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Hello,
I copy bash-5.2.21 source to build it on debian hurd x86_64 and it failed with
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gcc -L./builtins -L./lib/readline -L./lib/readline -L./lib/glob -L./lib/tilde -L./lib/malloc -L./lib/sh -L./lib/termcap -g -O2 -o bash shell.o eval.o y.tab.o general.o make_cmd.o print_cmd.o dispose_cmd.o execute_cmd.o variables.o copy_cmd.o error.o expr.o flags.o jobs.o subst.o hashcmd.o hashlib.o mailcheck.o trap.o input.o unwind_prot.o pathexp.o sig.o test.o version.o alias.o array.o arrayfunc.o assoc.o braces.o bracecomp.o bashhist.o bashline.o list.o stringlib.o locale.o findcmd.o redir.o pcomplete.o pcomplib.o syntax.o xmalloc.o -lbuiltins -lglob -lsh -lreadline -lhistory ./lib/termcap/libtermcap.a -ltilde -lmalloc -ldl
/usr/bin/ld: ./lib/termcap/libtermcap.a(termcap.o):/home/gfleury/bash-5.2.21/build/lib/termcap/../../../lib/termcap/termcap.c:298: multiple definition of `PC'; ./lib/readline/libreadline.a(terminal.o):/home/gfleury/bash-5.2.21/build/lib/readline/../../../lib/readline/terminal.c:109: first defined here
/usr/bin/ld: ./lib/termcap/libtermcap.a(tparam.o):/home/gfleury/bash-5.2.21/build/lib/termcap/../../../lib/termcap/tparam.c:126: multiple definition of `BC'; ./lib/readline/libreadline.a(terminal.o):/home/gfleury/bash-5.2.21/build/lib/readline/../../../lib/readline/terminal.c:109: first defined here
/usr/bin/ld: ./lib/termcap/libtermcap.a(tparam.o):/home/gfleury/bash-5.2.21/build/lib/termcap/../../../lib/termcap/tparam.c:127: multiple definition of `UP'; ./lib/readline/libreadline.a(terminal.o):/home/gfleury/bash-5.2.21/build/lib/readline/../../../lib/readline/terminal.c:109: first defined here
/usr/bin/ld: ./lib/sh/libsh.a(tmpfile.o): in function `sh_mktmpname':
/home/gfleury/bash-5.2.21/build/lib/sh/../../../lib/sh/tmpfile.c:160:(.text+0x17f): warning: the use of `mktemp' is dangerous, better use `mkstemp' or `mkdtemp'
collect2: error: ld returned 1 exit status
make: *** [Makefile:595: bash] Error 1
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with this small patch i managed to build it and seems to get rid of some weird character before prompt '?2004lroot@hurd:~#'
--- lib/readline/terminal.c 2024-01-05 09:36:25.394494448 +0200
+++ lib/readline/terminal.c 2024-01-05 09:36:57.022494473 +0200
@@ -102,7 +102,7 @@
static int tcap_initialized;
-#if !defined (__linux__) && !defined (NCURSES_VERSION)
+#if !defined (__linux__) && !defined (__GNU__) && !defined (NCURSES_VERSION)
# if defined (__EMX__) || defined (NEED_EXTERN_PC)
extern
# endif /* __EMX__ || NEED_EXTERN_PC */
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