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[13]gcc dependency generation for a different output directory
vote up 1 vote down
star
I'm using gcc to generate a dependency file but my build rules put the
output into a subdirectory. Is there a way to tell gcc to put my
subdirectory prefix in the dependency file it generates for me?
gcc $(INCLUDES) -E -MM $(CFLAGS) $(SRC) >>$(DEP)
[14]c++ [15]gcc [16]makefile [17]dependency
offensive?
asked Sep 18 at 21:46
[18][2db54153755add15ae67c16bfba9b7e5?s=32&d=identicon&r=PG]
[19]KPexEA
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4 Answers:
[20]Oldest[21]Newest[22]Votes
vote up 1 vote down
check
The answer is in the [23]GCC manual: use the -MT flag.
-MT target Change the target of the rule emitted by dependency generation.
By default CPP takes the name of the main input file, deletes any
directory components and any file suffix such as `.c', and appends the
platform's usual object suffix. The result is the target.
An -MT option will set the target to be exactly the string you specify. If
you want multiple targets, you can specify them as a single argument to
-MT, or use multiple -MT options.
For example, -MT '$(objpfx)foo.o' might give
$(objpfx)foo.o: foo.c
[24]link|offensive?
answered Sep 19 at 3:27
[25][139450632a8b42b6f4564d6448e33688?s=32&d=identicon&r=PG]
[26]bk1e
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vote up 0 vote down
If there is an argument to gcc to do this, I don't know what it is. We end
up piping the dependency output through sed to rewrite all occurrences of .o
as ${OBJDIR}/.o
[27]link|offensive?
answered Sep 18 at 21:52
[28][a5274c69de87610590b2f62c2fa3ad0d?s=32&d=identicon&r=PG]
[29]Denton Gentry
4,976●5●17
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Ok, just to make sure I've got the question right: I'm assuming you have
test.c which includes test.h, and you want to generate subdir/test.d (while
not generating subdir/test.o) where subdir/test.d contains
subdir/test.o: test.c test.h
rather than
test.o: test.c test.h
which is what you get right now. Is that right?
I was not able to come up with an easy way to do exactly what you're asking
for. However, looking at
[30]http://www.gnu.org/software/gcc/news/dependencies.html, if you want to
create the .d file while you generate the .o file, you can use
gcc $(INCLUDES) -MMD $(CFLAGS) $(SRC) -o $(SUBDIR)/$(OBJ)
(Given SRC=test.c, SUBDIR=subdir, and OBJ=test.o) This will create both
subdir/test.o and subdir/test.d, where subdir/test.d contains the desired
output as above. Hope that helps.
[31]link|offensive?
answered Sep 18 at 22:38
[c749fe5f20f7e2045cf312767496d0b4?s=32&d=identicon&r=PG]
Emile
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vote up 0 vote down
1. [GNU] make gets angry if you don't place the output in the current
directory. What you really should do is run make from the build
directory, and use the VPATH make variable to locate the source code. If
you lie to a compiler, sooner or later it will take its revenge.
2. If you insist on generating your objects and dependencies in some other
directory, you need to use the -o argument as answered by Emile.
[32]link|offensive?
answered Sep 18 at 23:10
[33][aea3ad606f964cb4b710951d75318d6a?s=32&d=identicon&r=PG]
[34]florin
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