The project that I am trying to build has default flags
CFLAGS = -Wall -g -O2
CXXFLAGS = -g -O2
I need to append a flag -w
to both these variables (to remove: 'consider all warnings as errors')
I have a method to work it out, give
make 'CFLAGS=-Wall -g -O2 -w'; 'CXXFLAGS=-g -O2 -w'
OR
Run ./configure
and statically modify Makefile
But I want to append my options with the existing options while running configure
or make
The post Where to add a CFLAG, such as -std=gnu99, into an autotools project conveniently uses a macro to achieve this.
You almost have it right; why did you add the semicolon?
To do it on the configure
line:
./configure CFLAGS='-g -O2 -w' CXXFLAGS='-g -O2 -w'
To do it on the make
line:
make CFLAGS='-g -O2 -w' CXXFLAGS='-g -O2 -w'
However, that doesn't really remove consider all warnings as errors; that removes all warnings. So specifying both -Wall
and -w
doesn't make sense. If you want to keep the warnings but not have them considered errors, use the -Wall -Wno-error
flags.
Alternatively, most configure
scripts which enable -Werror
by default also have a flag such as --disable-werror
or similar. Run ./configure --help
and see if there's something like that.