https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108734
Bug ID: 108734
Summary: powerpc: False Detection of __atomic_*_8 Builtins
Product: gcc
Version: 11.3.0
Status: UNCONFIRMED
Keywords: rejects-valid
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: rmclure at linux dot ibm.com
CC: bergner at gcc dot gnu.org
Target Milestone: ---
Created attachment 54440
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54440&action=edit
False positive with __has_builtin
Using built-in specs.
COLLECT_GCC=powerpc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc-cross/powerpc-linux-gnu/12/lto-wrapper
Target: powerpc-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 12.2.0-3ubuntu1'
--with-bugurl=file:///usr/share/doc/gcc-12/README.Bugs
--enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-12 --enable-shared
--enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/
--enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm
--disable-libquadmath --disable-libquadmath-support --enable-plugin
--with-system-zlib --enable-libphobos-checking=release
--without-target-system-zlib --with-libphobos-druntime-only=yes
--enable-secureplt --disable-softfloat --with-cpu=default32 --disable-softfloat
--enable-targets=powerpc-linux,powerpc64-linux --enable-multiarch
--disable-werror --with-long-double-128 --enable-multilib
--enable-checking=release --build=powerpc64le-linux-gnu
--host=powerpc64le-linux-gnu --target=powerpc-linux-gnu
--program-prefix=powerpc-linux-gnu- --includedir=/usr/powerpc-linux-gnu/include
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 12.2.0 (Ubuntu 12.2.0-3ubuntu1)
The attached program should compile on 32-bit systems, built with
`powerpc-linux-gnu-gcc fail.c -o fail`.
Instead, __has_builtin(__atomic_store_8) evaluates to true, and we get a linker
error.
```
/usr/lib/gcc-cross/powerpc-linux-gnu/11/../../../../powerpc-linux-gnu/bin/ld:
/tmp/ccJ9g2pV.o: in function `main':
fail.c:(.text+0x24): undefined reference to `__atomic_store_8'
collect2: error: ld returned 1 exit status
```
