GNU bug report logs - #55665
GCC fails to cross-compile

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Pavel Shlyak <p.shlyak <at> pantherx.org>
To: bug-guix <at> gnu.org
Subject: GCC fails to cross-compile
Date: Thu, 26 May 2022 20:21:19 +0300

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GCC fails to cross-compile. X86_64 host, aarch64 target.
Reproducer:
guix build gcc-toolchain --target=aarch64-linux-gnu
Log:
../../../gcc-12.1.0/libgcc/libgcc2.c: In function ‘__divsc3’:
../../../gcc-12.1.0/libgcc/libgcc2.c:1874:16: error: ‘__LIBGCC_SF_MAX__’ undeclared (first use in this function)
 1874 | # define RBIG (__LIBGCC_SF_MAX__ / 2)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2063:23: note: in expansion of macro ‘RBIG’
 2063 |       if (FABS (d) >= RBIG)
      |                       ^~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1874:16: note: each undeclared identifier is reported only once for each function it appears in
 1874 | # define RBIG (__LIBGCC_SF_MAX__ / 2)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2063:23: note: in expansion of macro ‘RBIG’
 2063 |       if (FABS (d) >= RBIG)
      |                       ^~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1876:17: error: ‘__LIBGCC_SF_EPSILON__’ undeclared (first use in this function)
 1876 | # define RMIN2 (__LIBGCC_SF_EPSILON__)
      |                 ^~~~~~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2073:22: note: in expansion of macro ‘RMIN2’
 2073 |       if (FABS (d) < RMIN2)
      |                      ^~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1875:16: error: ‘__LIBGCC_SF_MIN__’ undeclared (first use in this function)
 1875 | # define RMIN (__LIBGCC_SF_MIN__)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2082:21: note: in expansion of macro ‘RMIN’
 2082 |    if (((FABS (a) < RMIN) && (FABS (b) < RMAX2) && (FABS (d) < RMAX2))
      |                     ^~~~
make[2]: *** [Makefile:501: _divsc3.o] Error 1
../../../gcc-12.1.0/libgcc/libgcc2.c: In function ‘__divdc3’:
make[2]: *** Waiting for unfinished jobs....
../../../gcc-12.1.0/libgcc/libgcc2.c:1885:16: error: ‘__LIBGCC_DF_MAX__’ undeclared (first use in this function)
 1885 | # define RBIG (__LIBGCC_DF_MAX__ / 2)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2063:23: note: in expansion of macro ‘RBIG’
 2063 |       if (FABS (d) >= RBIG)
      |                       ^~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1885:16: note: each undeclared identifier is reported only once for each function it appears in
 1885 | # define RBIG (__LIBGCC_DF_MAX__ / 2)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2063:23: note: in expansion of macro ‘RBIG’
 2063 |       if (FABS (d) >= RBIG)
      |                       ^~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1887:17: error: ‘__LIBGCC_DF_EPSILON__’ undeclared (first use in this function)
 1887 | # define RMIN2 (__LIBGCC_DF_EPSILON__)
      |                 ^~~~~~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2073:22: note: in expansion of macro ‘RMIN2’
 2073 |       if (FABS (d) < RMIN2)
      |                      ^~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:1886:16: error: ‘__LIBGCC_DF_MIN__’ undeclared (first use in this function)
 1886 | # define RMIN (__LIBGCC_DF_MIN__)
      |                ^~~~~~~~~~~~~~~~~
../../../gcc-12.1.0/libgcc/libgcc2.c:2082:21: note: in expansion of macro ‘RMIN’
 2082 |    if (((FABS (a) < RMIN) && (FABS (b) < RMAX2) && (FABS (d) < RMAX2))
      |                     ^~~~
make[2]: *** [Makefile:501: _divdc3.o] Error 1
make[2]: Leaving directory '/tmp/guix-build-gcc-12.1.0.drv-0/build/aarch64-linux-gnu/libgcc'
make[1]: *** [Makefile:14447: all-target-libgcc] Error 2

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Message #8 received at 55665 <at> debbugs.gnu.org (full text, mbox):

From: Pavel Shlyak <p.shlyak <at> pantherx.org>
To: 55665 <at> debbugs.gnu.org
Subject: GCC fails to cross-compile
Date: Mon, 30 May 2022 13:20:46 +0300

Related?
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100341

Message #11 received at 55665 <at> debbugs.gnu.org (full text, mbox):

From: Pavel Shlyak <p.shlyak <at> pantherx.org>
To: 55665 <at> debbugs.gnu.org
Subject: GCC fails to cross-compile
Date: Thu, 11 Aug 2022 21:57:12 +0300

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It seems to be still there, even after dfda2cc5f6a57a0b89b98f389a2f28bf1e94eaa4

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Message #14 received at 55665 <at> debbugs.gnu.org (full text, mbox):

From: Josselin Poiret <dev <at> jpoiret.xyz>
To: Pavel Shlyak <p.shlyak <at> pantherx.org>, 55665 <at> debbugs.gnu.org
Subject: Re: bug#55665: GCC fails to cross-compile
Date: Fri, 10 Mar 2023 21:17:16 +0100

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Hi Pavel,

Pavel Shlyak <p.shlyak <at> pantherx.org> writes:

> It seems to be still there, even after dfda2cc5f6a57a0b89b98f389a2f28bf1e94eaa4

Now that we're working on the core-updates branch, the issue is still
there.  Roughly, libgcc relies on defines that were introduced in GCC
12, so libgcc has to be compiled with GCC 12, but we have no immediate
way of doing that since we have a GCC 11 cross-compiler that built a GCC
12 host compiler which isn't usable by the builder.

It seems like the proper (but annoying) option would instead be to build
a GCC 12 cross-compiler for the builder using the builder GCC 11, then
use that to build a host GCC 12 and libgcc.  That is at odds with how
we do cross-compilation in general though :( We'll keep poking at it.

Best,
-- 
Josselin Poiret

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