Allow appending CXXFLAGS from command line

[robgjansen]

This allows appending CXXFLAGS from the command line when building libutp.

$ make before patch:

g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g  utp.cpp
g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g  utp_utils.cpp
rm -f libutp.a
ar q libutp.a utp.o utp_utils.o
ar: creating libutp.a
ranlib libutp.a

$ make after patch:

g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g  utp.cpp
g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g  utp_utils.cpp
rm -f libutp.a
ar q libutp.a utp.o utp_utils.o
ar: creating libutp.a
ranlib libutp.a

make CXXFLAGS=-fPIC before patch:

g++ -c -DPOSIX -I . -I utp_config_lib -fPIC utp.cpp
g++ -c -DPOSIX -I . -I utp_config_lib -fPIC utp_utils.cpp
rm -f libutp.a
ar q libutp.a utp.o utp_utils.o
ar: creating libutp.a
ranlib libutp.a

make CXXFLAGS=-fPIC after patch:

g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g -fPIC utp.cpp
g++ -c -DPOSIX -I . -I utp_config_lib -fno-exceptions -fno-rtti -Wall -g -fPIC utp_utils.cpp
rm -f libutp.a
ar q libutp.a utp.o utp_utils.o
ar: creating libutp.a
ranlib libutp.a

[massar]

That is a handy one! Will also definitely be something various distributions will want to have, as it also allows stack checking options, optimisations etc to be set that way.

[robgjansen]

FYI, you can also prepend flags with override CXXFLAGS += -fno-exceptions -fno-rtti -Wall -g and something like $ make CXXFLAGS=-fPIC.

http://stackoverflow.com/questions/2129391/append-to-gnu-make-variables-via-command-line

[robgjansen]

Guess no one cared enough and now I don't anymore either :/

[anacrolix]

Open source 🎉