Re: Why gmake create two path environment variables

[freeman . liu]

Hi, Eli,

Thanks for your answer !


>> 
>> Is there any real-life situation where this dual Path/PATH arrangement
>> causes trouble?  If so, please describe that situation in
detail.

Yes. One analysing tool need to change the path so
that I can get invoked before
the cmd of the same name. It is in written in perl
and it works fine in dos shell.
But it refuse to work when the exact same command
is issue from within gmake makefile.
nmake does not have that problem. 

I have minimize the detail way to reproduce the issue
here.

This is a question about how to set
path environment variable in windows from with in a gmake makefile. I use
active perl but I dont think this matters.

The perl script that cause problem is
copied here:

*******************************************************************************************
$ENV{'Path'}="ABC" .  ";"
. $ENV{'Path'};
system("set path") == 0 or
die "fail : $?: $!:"
*******************************************************************************************

And when it is executed, the output
is this:
*******************************************************************************************
PATH=ABC;C:\Program Files\CSL Arm Toolchain\bin;C:\Perl10\site\bin;C:\Perl10\bin
;C:\Apps\ARM\RVCT\Programs\2.2\349\win_32-pentium;C:\Apps\ARM\bin\win_32-pentium
;C:\Perl\bin;N:\epoc32\tools;N:\epoc32\gcc\bin;N:\epoc32\gcc_mingw\bin;C:\Symbia
n\SITK\stat\bin;C:\Symbian\SITK;C:\Symbian\SITK\edgd\bin\;C:\Symbian\SITK\cbr;C:
\Symbian\SITK\ucc\bin;C:\Symbian\SITK\ucc\SyncService\bin;C:\Symbian\SITK\ucc\Te
stDriverService\bin;C:\Symbian\SITK\sqlite-db-creator;C:\Symbian\SITK\testdriver
;C:\Symbian\SITK\imgcheck;C:\Symbian\SITK\SystemModelGenerator;;C:\Apps\Reltools
;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\i386;c:\Prog
ram Files\Novell\ZENworks\;C:\Program
Files\QuickTime\QTSystem\;C:\APPS\Nokia\Ca
rbide.c++ v1.3\x86Build\Symbian_Tools\Command_Line_Tools;C:\Apps\Perforce;C:\App
s\Perforce\;C:\Program Files\Common
Files\Symbian\Tools;c:\apps\Coverity\bin;C:\
Apps\Coverity\bin;C:\Apps\ARM\Utilities\FLEXlm\9.2\release\win_32-pentium;C:\Pro
gram Files\Rational\TestRealTime\bin\intel\win32;C:\Program
Files\Rational\commo
n;C:\Program Files\Vim\vim71\;\epoc32\tools\perllib;\test\common\runtest;C:\Symb
ian\P4\EPOC\DV4\personal\2008\kunxu\test\common\runtest;C:\Symbian\9.5\epoc32\to
ols\perllib;C:\ECloud\i686_win32\bin;
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
*******************************************************************************************

But if it is execuated insdie gmake
makefile like this;
*******************************************************************************************
all:
        perl
t.pl
*******************************************************************************************

The output of make is like this:
*******************************************************************************************
perl t.pl
Path=ABC;c:\symbian\9.5\epoc32\tools\;c:\symbian\9.5\epoc32\gcc\bin\;C:\Program
Files\CSL Arm Toolchain\bin;C:\Perl10\site\bin;C:\Perl10\bin;C:\Apps\ARM\RVCT\Pr
ograms\2.2\349\win_32-pentium;C:\Apps\ARM\bin\win_32-pentium;C:\Perl\bin;N:\epoc
32\tools;N:\epoc32\gcc\bin;N:\epoc32\gcc_mingw\bin;C:\Symbian\SITK\stat\bin;C:\S
ymbian\SITK;C:\Symbian\SITK\edgd\bin\;C:\Symbian\SITK\cbr;C:\Symbian\SITK\ucc\bi
n;C:\Symbian\SITK\ucc\SyncService\bin;C:\Symbian\SITK\ucc\TestDriverService\bin;
C:\Symbian\SITK\sqlite-db-creator;C:\Symbian\SITK\testdriver;C:\Symbian\SITK\img
check;C:\Symbian\SITK\SystemModelGenerator;;C:\Apps\Reltools;C:\WINDOWS\system32
;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\i386;c:\Program
Files\Novell\ZEN
works\;C:\Program Files\QuickTime\QTSystem\;C:\APPS\Nokia\Carbide.c++
v1.3\x86Bu
ild\Symbian_Tools\Command_Line_Tools;C:\Apps\Perforce;C:\Apps\Perforce\;C:\Progr
am Files\Common Files\Symbian\Tools;c:\apps\Coverity\bin;C:\Apps\Coverity\bin;C:
\Apps\ARM\Utilities\FLEXlm\9.2\release\win_32-pentium;C:\Program
Files\Rational\
TestRealTime\bin\intel\win32;C:\Program
Files\Rational\common;C:\Program Files\V
im\vim71\;\epoc32\tools\perllib;\test\common\runtest;C:\Symbian\P4\EPOC\DV4\pers
onal\2008\kunxu\test\common\runtest;C:\Symbian\9.5\epoc32\tools\perllib;C:\EClou
d\i686_win32\bin;
Path=c:\symbian\9.5\epoc32\tools\;c:\symbian\9.5\epoc32\gcc\bin\;C:\Program
File
s\CSL Arm Toolchain\bin;C:\Perl10\site\bin;C:\Perl10\bin;C:\Apps\ARM\RVCT\Progra
ms\2.2\349\win_32-pentium;C:\Apps\ARM\bin\win_32-pentium;C:\Perl\bin;N:\epoc32\t
ools;N:\epoc32\gcc\bin;N:\epoc32\gcc_mingw\bin;C:\Symbian\SITK\stat\bin;C:\Symbi
an\SITK;C:\Symbian\SITK\edgd\bin\;C:\Symbian\SITK\cbr;C:\Symbian\SITK\ucc\bin;C:
\Symbian\SITK\ucc\SyncService\bin;C:\Symbian\SITK\ucc\TestDriverService\bin;C:\S
ymbian\SITK\sqlite-db-creator;C:\Symbian\SITK\testdriver;C:\Symbian\SITK\imgchec
k;C:\Symbian\SITK\SystemModelGenerator;;C:\Apps\Reltools;C:\WINDOWS\system32;C:\
WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\i386;c:\Program
Files\Novell\ZENwork
s\;C:\Program Files\QuickTime\QTSystem\;C:\APPS\Nokia\Carbide.c++
v1.3\x86Build\
Symbian_Tools\Command_Line_Tools;C:\Apps\Perforce;C:\Apps\Perforce\;C:\Program
F
iles\Common Files\Symbian\Tools;c:\apps\Coverity\bin;C:\Apps\Coverity\bin;C:\App
s\ARM\Utilities\FLEXlm\9.2\release\win_32-pentium;C:\Program
Files\Rational\Test
RealTime\bin\intel\win32;C:\Program
Files\Rational\common;C:\Program Files\Vim\v
im71\;\epoc32\tools\perllib;\test\common\runtest;C:\Symbian\P4\EPOC\DV4\personal
\2008\kunxu\test\common\runtest;C:\Symbian\9.5\epoc32\tools\perllib;C:\ECloud\i6
86_win32\bin;
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
*******************************************************************************************
There are one PATH modified and one
Path untouched. How can I change both ?
And why there are two ?

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