Re: [gentoo-user] Make failed to compile: symbol __alloca not found...

Hi,


On 12/11 09:07, David Haller wrote:
> Hello,
>
> On Mon, 11 Dec 2017, tuxic@××××××.de wrote:
> >On 12/11 05:13, David Haller wrote:
> >> Hello,
> >>
> >> On Sun, 10 Dec 2017, tuxic@××××××.de wrote:
> >> >x86_64-pc-linux-gnu-gcc -DLOCALEDIR=\"/usr/share/locale\" -DLIBDIR=\"/usr/lib64\" -DINCLUDEDIR=\"/usr/include\" -DHAVE_CONFIG_H -I.  -I./glob    -march=native -O2 -pipe -c -o remote-stub.o remote-stub.c
> >> >x86_64-pc-linux-gnu-gcc  -march=native -O2 -pipe -Wl,--export-dynamic -Wl,-O1 -Wl,--as-needed -o make ar.o arscan.o commands.o default.o dir.o expand.o file.o function.o getopt.o getopt1.o guile.o implicit.o job.o load.o loadapi.o main.o misc.o posixos.o output.o read.o remake.o rule.o signame.o strcache.o variable.o version.o vpath.o hash.o remote-stub.o glob/libglob.a   -ldl
> >> >glob/libglob.a(glob.o): In function `glob_in_dir':
> >> >glob.c:(.text+0x2ed): undefined reference to `__alloca'
> >>
> >> IIRC, that's a missing #define somewhere. Or a #define where it
> >> shouldn't. But the thing is: on my system, make doesn't build libglob
> >> at all because it finds the globbing stuff in glibc. And make has its
> >> own alloca.c.
> >>
> >> So, please show the output of the configure-part of the ebuild and
> >> what's the output of:
> >>
> >> $ grep _GNU_GLOB_INTERFACE_VERSION /usr/include/gnu-versions.h
> >
> >Here it comes:
> [..]
> >./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-dependency-tracking --disable-silent-rules --libdir=/usr/lib64 --program-prefix=g --without-guile --enable-nls
> >configure: loading site script /usr/share/config.site
> [..]
> >checking if system libc has GNU glob... no
> [..]
>
> That figures.
>
> >/root>grep _GNU_GLOB_INTERFACE_VERSION /usr/include/gnu-versions.h
> >#define _GNU_GLOB_INTERFACE_VERSION	2 /* vs posix/glob.c */
>
> You seem to be using glibc-2.26. Question is, is that new
> GLOB_INTERFACE backwards compatible or not? If it is, you could just
> mangle the configure, so that "GNU glob" is considered found, a patch
> via the e{apply,patch}_user of configure{ac,} should work.
>
> >Any ideas?
>
> "downgrade" to the stable glibc-2.25 ... ;)


emerge prevets this, saying any downgrade would cripple my system...


Cheers
Meino





>
> Or dig into why the following happens, i.e. why is __alloca not
> defined in glob_in_dir() ...
>
> >> Ah, yess:
> >>
> >> ==== make-4.2.1/glob/glob.c:211 ff. ====
> >> #if !defined __alloca && !defined __GNU_LIBRARY__
> >> [..]
> >> #  define alloca(n)     __builtin_alloca (n)
> >> [..]
> >> # define __alloca       alloca
> >> [.. down to line 1217 ..]
> >> static int
> >> glob_in_dir( ..
> >> [..]
> >> char *fullname = (char *) __alloca(...             /* line 1256 */
> >> ====
> >>
> >> Somewhere between that and line 1256 of glob.c, where __alloca is
> >> first used in that function you managed to undef __alloca...
> >>
> >> You must have done something weird ...
>
> If I have the time, I'll try merging the glibc-2.26 and see what
> happens. Usually, debugging preprocessor stuff involves (for me) a lot
> of liberally sprinkling of in this case e.g.
>
> #ifndef __alloca
> #warning notdef __alloca
> #endif
>
> or somesuch throughout the relevant code, occasionally verified against the
> preprocessed code (gcc -save-temps is nice ;) But it tends to be
> tedious if you don't know the code (and circumstances) well already.
>
> HTH,
> -dnh
>
> PS: I've not synced portage for quite some days, I wanted to get done
>     with the 'emerge -e @world' before adding updates and whatnot into
>     the mess... So dunno if glibc-2.26 is stable already.
>
> --
> The problem with people whose minds are in the gutter is that they keep
> blocking my periscope.                                  [Peter Gutman]
>