Defined in 2 files as a prototype:

• contrib/libstdc++/libmath/mathconf.h, line 136 (as a prototype)
• lib/msun/src/math.h, line 193 (as a prototype)

Defined in 3 files as a function:

• contrib/libstdc++/libmath/signbitf.c, line 35 (as a function)
• contrib/llvm/tools/clang/lib/Headers/__clang_cuda_device_functions.h, line 522 (as a function)
• lib/msun/src/s_signbit.c, line 45 (as a function)

Referenced in 3 files:

• contrib/libstdc++/libmath/mathconf.h, line 142
• contrib/llvm/tools/clang/lib/Headers/__clang_cuda_cmath.h, line 143
• lib/msun/src/math.h, line 134