master branch: commit r15-4194 failed to bootstrap on Linux/x86_64 (commit r15-4186 builds)!

[haochenj--- via Gcc-regression]

make[2]: Entering directory '/export/home/haochenj/src/gcc-regression'
rm -rf bld
mkdir -p bld
cd bld; \
RUNTESTFLAGS="--target_board='unix{-m32,}'" ../src-master/configure \
        --with-arch=corei7 --with-cpu=corei7 --enable-clocale=gnu 
--with-system-zlib --enable-shared --enable-cet --with-demangler-in-ld 
--enable-libmpx --prefix=/usr/gcc-15.0.0 --with-fpmath=sse 
checking build system type... x86_64-pc-linux-gnu
    grep -E "(error:|Error)" makelog.r15-4194.x86_64.corei7 >> 
makelog.r15-4194.x86_64.corei7.mail; \
    tail -n +20 makelog.r15-4194.x86_64.corei7 | grep -C 10 -E "error:|Error:" 
>> makelog.r15-4194.x86_64.corei7.mail; \
make[6]: [Makefile:1832: x86_64-pc-linux-gnu/bits/largefile-config.h] Error 1 
(ignored)
make[6]: [Makefile:1831: x86_64-pc-linux-gnu/bits/largefile-config.h] Error 1 
(ignored)
make[6]: [Makefile:1832: x86_64-pc-linux-gnu/bits/largefile-config.h] Error 1 
(ignored)
../../src-master/libcpp/directives.cc:2078:20: error: unknown conversion type 
character ‘<’ in format [-Werror=format=]
../../src-master/libcpp/directives.cc:2078:34: error: unknown conversion type 
character ‘>’ in format [-Werror=format=]
make[6]: *** [Makefile:227: directives.o] Error 1
make[5]: *** [Makefile:12975: all-stage2-libcpp] Error 2
make[4]: *** [Makefile:30028: stage2-bubble] Error 2
make[3]: *** [Makefile:30272: bootstrap] Error 2
make[2]: *** [Makefile:313: bootstrap] Error 2
==================== Detailed Info around error (+- 10 Lines) 
====================
240 translated messages, 13 fuzzy translations, 21 untranslated messages.
274 translated messages.
4 translated messages, 86 fuzzy translations, 184 untranslated messages.
yes
checking for string.h... yes
checking for memory.h... yes
checking for strings.h... yes
checking for inttypes.h... yes
checking for stdint.h... yes
checking for unistd.h... ../../src-master/libcpp/directives.cc: In function 
‘void do_pragma_once(cpp_reader*)’:
../../src-master/libcpp/directives.cc:2078:20: error: unknown conversion type 
character ‘<’ in format [-Werror=format=]
 2078 |                  "%<#pragma once%> in main file");
      |                    ^
../../src-master/libcpp/directives.cc:2078:34: error: unknown conversion type 
character ‘>’ in format [-Werror=format=]
 2078 |                  "%<#pragma once%> in main file");
      |                                  ^
yes
checking for dlfcn.h... yes
checking for objdir... .libs
checking if  /export/home/haochenj/src/gcc-regression/bld/./prev-gcc/xgcc 
-B/export/home/haochenj/src/gcc-regression/bld/./prev-gcc/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/lib/ -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/include -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/sys-include   -fno-checking supports 
-fno-rtti -fno-exceptions... no
checking for  /export/home/haochenj/src/gcc-regression/bld/./prev-gcc/xgcc 
-B/export/home/haochenj/src/gcc-regression/bld/./prev-gcc/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/lib/ -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/include -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/sys-include   -fno-checking option to 
produce PIC... -fPIC -DPIC
checking if  /export/home/haochenj/src/gcc-regression/bld/./prev-gcc/xgcc 
-B/export/home/haochenj/src/gcc-regression/bld/./prev-gcc/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/lib/ -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/include -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/sys-include   -fno-checking PIC flag -fPIC 
-DPIC works... yes
checking if  /export/home/haochenj/src/gcc-regression/bld/./prev-gcc/xgcc 
-B/export/home/haochenj/src/gcc-regression/bld/./prev-gcc/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/lib/ -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/include -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/sys-include   -fno-checking static flag 
-static works... yes
checking if  /export/home/haochenj/src/gcc-regression/bld/./prev-gcc/xgcc 
-B/export/home/haochenj/src/gcc-regression/bld/./prev-gcc/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/bin/ 
-B/usr/gcc-15.0.0/x86_64-pc-linux-gnu/lib/ -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/include -isystem 
/usr/gcc-15.0.0/x86_64-pc-linux-gnu/sys-include   -fno-checking supports -c -o 
file.o... yes