How do I create a single Makefile with different compiler options for two sets of source code?

Posted on 2014-10-10
Last Modified: 2014-10-23
I have two groups of of C code and need to compile the first group with one set of compiler options and the second group with a different set of compiler options.  I am trying to do this with a single Makefile. The Makefile attached creates the dynamic library but uses the compiler options $CLFAGS0 for all source files instead of using $CFLAGS for the $SRCS set of source code and $CFLAGS0 for the $SRCS0 set of source code.

I am compiling with Solaris Studio 12.2 using dmake.

Question by:wayneb01
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LVL 34

Expert Comment

ID: 40380478
you may try the following:

## Compile Source Files to Object Files ##
OBJSCO = dpslock.o dpsunlock.o find_files.o xusrcmd.o getusrname.o
$(OBJSCO):  $(OBJDIR)/%.o : %.c
	$(CC) $(CFLAGSO) -o $@ -c $< $(INCLDSC)

OBJSC = bridge.o bridge_update.o bridge_load.o bridge_loc.o bridge_store.o
$(OBJSC): $(OBJDIR)/%.o: %.c
	$(CC) $(CFLAGS) -o $@ $<

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Author Comment

ID: 40381213
Sara,  I tried the change you listed, but dmake throws an error on $(OBJSCO):  $(OBJDIR)/%.o : %.c

dmake: Fatal error in reader: Makefile, line 37: Extra `:', `::', or `:=' on dependency line
LVL 34

Expert Comment

ID: 40382013
yes, unfortunately dmake is not compatible to gnu make.

you may try conditional macro definition like that:

## Compiler Options ##
CFLAGSX=-xCC -O -m64 -xcode=pic32 -Bdynamic

CFLAGSO =-O -dalign -xstrconst -errtags=yes -v -W2,-AKNR_S \
          -Wc,-Qiselect-funcalign=32 -Wc,-Qgsched-trace_late=1 -Wc,-Qgsched-T5 \

## Source Files ##
	dpslock.c \
	dpsunlock.c \
	find_files.c \
	xusrcmd.c \

	bridge.c \
	bridge_update.c \
	bridge_load.c \
	bridge_loc.c \

## Compile Source Files to Object Files ##
## redefine CFLAGS if target from OBJSCO list

## redefine CFLAGS if target from OBJSC list

$(OBJDIR)/%.o: %.c
	$(CC) $(CFLAGS) -o $@ -c $< 

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see 'Conditional Macros' in

if that doesn't work i would use 2 makefiles.


Author Comment

ID: 40390749
I tried to the conditional macros, but received an error from dmake.  Following your recommendation of using two makefiles, I created three makefiles.  Two makefiles with different compiler options and one to build the library from the objects.  This was successful.

In one last attempt to use a single makefile, I created different directories for the object files which worked.  Objects from one set of source files are written to one directory and the other set of source files are written to a different directory.  The same makefile then makes a library from both sets of objects.
LVL 34

Accepted Solution

sarabande earned 500 total points
ID: 40391765
the directory solution is the best because it  handles the case at designed. the conditional stuff always fights with the fact that make is not a programming language and that it is extremely difficult to handle groups of files differently when they were located in the same folders.


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