Why gmake create two path environment variables

[freeman . liu]

Hi, Gurus,

I found an PATH environment variable
related issue with gmake.

In Windows/Dos, the env var is case
insensitive. On my system, the command "set path" give the following
result.

*******************************************************************************************************************
D:\tmp>set path
Path="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:\Symbian\
SITK\stat\bin;C:\Symbian\SITK;C:\Symbian\SITK\edgd\bin\;C:\Symbian\SITK\cbr;C:\S
ymbian\SITK\ucc\bin;C:\Symbian\SITK\ucc\SyncService\bin;C:\Symbian\SITK\ucc\Test
DriverService\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:\Progra
m Files\Novell\ZENworks\;C:\Program
Files\QuickTime\QTSystem\;C:\APPS\Nokia\Carb
ide.c++ v1.3\x86Build\Symbian_Tools\Command_Line_Tools;C:\Apps\Perforce;C:\Apps\
Perforce\;C:\Program Files\Common Files\Symbian\Tools;c:\apps\Coverity\bin;C:\Ap
ps\Coverity\bin;C:\Apps\ARM\Utilities\FLEXlm\9.2\release\win_32-pentium;C:\Progr
am Files\Rational\TestRealTime\bin\intel\win32;C:\Program
Files\Rational\common;
C:\Program Files\Vim\vim71\;\epoc32\tools\perllib;\test\common\runtest;C:\Symbia
n\P4\EPOC\DV4\personal\2008\kunxu\test\common\runtest;C:\Symbian\9.5\epoc32\tool
s\perllib;C:\ECloud\i686_win32\bin;
PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH
*******************************************************************************************************************

While with a makefile like this,
all:
        set
Path

I get this result.
*******************************************************************************************************************
set Path
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;
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
*******************************************************************************************************************

One PATH and one Path. My question is
why two paths ? What is the difference betwen the normal shell 
and the one in which gmake runs commands
?

Actually, when I use some perl script
inside Makefiles, they can only change one the path variables
by setting $ENV{'Path'} or $ENV{'PATH'},
which make Path and PATH different and this will
prevent locating the correct executable.

Thank you,

Freeman Liu
Senior Software Engineer, Product Creation Tools
Symbian Software Ltd.
Telephone +86 (010) 58848074
Mobile 13911352150
perl -e "s//reverse achilles/e/y/ucslelctohaysi/inferentialism//print"

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