https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97543
Bug ID: 97543 Summary: powerpc64le: libgcc has unexpected long double in .gnu_attribute Product: gcc Version: 10.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libgcc Assignee: unassigned at gcc dot gnu.org Reporter: tuliom at ascii dot art.br Target Milestone: --- Alpine Linux uses musl as C Library. musl only supports long double as IEEE binary64. It does not support IBM long double. In this scenario, building gcc with --disable-multilib --with-long-double-64 still creates a libgcc with a .gnu_attribute pointing to IBM long double, causing unnecessary link time warnings. Reproduced as: $ cat test.c #include <stdio.h> #include <stdint.h> int main() { long double a = 2.0; __int128 b = 8; printf("sizeof(long double) = %ld\n", sizeof(long double)); printf("a * b = %Lf\n", a * (long double) b); return 0; } $ gcc test.c && ./a.out /usr/lib/gcc/powerpc64le-alpine-linux-musl/10.2.0/../../../../powerpc64le-alpine-linux-musl/bin/ld: /tmp/ccmCAapA.o uses 64-bit long double, /usr/lib/gcc/powerpc64le-alpine-linux-musl/10.2.0/../../../../lib/libgcc_s.so.1 uses 128-bit long double /usr/lib/gcc/powerpc64le-alpine-linux-musl/10.2.0/../../../../powerpc64le-alpine-linux-musl/bin/ld: /tmp/ccmCAapA.o uses 64-bit long double, /usr/lib/gcc/powerpc64le-alpine-linux-musl/10.2.0/../../../../lib/libgcc_s.so.1 uses 128-bit long double sizeof(long double) = 8 a * b = 16.000000 $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/libexec/gcc/powerpc64le-alpine-linux-musl/10.2.0/lto-wrapper Target: powerpc64le-alpine-linux-musl Configured with: /home/devel/aports/main/gcc/src/gcc-10.2.0/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --build=powerpc64le-alpine-linux-musl --host=powerpc64le-alpine-linux-musl --target=powerpc64le-alpine-linux-musl --with-pkgversion='Alpine 10.2.0' --enable-checking=release --disable-fixed-point --disable-libstdcxx-pch --disable-multilib --disable-nls --disable-werror --disable-symvers --enable-__cxa_atexit --enable-default-pie --enable-default-ssp --enable-cloog-backend --enable-languages=c,c++,objc,go,fortran,ada --with-abi=elfv2 --enable-secureplt --enable-decimal-float=no --enable-targets=powerpcle-linux --with-long-double-64 --disable-libquadmath --disable-libssp --disable-libmpx --disable-libmudflap --disable-libsanitizer --enable-shared --enable-threads --enable-tls --with-system-zlib --with-linker-hash-style=gnu Thread model: posix Supported LTO compression algorithms: zlib gcc version 10.2.0 (Alpine 10.2.0)