makefile - make, write a rule for single file -

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i need file have dedicated rule use special flags. use 

$(objdir)/%.$(oe): special_file.c     $(echo) "compiling file $< => $@"      $(cc)  $(cflags) $(cflags_special) $(defines) $(include) $< -o $@  $(objdir)/%.$(oe): %.c $(objdir)     $(echo) "compiling file $< => $@"      $(cc)  $(cflags) $(defines) $(include) $< -o $@

but isn't working special_file.c. seems path not known, when comment special rule , let make files, file compiling fine.

how divert make rule 1 file?

thanks in advance,

you should use target-specific variable values:

$(objdir)/special_file.$(oe): cflags += --specific_flags $(objdir)/special_file.$(oe): special_file.c  $(objdir)/%.$(oe): %.c $(objdir)     $(echo) "compiling file $< => $@"      $(cc)  $(cflags) $(defines) $(include) $< -o $@

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