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Hmm yeah, didn't notice that because I always use my gcc-snapshot. I will fix it.

I am getting conflicts with gcc 14.2.1 with this package:

(1/1) checking for file conflicts                                           [###########################################] 100%
error: failed to commit transaction (conflicting files)
arm-linux-gnueabihf-gcc: /usr/share/gcc-14.2.1/python/libstdcxx/__init__.py exists in filesystem (owned by gcc)
arm-linux-gnueabihf-gcc: /usr/share/gcc-14.2.1/python/libstdcxx/v6/__init__.py exists in filesystem (owned by gcc)
arm-linux-gnueabihf-gcc: /usr/share/gcc-14.2.1/python/libstdcxx/v6/printers.py exists in filesystem (owned by gcc)
arm-linux-gnueabihf-gcc: /usr/share/gcc-14.2.1/python/libstdcxx/v6/xmethods.py exists in filesystem (owned by gcc)

I've rebuild it from scratch (with stage1/stage2 included) and the issue has gone, thanks wgottwalt!

Did you really built your complete toolchain from scratch? I did so minutes ago:

# l /usr/bin/arm-linux-gnueabihf-*
-rwxr-xr-x 1 root root  1111368 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-addr2line*
-rwxr-xr-x 2 root root  1143920 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-ar*
-rwxr-xr-x 2 root root  2115768 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-as*
-rwxr-xr-x 2 root root  1555056 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-c++*
-rwxr-xr-x 1 root root  1106760 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-c++filt*
-rwxr-xr-x 1 root root  1555136 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-cpp*
-rwxr-xr-x 1 root root  3033408 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-dwp*
-rwxr-xr-x 2 root root  1555056 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-g++*
-rwxr-xr-x 2 root root  1555168 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcc*
-rwxr-xr-x 2 root root  1555168 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcc-14.2.0*
-rwxr-xr-x 1 root root    31672 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcc-ar*
-rwxr-xr-x 1 root root    31672 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcc-nm*
-rwxr-xr-x 1 root root    31672 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcc-ranlib*
-rwxr-xr-x 1 root root   693352 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcov*
-rwxr-xr-x 1 root root   568280 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcov-dump*
-rwxr-xr-x 1 root root   606016 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gcov-tool*
-rwxr-xr-x 1 root root  1565216 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-gm2*
-rwxr-xr-x 4 root root  2210136 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-ld*
-rwxr-xr-x 4 root root  2210136 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-ld.bfd*
-rwxr-xr-x 2 root root  5770648 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-ld.gold*
-rwxr-xr-x 1 root root    11055 Aug  7 06:00 /usr/bin/arm-linux-gnueabihf-ldd*
-rwxr-xr-x 1 root root 39757680 Aug  7 06:09 /usr/bin/arm-linux-gnueabihf-lto-dump*
-rwxr-xr-x 2 root root  1132584 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-nm*
-rwxr-xr-x 2 root root  1270960 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-objcopy*
-rwxr-xr-x 2 root root  1982664 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-objdump*
-rwxr-xr-x 2 root root  1143952 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-ranlib*
-rwxr-xr-x 2 root root  1055336 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-readelf*
-rwxr-xr-x 1 root root  1111112 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-size*
-rwxr-xr-x 1 root root  1119464 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-strings*
-rwxr-xr-x 2 root root  1270960 Aug  7 05:45 /usr/bin/arm-linux-gnueabihf-strip*

# l /usr/lib/gcc/arm-linux-gnueabihf/14.2.0/
drwxr-xr-x 7 root root      4096 Aug  7 06:25 ./
drwxr-xr-x 3 root root      4096 Aug  7 06:25 ../
-rwxr-xr-x 1 root root  41355488 Aug  7 06:09 cc1*
-rwxr-xr-x 1 root root 122934144 Aug  7 06:09 cc1gm2*
-rwxr-xr-x 1 root root  44194384 Aug  7 06:09 cc1plus*
-rwxr-xr-x 1 root root    635496 Aug  7 06:09 collect2*
-rw-r--r-- 1 root root      1776 Aug  7 06:09 crtbegin.o
-rw-r--r-- 1 root root      2124 Aug  7 06:09 crtbeginS.o
-rw-r--r-- 1 root root      2068 Aug  7 06:09 crtbeginT.o
-rw-r--r-- 1 root root       988 Aug  7 06:09 crtend.o
-rw-r--r-- 1 root root       988 Aug  7 06:09 crtendS.o
-rw-r--r-- 1 root root       876 Aug  7 06:09 crtfastmath.o
drwxr-xr-x 3 root root      4096 Aug  7 06:25 include/
drwxr-xr-x 2 root root      4096 Aug  7 06:25 include-fixed/
drwxr-xr-x 3 root root      4096 Aug  7 06:25 install-tools/
-rw-r--r-- 1 root root   1313210 Aug  7 06:09 libgcc.a
-rw-r--r-- 1 root root     20368 Aug  7 06:09 libgcc_eh.a
-rw-r--r-- 1 root root     42570 Aug  7 06:09 libgcov.a
-rwxr-xr-x 1 root root     84016 Aug  7 06:09 liblto_plugin.so*
-rwxr-xr-x 1 root root   1172744 Aug  7 06:09 lto-wrapper*
-rwxr-xr-x 1 root root  39761128 Aug  7 06:09 lto1*
drwxr-xr-x 7 root root      4096 Aug  7 06:25 m2/
drwxr-xr-x 3 root root      4096 Aug  7 06:25 plugin/

