Seems that multi-lib is a necessity these days at least on Debian 13.3 :
LAST_UPDATED: Obtained from git: releases/gcc-15.2.0 revision
5115c7e447fc07457443df874bf57840e8316d5f
=== acats tests ===
=== acats Summary ===
# of expected passes 2328
# of unexpected failures 0
Native configuration is x86_64-pc-linux-gnu
=== gcc tests ===
Running target unix
XPASS: gcc.dg/guality/example.c -O0 execution test
XPASS: gcc.dg/guality/example.c -O1 -DPREVENT_OPTIMIZATION execution
test
XPASS: gcc.dg/guality/example.c -Og -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/guality.c -O0 execution test
XPASS: gcc.dg/guality/guality.c -O1 -DPREVENT_OPTIMIZATION execution
test
XPASS: gcc.dg/guality/guality.c -O2 -DPREVENT_OPTIMIZATION execution
test
XPASS: gcc.dg/guality/guality.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/guality.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/guality.c -O3 -g -DPREVENT_OPTIMIZATION
execution test
XPASS: gcc.dg/guality/guality.c -Os -DPREVENT_OPTIMIZATION execution
test
XPASS: gcc.dg/guality/guality.c -Og -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/inline-params.c -O2 -DPREVENT_OPTIMIZATION
execution test
XPASS: gcc.dg/guality/inline-params.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/inline-params.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION execution test
XPASS: gcc.dg/guality/inline-params.c -O3 -g -DPREVENT_OPTIMIZATION
execution test
XPASS: gcc.dg/guality/inline-params.c -Os -DPREVENT_OPTIMIZATION
execution test
FAIL: gcc.dg/guality/loop-1.c -O2 -DPREVENT_OPTIMIZATION line 20 i == 1
FAIL: gcc.dg/guality/loop-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 20 i == 1
FAIL: gcc.dg/guality/loop-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 20 i == 1
FAIL: gcc.dg/guality/loop-1.c -O3 -fomit-frame-pointer -funroll-loops
-fpeel-loops -ftracer -finline-functions -DPREVENT_OPTIMIZATION line
20 i == 1
FAIL: gcc.dg/guality/loop-1.c -O3 -g -DPREVENT_OPTIMIZATION line 20
i == 1
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg1 == 1
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg2 == 2
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg3 == 3
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg4 == 4
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg5 == 5
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg6 == 6
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 arg7 == 30
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg1 == 1
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg2 == 2
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg3 == 3
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg4 == 4
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg5 == 5
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg6 == 6
FAIL: gcc.dg/guality/pr36728-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 18 arg7 == 30
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg1 == 1
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg2 == 2
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg3 == 3
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg4 == 4
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg5 == 5
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg6 == 6
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
16 arg7 == 30
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg1 == 1
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg2 == 2
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg3 == 3
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg4 == 4
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg5 == 5
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg6 == 6
FAIL: gcc.dg/guality/pr36728-2.c -O3 -g -DPREVENT_OPTIMIZATION line
18 arg7 == 30
FAIL: gcc.dg/guality/pr36728-4.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 14 y == 2
FAIL: gcc.dg/guality/pr36728-4.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 16 y == 2
FAIL: gcc.dg/guality/pr36728-4.c -O3 -g -DPREVENT_OPTIMIZATION line
14 y == 2
FAIL: gcc.dg/guality/pr36728-4.c -O3 -g -DPREVENT_OPTIMIZATION line
16 y == 2
XPASS: gcc.dg/guality/pr41353-1.c -O1 -DPREVENT_OPTIMIZATION line 28
j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -O2 -DPREVENT_OPTIMIZATION line 28
j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 28 j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 28 j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -O3 -g -DPREVENT_OPTIMIZATION line
28 j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -Os -DPREVENT_OPTIMIZATION line 28
j == 28 + 37
XPASS: gcc.dg/guality/pr41353-1.c -Og -DPREVENT_OPTIMIZATION line 28 j
== 28 + 37
FAIL: gcc.dg/guality/pr43051-1.c -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions
-DPREVENT_OPTIMIZATION line 34 c == &a[0]
FAIL: gcc.dg/guality/pr43051-1.c -O3 -fomit-frame-pointer
-funroll-loops -fpeel-loops -ftracer -finline-functions
-DPREVENT_OPTIMIZATION line 39 c == &a[0]
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 20 y == 25
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 20 z == 6
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 23 y == 117
