How to define C++ preprocessor variable in Makefile
up vote
37
down vote
favorite
I have a C++ preprocessor written like this:
#ifdef cpp_variable
//x+y;
#endif
please anyone tell me how to define this in Makefile.
thanks!
c++
asked Mar 6 '11 at 22:11
Joel
186124
add a comment |
up vote
37
down vote
favorite
I have a C++ preprocessor written like this:
#ifdef cpp_variable
//x+y;
#endif
please anyone tell me how to define this in Makefile.
thanks!
c++
asked Mar 6 '11 at 22:11
Joel
186124
add a comment |
up vote
37
down vote
favorite
up vote
37
down vote
favorite
I have a C++ preprocessor written like this:
#ifdef cpp_variable
//x+y;
#endif
please anyone tell me how to define this in Makefile.
thanks!
c++
asked Mar 6 '11 at 22:11
Joel
186124
I have a C++ preprocessor written like this:
#ifdef cpp_variable
//x+y;
#endif
please anyone tell me how to define this in Makefile.
thanks!
c++
c++
asked Mar 6 '11 at 22:11
Joel
186124
asked Mar 6 '11 at 22:11
Joel
186124
asked Mar 6 '11 at 22:11
Joel
186124
asked Mar 6 '11 at 22:11
Joel
186124
asked Mar 6 '11 at 22:11
Joel
186124
186124
add a comment |
add a comment |
5 Answers
5
active
oldest
votes
up vote
36
down vote
This is compiler specific.
GCC uses -Dcpp_variable=VALUE or just -Dcpp_variable
Microsoft's compilers use /D
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
add a comment |
up vote
25
down vote
Search your compiler documentation to find how to do that.
For example for g++ the syntax is :
g++ -Dcpp_variable <other stuff>
Which corresponds to adding
CPPFLAGS += -Dcpp_variable
in your makefile.
edited Aug 18 '17 at 21:58
eddi
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
add a comment |
up vote
9
down vote
Add to Makefile:
CPPFLAGS = -Dcpp_variable
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
add a comment |
up vote
4
down vote
The syntax is compiler specific, for gcc use the -D option like so: -Dcpp_variable.
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
add a comment |
up vote
0
down vote
Take a variable in Makefile and whatever you need to define in it just add -DXXX. Where XXX in you case is cpp_variable.
For example
COMPILE_OPTS = -DXXX
g++ -c $(COMPILE_OPTS) $<
answered Nov 22 at 6:27
Akhil Pathania
11
add a comment |
5 Answers
5
active
oldest
votes
5 Answers
5
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
36
down vote
This is compiler specific.
GCC uses -Dcpp_variable=VALUE or just -Dcpp_variable
Microsoft's compilers use /D
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
add a comment |
up vote
36
down vote
This is compiler specific.
GCC uses -Dcpp_variable=VALUE or just -Dcpp_variable
Microsoft's compilers use /D
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
add a comment |
up vote
36
down vote
up vote
36
down vote
This is compiler specific.
GCC uses -Dcpp_variable=VALUE or just -Dcpp_variable
Microsoft's compilers use /D
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
This is compiler specific.
GCC uses -Dcpp_variable=VALUE or just -Dcpp_variable
Microsoft's compilers use /D
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
answered Mar 6 '11 at 22:16
Reed Copsey
464k579671270
464k579671270
add a comment |
add a comment |
up vote
25
down vote
Search your compiler documentation to find how to do that.
For example for g++ the syntax is :
g++ -Dcpp_variable <other stuff>
Which corresponds to adding
CPPFLAGS += -Dcpp_variable
in your makefile.
edited Aug 18 '17 at 21:58
eddi
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
add a comment |
up vote
25
down vote
Search your compiler documentation to find how to do that.
For example for g++ the syntax is :
g++ -Dcpp_variable <other stuff>
Which corresponds to adding
CPPFLAGS += -Dcpp_variable
in your makefile.
edited Aug 18 '17 at 21:58
eddi
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
add a comment |
up vote
25
down vote
up vote
25
down vote
Search your compiler documentation to find how to do that.
