: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/bits/locale_classes.h:40: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/string:55: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/bits/basic_string.h:6545: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/ext/string_conversions.h:44: In file included from /gnu/store/069aq2v993kpc41yabp5b6vm4wb9jkhg-gcc-10.3.0/include/c++/cerrno:42: In file included from /gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33/include/errno.h:28: /gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33/include/bits/errno.h:26:11: fatal error: 'linux/errno.h' file not found # include ^~~~~~~~~~~~~~~ But: $ guix shell --pure cling gcc-toolchain -- cling '#include ' runs fine. I tried this: --8<---------------cut here---------------start------------->8--- modified gnu/packages/llvm.scm @@ -79,6 +79,12 @@ (define-module (gnu packages llvm) #:export (make-lld-wrapper system->llvm-target)) +;;; Lazily resolve to avoid top-level cycles between modules. +(define gcc-toolchain* + (delay (module-ref (resolve-interface '(gnu packages commencement)) + 'gcc-toolchain))) + + (define* (system->llvm-target #:optional (system (or (and=> (%current-target-system) gnu-triplet->nix-system) @@ -2215,11 +2221,25 @@ (define-public cling (add-after 'install 'delete-static-libraries ;; This reduces the size from 17 MiB to 5.4 MiB. (lambda _ - (for-each delete-file (find-files #$output "\\.a$"))))))) + (for-each delete-file (find-files #$output "\\.a$")))) + (add-after 'install 'wrap-cling + ;; Wrap the 'cling' command so that it can locate the GCC + ;; toolchain provided headers. Use 'suffix so as to allow users + ;; to override which headers are used. + (lambda* (#:key outputs #:allow-other-keys) + (define gcc-toolchain #$(this-package-input "gcc-toolchain")) + (wrap-program (search-input-file outputs "bin/cling") + `("C_INCLUDE_PATH" suffix + (,(string-append gcc-toolchain "/include"))) + `("CPLUS_INCLUDE_PATH" suffix + (,(string-append gcc-toolchain "/include/c++") + ,(string-append gcc-toolchain "/include"))) + `("LIBRARY_PATH" suffix + (,(string-append gcc-toolchain "/lib"))))))))) (native-inputs (list python python-lit)) (inputs - (list clang-cling llvm-cling)) + (list clang-cling (force gcc-toolchain*) llvm-cling)) (home-page "https://root.cern/cling/") (synopsis "Interactive C++ interpreter") (description "Cling is an interactive C++17 standard compliant --8<---------------cut here---------------end--------------->8--- but it gave: --8<---------------cut here---------------start------------->8--- /gnu/store/lpwfmh4v2w2qbpdmmva0si32c9havn95-llvm-cling-9.0.1/lib/libLLVM-9.so(_ZN4llvm3sys15PrintStackTraceERNS_11raw_ostreamE+0x1a)[0x7f76e20ea81a] /gnu/store/lpwfmh4v2w2qbpdmmva0si32c9havn95-llvm-cling-9.0.1/lib/libLLVM-9.so(_ZN4llvm3sys17RunSignalHandlersEv+0x34)[0x7f76e20e8894] /gnu/store/lpwfmh4v2w2qbpdmmva0si32c9havn95-llvm-cling-9.0.1/lib/libLLVM-9.so(+0x7129c2)[0x7f76e20e89c2] /gnu/store/5h2w4qi9hk1qzzgi1w83220ydslinr4s-glibc-2.33/lib/libpthread.so.0(+0x11d80)[0x7f76e6c3fd80] /gnu/store/094bbaq6glba86h1d4cj16xhdi6fk2jl-gcc-10.3.0-lib/lib/libstdc++.so.6(_ZTVN10__cxxabiv120__si_class_type_infoE+0x10)[0x7f76e19c0c78] Stack dump: 0. Program arguments: /gnu/store/x48h88ckmkk5vh9g36d2cnmhw23x9ql5-profile/bin/cling #include --8<---------------cut here---------------end--------------->8--- I'm not sure why. Should we close it as 'notabug', or persist with the attempt to wrap the cling binary with the include paths required to ease its setup? Thanks, Maxim