package/tcl: add mandatory dependency to zlib
Tcl changed its zlib handling in upstream commit [1]. Before this
commit, the HAVE_ZLIB macro was defined only if a zlib headers/library
was found. After that commit, the HAVE_ZLIB macro is unconditionally
defined. The only change is that: if a working zlib library is found
in the toolchain sysroot, it is used. Otherwise, the package will use
a shipped version in [2]. See also [3] and [4].
This tcl commit is included in Buildroot since commit 7fda943b43
"tcl: bump to version 8.6.1".
In Buildroot, we prefer to not use bundled libraries wherever possible,
so add an unconditional dependency to zlib.
Further notes:
This behavior leads to runtime failures, when the package is compiled
with toolchains including zlib in their sysroot. This is because at
configuration time, the package will detect zlib in the sysroot and
link against it, but the library files won't be installed on target.
This happen to be the case with Bootlin toolchains such as [5], as they
also contaions gdbserver, and since 3341ceb1e585 (package/gdb: zlib is
mandatory, not optional), we also build zlib even if only gdbserver is
built (gdbserver does not use zlib, so that's a bug in our gdb
packaging).
This toolchain also happen to be the one used in basic configurations
of the runtime test infrastructure (this issue was found while
attempting to write a runtime test for tcl).
In such cases, running "tclsh" command fails with error message:
tclsh: error while loading shared libraries: libz.so.1: cannot open shared object file: No such file or directory
libtcl library also miss its dependency.
ldd /usr/lib/libtcl8.6.so
libz.so.1 => not found
libm.so.6 => /lib/libm.so.6 (0xb6dad000)
libc.so.6 => /lib/libc.so.6 (0xb6c65000)
/lib/ld-linux.so.3 (0xb6f6c000)
[1] https://github.com/tcltk/tcl/commit/6f3dea45cee94f12ffa0b2acbbdb3eedbc01807b
[2] https://github.com/tcltk/tcl/tree/core-8-6-13/compat/zlib
[3] https://github.com/tcltk/tcl/blob/core-8-6-13/unix/configure.in#L172
[4] https://github.com/tcltk/tcl/blob/core-8-6-13/unix/Makefile.in#L240
[5] https://toolchains.bootlin.com/downloads/releases/toolchains/armv5-eabi/tarballs/armv5-eabi--glibc--stable-2023.08-1.tar.bz2
Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 7af8dee3a8a0559c2685237ec24f817f37669efc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Julien Olivain