id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6887,Hardcoded path to g++ in gcc.mak and gcc-shared.mak for regex,Morten Rasmussen <mortenrasmussen@…>,John Maddock,"The makefiles gcc.mak and gcc-shared.mak in boost/libs/regex/build both contain the lines

CXX=g++
LINKER=g++ -shared

which means that the compiler will pick the g++ defined by the PATH variable.

This is unfortunate if you have multiple gcc version on the machine and intend to link boost regex with modules compiled with another g++ version than the one defined by PATH.

To fix this, I suggest that these lines are changed to 

CXX?=g++
LINKER=$(CXX) -shared

so that a CXX value passed to the makefile will prevail, and ""g++"" is still if no value is passed.

In other words: this suggestion adds the option of passing an alternative CXX value to the makefile - the suggestion will be backward compatible by working as before if no value is passed.

The changes in diff format:

diff gcc.mak.orig gcc.mak
24,25c24,25
< CXX=g++
< LINKER=g++ -shared
---
> CXX?=g++
> LINKER=$(CXX) -shared

diff gcc-shared.mak.orig gcc-shared.mak
24,25c24,25
< CXX=g++
< LINKER=g++ -shared
---
> CXX?=g++
> LINKER=$(CXX) -shared
",Bugs,closed,To Be Determined,regex,Boost 1.49.0,Problem,fixed,gcc makefile g++ path,