Testcase: --- static inline int x(int y) { return __builtin_choose_expr(__builtin_constant_p(y), 1, 0); } int foo(void) { return x(3); } --- $ i386-linux-gcc constant_not_constant.c -O3 -c constant_not_constant.c: In function 'x': constant_not_constant.c:4:9: error: first argument to '__builtin_choose_expr' not a constant return __builtin_choose_expr(__builtin_constant_p(y), 1, 0); ^ $ i386-linux-gcc -v Using built-in specs. COLLECT_GCC=i386-linux-gcc COLLECT_LTO_WRAPPER=/home/cody/x-buildall/libexec/gcc/i386-linux/4.8.1/lto-wrapper Target: i386-linux Configured with: /home/cody/g/gcc/configure --target=i386-linux --enable-targets=all --prefix=/home/cody/x-buildall --enable-languages=c --without-headers --enable-sjlj-exceptions --with-system-libunwind --disable-nls --disable-threads --disable-shared --disable-libmudflap --disable-libssp --disable-libgomp --disable-decimal-float --disable-libquadmath --enable-checking=release --disable-libatomic : (reconfigured) /home/cody/g/gcc/configure --target=i386-linux --enable-targets=all --prefix=/home/cody/x-buildall --enable-languages=c --without-headers --enable-sjlj-exceptions --with-system-libunwind --disable-nls --disable-threads --disable-shared --disable-libmudflap --disable-libssp --disable-libgomp --disable-decimal-float --disable-libquadmath --enable-checking=release --disable-libatomic : (reconfigured) /home/cody/g/gcc/configure --target=i386-linux --enable-targets=all --prefix=/home/cody/x-buildall --enable-languages=c --without-headers --enable-sjlj-exceptions --with-system-libunwind --disable-nls --disable-threads --disable-shared --disable-libmudflap --disable-libssp --disable-libgomp --disable-decimal-float --disable-libquadmath --enable-checking=release --disable-libatomic : (reconfigured) /home/cody/g/gcc/configure --target=i386-linux --enable-targets=all --prefix=/home/cody/x-buildall --enable-languages=c --without-headers --enable-sjlj-exceptions --with-system-libunwind --disable-nls --disable-threads --disable-shared --disable-libmudflap --disable-libssp --disable-libgomp --disable-decimal-float --disable-libquadmath --enable-checking=release --disable-libatomic Thread model: single gcc version 4.8.1 20130328 (prerelease) (GCC)
This also affects my ubuntu gcc install: $ gcc constant_not_constant.c -O3 -c constant_not_constant.c: In function ‘x’: constant_not_constant.c:4:31: error: first argument to ‘__builtin_choose_expr’ not a constant $ gcc -v Using built-in specs. COLLECT_GCC=/usr/bin/gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.6/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.6.3-1ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.6/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.6 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.6 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)
I guess dup of PR19449.
. *** This bug has been marked as a duplicate of bug 19449 ***