CPPFLAGS (preprocessor flags) used without compilter flags

[dreyer]

Some of Singular's target use CPPFLAGS for defining flags to the preprocessor, but not customizable flags for the compiler, like CFLAGS and CXXFLAGS.

This means that for those targets, the preprocessor settings can be changed, while the compiler settings are hardcoded.

A good example are the %.og targets from Singular/Makefile.in. The Makefile.in already uses the variable CXXFLAGSG here, but it is not handled by the ./configure script.

[seelisch]

addressed in SINGULAR restructuring (see git repo @ Berlios)