Re: Per-file flags in a GNUmakefile?

[Wolfgang Lux]

David Chisnall wrote:

> For LanguageKit, I need to build almost everything in ARC mode, but one file 
> (which does all manner of evil bit twiddling) in legacy mode.  How do I 
> specify an extra set of OBJCFLAGS to be added for a single file with GNUstep 
> Make?

I found this comment in rules.make:
#
# In exceptional conditions, you might need to want to use different compiler
# flags for a file (for example, if a file doesn't compile with optimization
# turned on, you might want to compile that single file with optimizations
# turned off).  gnustep-make allows you to do this - you can specify special 
# flags to be used when compiling a *specific* file in two ways - 
#
# xxx_FILE_FLAGS (where xxx is the file name, such as main.m) 
#                are special compilation flags to be used when compiling xxx
#
# xxx_FILE_FILTER_OUT_FLAGS (where xxx is the file name, such as mframe.m)
#                is a filter-out make pattern of flags to be filtered out 
#                from the compilation flags when compiling xxx.
#
# Typical examples:
#
# Disable optimization flags for the file NSInvocation.m:
# NSInvocation.m_FILE_FILTER_OUT_FLAGS = -O%
#
# Disable optimization flags for the same file, and also remove 
# -fomit-frame-pointer:
# NSInvocation.m_FILE_FILTER_OUT_FLAGS = -O% -fomit-frame-pointer
#
# Force the compiler to warn for #import if used in file file.m:
# file.m_FILE_FLAGS = -Wimport
# file.m_FILE_FILTER_OUT_FLAGS = -Wno-import
#

Wolfgang