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Subject: commit 57a889b72 breaks cross compilation of 32bit target on 64bit
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Hello
commit 57a889b7282dab303c4cdc49cccbbe22f961bd1c:
commit 57a889b7282dab303c4cdc49cccbbe22f961bd1c
Author: Jonas Hahnfeld <hahnjo@HIDDEN>
Date: Thu Feb 22 22:09:42 2024 +0100
build: Fix cross-compilation in out-of-tree-builds
gen-scmconfig.h is generated in libguile, not $(top_builddir).
* libguile/Makefile.am: Add '-I.' when compiling gen-scmconfig.o.
Signed-off-by: Ludovic Court<C3><A8>s <ludo@HIDDEN>
was in response to the report quoted here:
https://lists.gnu.org/archive/html/bug-guile/2024-05/msg00006.html
(apologies for not replying inside the original mail thread: I was not
subscribed at the time)
But, paradoxically, for me it breaks cross compilation of 32 bit
target on a 64 bit native host.
After successful build/install of guile-3.0.10 for the native host
(64 bit), I run the cross build with:
--build=3Dx86_64-unknown-linux-gnu
--host=3Di686-unknown-linux-gnu
and get:
----8<----
make[2]: Entering directory '/home/balducci/tmp/install-us-d/guile-3.0=
.10.d/guile-3.0.10/libguile'
\
if [ "yes" =3D "yes" ]; then \
gcc -m32 -DHAVE_CONFIG_H -I.. \
-I. -c -o gen-scmconfig.o gen-scmconfig.c; \
else \
gcc -m32 -DHAVE_CONFIG_H -DBUILDING_LIBGUILE=3D1 -I.. -I.. -=
I../lib -I../lib -iquote. -I../libguile/lightening -I/home/balducci/tmp/i=
nstall-us-d/guile-3.0.10.d/guile-3.0.10 -Wall -Wmissing-prototypes -Wpoin=
ter-arith -fno-strict-aliasing -fwrapv -fvisibility=3Dhidden -I/opt/stow.d=
/versions/gc-5458/usr/include -Wno-incompatible-pointer-types -flto -c -o=
gen-scmconfig.o gen-scmconfig.c; \
fi
In file included from ../libguile/inline.h:28,
from ../libguile/gc.h:25,
from ./strings.h:25,
from /usr/include/string.h:462,
from gen-scmconfig.c:142:
../libguile/scm.h:30:10: fatal error: libguile/scmconfig.h: No such fi=
le or directory
30 | #include "libguile/scmconfig.h"
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:4478: gen-scmconfig.o] Error 1
make[2]: Leaving directory '/home/balducci/tmp/install-us-d/guile-3.0.=
10.d/guile-3.0.10/libguile'
---->8----
The reason seems to be precisely the "-I." added by the above mentioned
commit.
If I delete the "-I." directive the cross build completes successfully.
Actually, in my case, the reason why the "-I." causes the failure is the
following.
libguile/gen-scmconfig.c includes the string.h system header:
#include <string.h>
On my system (GNU/linux) the /usr/include/string.h system header (from
glibc) includes a strings.h system header (note the s in strings.h):
#include <strings.h>
It happens that in libguile, where gen-scmconfig.c is compiled, there
is also a strings.h header of the guile distribution (so totally
different from the system's /usr/include/strings.h): thus, the added
"-I." directive makes my /usr/include/string.h system header include
*guile's strings.h*, instead of my system's /usr/include/strings.h and
this causes the compile failure, due to the (wrong) chain of included
headers downstream, which ends up trying to include
libguile/scmconfig.h, which, obviously, isn't there yet, since it is
supposed to be created precisely by the gen-scmconfig executable. As I
could clarify, the wrong inclusion chain caused by the "-I." directive
is:
gen-scmconfig.c
`-- /usr/include/string.h # THIS WANTS /usr/include/strings.h
`-- ./strings.h # BUT GETS THIS ONE, INSTEAD
`-- ../libguile/gc.h
`-- ../libguile/inline.h
`-- ../libguile/scm.h
`-- ../libguile/scmconfig.h # ISN'T THERE, YET =3D> E=
RROR
According to the original post (which then triggered the above
mentioned commit) the "-I." directive was supposed to fix the
inclusion of gen-scmconfig.h, which is created in the same directory
(libguile) where gen-scmconfig.c is compiled.
BUT: gen-scmconfig.c includes gen-scmconfig.h as a *quoted*
header:
#include "gen-scmconfig.h"
and, at least with gcc, which I use for building, quoted headers are
looked for in the same directory of the file being compiled without
the need for a "-I." directive (OTOH, the "-I." directive makes the curren=
t
directory searched for headers BEFORE the system directories, and this
causes the build failure in my case, as detailed above).
Turning the "-I." into "-iquote." or "-idirafter." (instead of
deleting it) works for me and maybe might work also for the original
poster, but I don't think is portable outside gcc...
Apologies for the long mail: I hope to have clarified the problem
thanks a lot for your valuable work
ciao
-gabriele
balducci@HIDDEN:bug-guile@HIDDEN.
Full text available.bug-guile@HIDDEN:bug#71752; Package guile.
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