Bug when compiling with gcc 15

[Dima Pasechnik]

On August 20, 2025 12:01:44 PM CDT, William Youmans <youmans.wj at gmail.com> wrote:
>Hi Dima,
>
>Thanks for the reply. This issue is unrelated to sage. I do have sagemath
>installed using the Arch package manager which works fine, and like I
>mentioned the latest gmp Arch package also works fine, which seems to be
>due to the patch I linked fixing the bug with gcc 15.
>
>The bug I am reporting is: building gmp with gcc 15 gives the previously
>mentioned error. Using gcc 14 it builds fine.
>
>Best,
>Will
>
>On Mon, Aug 18, 2025 at 1:02 PM Dima Pasechnik <dima at pasechnik.info> wrote:
>
>> Hi,
>> Thanks for the message.
>> You really don't need to build any sage's spkg's from source on Arch.
>> (in particular such packages like gmp, which are basically dead wood in
>> the sagemath tree)
>>
>> Actually, Arch provides an up to date sagemath package to install, so,
>> unless you want to hack on Sage source, you most probably just can use.
>>
>>
>> You can install all the Arch packages you need by looking at the bottom
>> part of the output of the main ./configure.
>> Or you can get the list by
>> running in terminal the following 3 commands.
>>
>> cat build/pkgs/[a-z]/distros/arch.txt
>> cat build/pkgs/_pre*/distros/arch.txt
>> cat build/pkgs/_boo*/distros/arch.txt
>>
>> HTH
>> Dima
>>
>>
>> On Tue, Jul 29, 2025 at 12:10:41AM -0400, William Youmans wrote:
>> > Hi,
>> >
>> > This may overlap with known build issues but I'm not sure. Configuring
>> GMP
>> > with gcc 15 on a fresh Arch install fails (with essential development
>> tools
>> > from `base-devel` installed).
>> >
>> > $ ./configure
>> > checking build system type... raptorlake-pc-linux-gnu
>> > checking host system type... raptorlake-pc-linux-gnu
>> > checking for a BSD-compatible install... /usr/bin/install -c
>> > checking whether build environment is sane... yes
>> > checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
>> > checking for gawk... gawk
>> > checking whether make sets $(MAKE)... yes
>> > checking whether make supports nested variables... yes
>> > checking whether to enable maintainer-specific portions of Makefiles...
>> no
>> > checking ABI=64
>> > checking compiler gcc -O2 -pedantic -fomit-frame-pointer -m64 ... no,
>> long
>> > long reliability test 1
>> > checking whether cc is gcc... yes
>> > checking compiler cc -O2 -pedantic -fomit-frame-pointer -m64 ... no, long
>> > long reliability test 1
>> > checking ABI=x32
>> > checking compiler gcc -O2 -pedantic -fomit-frame-pointer -mx32 ... no
>> > checking whether cc is gcc... yes
>> > checking compiler cc -O2 -pedantic -fomit-frame-pointer -mx32 ... no
>> > checking ABI=32
>> > checking compiler gcc -m32 -O2 -pedantic -fomit-frame-pointer ... no
>> > checking compiler gcc -O2 -pedantic -fomit-frame-pointer ... no, long
>> long
>> > reliability test 1
>> > checking compiler icc -no-gcc ... no
>> > checking whether cc is gcc... yes
>> > checking compiler cc -m32 -O2 -pedantic -fomit-frame-pointer ... no
>> > checking compiler cc -O2 -pedantic -fomit-frame-pointer ... no, long long
>> > reliability test 1
>> > configure: error: could not find a working compiler, see config.log for
>> > details
>> >
>> >
>> > GMP can be installed without issue with the arch linux package manager,
>> and
>> > looking at the arch repository they seem to have a patch for gmp with gcc
>> > 15:
>> >
>> https://gitlab.archlinux.org/archlinux/packaging/packages/gmp/-/blob/main/gmp-gcc-15.patch?ref_type=heads
>> >
>> >
>> > More info:
>> >
>> >
>> > gmp version: gmp 6.3.0
>> >
>> > $ gcc -v
>> > Using built-in specs.
>> > COLLECT_GCC=gcc
>> > COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/15.1.1/lto-wrapper
>> > Target: x86_64-pc-linux-gnu
>> > Configured with: /build/gcc/src/gcc/configure
>> > --enable-languages=ada,c,c++,d,fortran,go,lto,m2,objc,obj-c++,rust,cobol
>> > --enable-bootstrap --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib
>> > --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=
>> > https://gitlab.archlinux.org/archlinux/packaging/packages/gcc/-/issues
>> > --with-build-config=bootstrap-lto --with-linker-hash-style=gnu
>> > --with-system-zlib --enable-__cxa_atexit --enable-cet=auto
>> > --enable-checking=release --enable-clocale=gnu --enable-default-pie
>> > --enable-default-ssp --enable-gnu-indirect-function
>> > --enable-gnu-unique-object --enable-libstdcxx-backtrace
>> > --enable-link-serialization=1 --enable-linker-build-id --enable-lto
>> > --enable-multilib --enable-plugin --enable-shared --enable-threads=posix
>> > --disable-libssp --disable-libstdcxx-pch --disable-werror
>> > Thread model: posix
>> > Supported LTO compression algorithms: zlib zstd
>> > gcc version 15.1.1 20250425 (GCC)
>> >
>> > $ uname -a
>> > Linux archlinux 6.15.8-arch1-1 #1 SMP PREEMPT_DYNAMIC Thu, 24 Jul 2025
>> > 18:18:11 +0000 x86_64 GNU/Linux
>> >
>> > $ ./config.guess
>> > raptorlake-pc-linux-gnu
>> >
>> > Compressed config.log is attached.
>> >
>> > Best,
>> > Will
>>
>>
>> > _______________________________________________
>> > gmp-bugs mailing list
>> > gmp-bugs at gmplib.org
>> > https://gmplib.org/mailman/listinfo/gmp-bugs
>>
>>

Hi,
it's not new, already fixed in gmp trunk, as far as I can see:

<https://gmplib.org/list-archives/gmp-devel/2025-March/006294.html>

Best,
Dima