tldr: Is the compiler -Werrror flag passed by default in conan 1.29? How can you avoid passing it?
After updating apple-clang to 12.0 and conan to 1.29.2, I can no longer build a custom VTK conan package I've used for at least 6 months. I have no problem building the full VTK 9.0.1 using the default cmake setup that comes with the source. But for my conan build I now get the following build error which looks like it's caused by a -Werror flag forcing a warning into an error. Is this normally just a warning and, if so how can I turn off the -Werror flag for conan builds?
ThirdParty/hdf5/vtkhdf5/src/H5Fsuper.c:1397:16: error:
implicit declaration of function 'vtkhdf5_H5O__fsinfo_set_version' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
if(H5O__fsinfo_set_version(f, &fsinfo) < 0)
^
ThirdParty/hdf5/vtkhdf5/src/vtk_hdf5_mangle.h:1882:33: note:
expanded from macro 'H5O__fsinfo_set_version'
#define H5O__fsinfo_set_version vtkhdf5_H5O__fsinfo_set_version