[Python-bugs-list] [ python-Bugs-437487 ] 2.1 build on Solaris fails if CC is set

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Bugs item #437487, was opened at 2001-06-29 15:42
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=437487&group_id=5470

Category: Build
Group: Platform-specific
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: A.M. Kuchling (akuchling)
Summary: 2.1 build on Solaris fails if CC is set

Initial Comment:
If you have CC set to "gcc", then the "setup.py" script
compiles
the extensions incorrectly (in particular, the "-fPIC"
on the compile is
not used):

   ...
   PYTHONPATH= ./python ./setup.py build
   running build
   running build_ext
   building 'struct' extension
   creating build
   creating build/temp.solaris-2.7-sun4u-2.1
   gcc -I. -I/extra/Python-2.1/./Include
-I/usr/local/include -IInclude/ -c
/extra/Python-2.1/Modules/structmodule.c -o
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
   creating build/lib.solaris-2.7-sun4u-2.1
   gcc -shared
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
-L/usr/local/lib -o
build/lib.solaris-2.7-sun4u-2.1/struct.so
   Text relocation remains                    
referenced
       against symbol          offset  in file
   <unknown>                           0x2094     
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
   <unknown>                           0x200c     
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
   <unknown>                           0x3398     
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
   <unknown>                           0x2098     
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
   <unknown>                           0x2070     
build/temp.solaris-2.7-sun4u-2.1/structmodule.o
<unknown>                           0x206c
    ....

If you want to compile code configured via "configure"
with the "gcc"
compiler and you have both the "gcc" and the Sun C
compiler installed
on your system, then you need to have the environment
variable
"CC" set to "gcc":
    CC=gcc

So people (like myself) have "CC=gcc" in their .profile
or equivalent
in .login, and have had that for years without thinking
about it.

If you don't have "CC=gcc" set in your environment,
then things
work fine:

    ...
    PYTHONPATH= ./python ./setup.py build
    running build
    running build_ext
    building 'struct' extension
    creating build
    creating build/temp.solaris-2.7-sun4u-2.1
    gcc -g -O2 -Wall -Wstrict-prototypes -fPIC -I.
-I/home/tflagg/projects/python/2.1sunos/Python-2.1/./Include
-I/usr/local/include -IInclude/ -c
/home/tflagg/projects/python/2.1sunos/Python-2.1/Modules/structmodule.c
-o build/temp.solaris-2.7-sun4u-2.1/structmodule.o

(In particular, the "-fPIC" flag needs to be there as
shown above.)

The problem lines in "setup.py" are:
    112         # When you run "make CC=altcc" or
something similar, you really want
    113         # those environment variables passed
into the setup.py phase.  Here's
    114         # a small set of useful ones.
    115         compiler = os.environ.get('CC')  
<----------
    116         linker_so = os.environ.get('LDSHARED')
    117         args = {}
    118         # unfortunately, distutils doesn't let
us provide separate C and C++
    119         # compilers
    120         if compiler is not None:  
<---------------
    121             args['compiler_so'] = compiler 
<---------

It's true the user may want to set
site-specific/user-specific
compiler options.  However, if "CC" is only "gcc" then
the user is
trying to communicate:

    - Use "gcc" rather than Sun's C compiler

They are NOT trying to communicate:

- Do not use any of the compiler flags for compiling
shared objects.

The reason this bug  Solaris-specific is because
Solaris
installations are the most likely to have a non-gcc
compiler installed, requiring the "CC=gcc" environment
variable set.

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