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 23 z == 8
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 20 y == 25
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 20 z == 6
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 23 y == 117
FAIL: gcc.dg/guality/pr54519-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 23 z == 8
FAIL: gcc.dg/guality/pr54519-2.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 20 y == 25
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 20 z == 6
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 23 y == 117
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 23 z == 8
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 20 y == 25
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 20 z == 6
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 23 y == 117
FAIL: gcc.dg/guality/pr54519-3.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 23 z == 8
FAIL: gcc.dg/guality/pr54519-4.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-4.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-5.c -O2 -flto -fno-use-linker-plugin
-flto-partition=none -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-5.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 17 y == 25
FAIL: gcc.dg/guality/pr54519-6.c -Os -DPREVENT_OPTIMIZATION line 11
x == 2
FAIL: gcc.dg/guality/pr54693-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 21 x == 10 - i
FAIL: gcc.dg/guality/pr54693-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 21 y == 20 - 2 * i
FAIL: gcc.dg/guality/pr54693-2.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 21 z == 30 - 3 * i
FAIL: gcc.dg/guality/pr56154-1.c -Og -DPREVENT_OPTIMIZATION line
pr56154-1.c:20 x.a == 6
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:17 s1.f == 5.0
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:17 s1.g == 6.0
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:17 s2.f == 0.0
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:20 s1.f == 5.0
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:20 s1.g == 6.0
FAIL: gcc.dg/guality/pr59776.c -Og -DPREVENT_OPTIMIZATION line
pr59776.c:20 s2.f == 5.0
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 21 a.i == 4
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 21 a.j == 14
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 32 a[0] == 4
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 32 a[1] == 14
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 43 a.i == 4
FAIL: gcc.dg/guality/sra-1.c -O2 -flto -fuse-linker-plugin
-fno-fat-lto-objects -DPREVENT_OPTIMIZATION line 43 a.j == 14
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 21 a.i == 4
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 21 a.j == 14
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 32 a[0] == 4
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 32 a[1] == 14
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 43 a.i == 4
FAIL: gcc.dg/guality/sra-1.c -Og -DPREVENT_OPTIMIZATION line 43 a.j == 14
=== gcc Summary ===
# of expected passes 216993
# of unexpected failures 84
# of unexpected successes 23
# of expected failures 1554
# of unsupported tests 3880
/usr/local/build/gcc-15.2.0_006/gcc/xgcc version 15.2.0 (GENUNIX Mon
Feb 23 10:47:30 UTC 2026)
=== gfortran tests ===
Running target unix
=== gfortran Summary ===
# of expected passes 73191
# of expected failures 343
# of unsupported tests 80
/usr/local/build/gcc-15.2.0_006/gcc/gfortran version 15.2.0 (GENUNIX
Mon Feb 23 10:47:30 UTC 2026)
=== g++ tests ===
Running target unix
FAIL: g++.dg/guality/pr55665.C -O2 -flto -fno-use-linker-plugin
-flto-partition=none line 23 p == 40
=== g++ Summary ===
# of expected passes 248913
# of unexpected failures 1
# of expected failures 2282
# of unsupported tests 2079
/usr/local/build/gcc-15.2.0_006/gcc/xg++ version 15.2.0 (GENUNIX Mon
Feb 23 10:47:30 UTC 2026)
=== gnat tests ===
Running target unix
=== gnat Summary ===
# of expected passes 3559
# of expected failures 25
# of unsupported tests 5
/usr/local/build/gcc-15.2.0_006/gcc/gnatmake version 15.2.0
=== libatomic tests ===
Running target unix
=== libatomic Summary ===
# of expected passes 54
=== libgomp tests ===
Running target unix
=== libgomp Summary ===
# of expected passes 17195
# of expected failures 285
# of unsupported tests 696
=== libitm tests ===
Running target unix
=== libitm Summary ===
# of expected passes 44
# of expected failures 3
# of unsupported tests 1
=== libstdc++ tests ===
Running target unix
=== libstdc++ Summary ===
# of expected passes 19336
# of expected failures 131
# of unsupported tests 747
Compiler version: 15.2.0
Platform: x86_64-pc-linux-gnu
configure flags: --prefix=/usr/local/imed/gcc15
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
--build=x86_64-linux-gnu --with-gnu-as --with-as=/usr/bin/as
--with-gnu-ld --with-ld=/usr/bin/ld --disable-nls
--enable-threads=posix --enable-shared --enable-bootstrap
--enable-stage1-languages=c,c++ --enable-stage1-checking=misc
--enable-languages=ada,c,c++,fortran,lto --enable-checking=misc
--with-pkgversion='GENUNIX Mon Feb 23 10:47:30 UTC 2026'
EOF
--
--
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