Maybe you got some odd local make.conf options or your host compiler is broken. The only big one here is cc1gm2 with ~122 MB. But yeah, there is still some room for stripping.

After 14.2 update, package net upgrade size was 1395 MB. Some files are really huge now:

cc1 - 321 MB, cc1gm2 - 312 MB, cc1plus - 338 MB, lto1 - 303 MB, arm-linux-gnueabihf-lto-dump - 303 MB

Did you rebuild the whole chain starting by binutils? This libiberty issue often comes from a mismatching binutil/gcc build.

Running into this error right now, currently trying to figure out if it could be a misconfiguration on my system:

../../../gcc-13.2.0/libiberty/fibheap.c: In function ‘fibheap_replace_key_data’:
../../../gcc-13.2.0/libiberty/fibheap.c:38:25: error: ‘LONG_MIN’ undeclared (first use in this function)
   38 | #define FIBHEAPKEY_MIN  LONG_MIN
      |                         ^~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:220:30: note: in expansion of macro ‘FIBHEAPKEY_MIN’
  220 |   if (okey == key && okey != FIBHEAPKEY_MIN)
      |                              ^~~~~~~~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:36:1: note: ‘LONG_MIN’ is defined in header ‘<limits.h>’; did you forget to ‘#include <limits.h>’?
   35 | #include "fibheap.h"
  +++ |+#include <limits.h>
   36 | 
../../../gcc-13.2.0/libiberty/fibheap.c:38:25: note: each undeclared identifier is reported only once for each function it appears in
   38 | #define FIBHEAPKEY_MIN  LONG_MIN
      |                         ^~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:220:30: note: in expansion of macro ‘FIBHEAPKEY_MIN’
  220 |   if (okey == key && okey != FIBHEAPKEY_MIN)
      |                              ^~~~~~~~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c: In function ‘fibheap_delete_node’:
../../../gcc-13.2.0/libiberty/fibheap.c:38:25: error: ‘LONG_MIN’ undeclared (first use in this function)
   38 | #define FIBHEAPKEY_MIN  LONG_MIN
      |                         ^~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:261:36: note: in expansion of macro ‘FIBHEAPKEY_MIN’
  261 |   fibheap_replace_key (heap, node, FIBHEAPKEY_MIN);
      |                                    ^~~~~~~~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:38:25: note: ‘LONG_MIN’ is defined in header ‘<limits.h>’; did you forget to ‘#include <limits.h>’?
   38 | #define FIBHEAPKEY_MIN  LONG_MIN
      |                         ^~~~~~~~
../../../gcc-13.2.0/libiberty/fibheap.c:261:36: note: in expansion of macro ‘FIBHEAPKEY_MIN’
  261 |   fibheap_replace_key (heap, node, FIBHEAPKEY_MIN);
      |                                    ^~~~~~~~~~~~~~

Flex is not really the issue, you didn't install base-devel. Though, seeing that the Modula-2 guys rely on the old lexer/parser combo (f)lex and yacc/bison is kind of funny. It is old-school, just like Modula-2. ;-)

This currently fails for me with

flex -t ../../gcc-13.2.0/gcc/m2/mc/mc.flex > mcflex.c
mkdir -p -- m2/gm2-libs
/bin/sh: line 1: flex: command not found
-DIN_GCC -DCROSS_DIRECTORY_STRUCTURE
mkdir -p -- m2/boot-bin

installing the flex package fixed it, the author should update its dependencies to include flex.

Yeah, the author of the mpc sublib seem to have given up and does not update his gpg key anymore. The key is expired and in your pacman config it seems to be a problem. I remove it and that should do.