For example for g++ the syntax is :
g++ -Dcpp_variable <other stuff>
Which corresponds to adding
CPPFLAGS += -Dcpp_variable
in your makefile.
edited Aug 18 '17 at 21:58
eddi
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
Search your compiler documentation to find how to do that.
For example for g++ the syntax is :
g++ -Dcpp_variable <other stuff>
Which corresponds to adding
CPPFLAGS += -Dcpp_variable
in your makefile.
edited Aug 18 '17 at 21:58
eddi
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
edited Aug 18 '17 at 21:58
eddi
41.5k571125
edited Aug 18 '17 at 21:58
eddi
41.5k571125
edited Aug 18 '17 at 21:58
eddi
41.5k571125
41.5k571125
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
answered Mar 6 '11 at 22:14
fouronnes
2,3791233
2,3791233
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
add a comment |
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
2
2
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
Technically, because you can do it from the commandline, it can be done from the makefile -- just put the relevant command in the makefile. (pedantry aside, this comment may not have actually been correct when this answer was written)
– Nic Hartley
May 9 '16 at 12:47
add a comment |
up vote
9
down vote
Add to Makefile:
CPPFLAGS = -Dcpp_variable
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
add a comment |
up vote
9
down vote
Add to Makefile:
CPPFLAGS = -Dcpp_variable
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
add a comment |
up vote
9
down vote
up vote
9
down vote
Add to Makefile:
CPPFLAGS = -Dcpp_variable
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
Add to Makefile:
CPPFLAGS = -Dcpp_variable
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
answered Jan 27 '15 at 17:39
Peter Tseng
8,84814642
8,84814642
add a comment |
add a comment |
up vote
4
down vote
The syntax is compiler specific, for gcc use the -D option like so: -Dcpp_variable.
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
add a comment |
up vote
4
down vote
The syntax is compiler specific, for gcc use the -D option like so: -Dcpp_variable.
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
add a comment |
up vote
4
down vote
up vote
4
down vote
The syntax is compiler specific, for gcc use the -D option like so: -Dcpp_variable.
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
The syntax is compiler specific, for gcc use the -D option like so: -Dcpp_variable.
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
answered Mar 6 '11 at 22:14
Eugen Constantin Dinca
7,89312347
7,89312347
add a comment |
add a comment |
up vote
0
down vote
Take a variable in Makefile and whatever you need to define in it just add -DXXX. Where XXX in you case is cpp_variable.
For example
COMPILE_OPTS = -DXXX
g++ -c $(COMPILE_OPTS) $<
answered Nov 22 at 6:27
Akhil Pathania
11
add a comment |
up vote
0
down vote
Take a variable in Makefile and whatever you need to define in it just add -DXXX. Where XXX in you case is cpp_variable.
For example
COMPILE_OPTS = -DXXX
g++ -c $(COMPILE_OPTS) $<
answered Nov 22 at 6:27
Akhil Pathania
11
add a comment |
up vote
0
down vote
up vote
0
down vote
Take a variable in Makefile and whatever you need to define in it just add -DXXX. Where XXX in you case is cpp_variable.
For example
COMPILE_OPTS = -DXXX
g++ -c $(COMPILE_OPTS) $<
answered Nov 22 at 6:27
Akhil Pathania
11
Take a variable in Makefile and whatever you need to define in it just add -DXXX. Where XXX in you case is cpp_variable.
For example
COMPILE_OPTS = -DXXX
g++ -c $(COMPILE_OPTS) $<
answered Nov 22 at 6:27
Akhil Pathania
11
answered Nov 22 at 6:27
Akhil Pathania
11
answered Nov 22 at 6:27
Akhil Pathania
11
answered Nov 22 at 6:27
Akhil Pathania
11
11
add a comment |
add a comment |
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