Re: [Boost-bugs] [Boost C++ Libraries] #6887: Hardcoded path to g++ in gcc.mak and gcc-shared.mak for regex

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #6887: Hardcoded path to g++ in gcc.mak and gcc-shared.mak for regex
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-05-10 13:26:19


#6887: Hardcoded path to g++ in gcc.mak and gcc-shared.mak for regex
------------------------------------------------------------+---------------
  Reporter: Morten Rasmussen <mortenrasmussen@…> | Owner: johnmaddock
      Type: Bugs | Status: new
 Milestone: To Be Determined | Component: regex
   Version: Boost 1.49.0 | Severity: Problem
Resolution: | Keywords: gcc makefile g++ path
------------------------------------------------------------+---------------

Comment (by Morten Rasmussen <mortenrasmussen@…>):

 (Sorry for lousy formatting - read below instead)


 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
 }}}

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6887#comment:1>
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