[En-Nut-Discussion] warning: assignment discards qualifiers from pointer target type

[José Vallet]

Hello all.

I have just bought an Ethernut 2.1 for a project and I am starting with
all the instalations and examples.

I installed the latest stuff that I found:
-WinAVR 20050214
-ethernut 3.9.8

Then I followed the instructions of the "Ethernut software Manual (June
2005)" and followed the "Quick Start With WinAVR"
-Installing Nut/OS at C:\ethernut-3.9.8
-Started Nut/OS configurator and choose ethernut21b.conf as the hardware
configuration file
-Edit->Settings and
   *Repository file: c:/ethernut-3.9.8/nut/conf/repository.nut
   *Source directory: c:/ethernut-3.9.8/nut  (I have the WinAVR stuff in
the path)
    Platform: avr-gcc
    Build directory: c:/ethernut-3.9.8/nutbld
    Install directory: c:/ethernut-3.9.8/nutbld/lib
   *Tools Path: c:/ethernut-3.9.8/nut/tools/win32;
   *Application Directory c:/ethernut-3.9.8/nutapp
   *Programmer: avr-uisp-stk500
-Tools-> check GCC for AVR
-Buld->Generate Build tree
-Buid->Build Nut/OS


And no problem until now. BUT, when I try to compile the httpd example I 
found 2 problems:
1- A "scary :-)" warning message:
"warning: assignment discards qualifiers from pointer target type".
I couldn't solve this one.

2-If I do "make clean", after it fails to compile. It seems that the 
"make clean" deletes the "urom.c" file among others. Then, when building 
the application again, the "make" cannot find the "crurom" application. 
I could solve this one by adding manually the 
"C:\ethernut-3.9.8\nut\tools\win32" folder to the path. But  there's 
something that I don't understand. In the configurator I set up the 
tools path to "c:/ethernut-3.9.8/nut/tools/win32;", and as said in the 
documentation, "The Configurator will add these entries to the PATH 
environment when running the compiler". So, it should be included when 
compiling, right?

What am I missing here?

Thanks in advance.
José

Here I put a  "command session" that might give more information.

*******
*******Before adding "C:\ethernut-3.9.8\nut\tools\win32" to the path
*******

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ ls
HTTPD.SRC  Makefile  httpd.prj  httpserv.c  sample  urom.c

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ make all
avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall
-Wstrict-prototypes -Wa,-ahlms=httpserv.lst -D__HARVARD_ARCH__
-DETHERNUT2 -Ic:/e
thernut-3.9.8/nutbld/include -Ic:/ethernut-3.9.8/nut/include  httpserv.c
-o httpserv.o
httpserv.c: In function `ShowSockets':
httpserv.c:311: warning: assignment discards qualifiers from pointer
target type
httpserv.c:314: warning: assignment discards qualifiers from pointer
target type
httpserv.c:317: warning: assignment discards qualifiers from pointer
target type
httpserv.c:320: warning: assignment discards qualifiers from pointer
target type
httpserv.c:323: warning: assignment discards qualifiers from pointer
target type
httpserv.c:326: warning: assignment discards qualifiers from pointer
target type
httpserv.c:329: warning: assignment discards qualifiers from pointer
target type
httpserv.c:332: warning: assignment discards qualifiers from pointer
target type
httpserv.c:335: warning: assignment discards qualifiers from pointer
target type
httpserv.c:338: warning: assignment discards qualifiers from pointer
target type
httpserv.c:341: warning: assignment discards qualifiers from pointer
target type
httpserv.c:344: warning: assignment discards qualifiers from pointer
target type
avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall
-Wstrict-prototypes -Wa,-ahlms=urom.lst -D__HARVARD_ARCH__ -DETHERNUT2
-Ic:/ether
nut-3.9.8/nutbld/include -Ic:/ethernut-3.9.8/nut/include  urom.c -o urom.o
avr-gcc httpserv.o urom.o -mmcu=atmega128
-Wl,--defsym=main=0,-Map=httpserv.map,--cref
-Lc:/ethernut-3.9.8/nutbld/lib  c:/ethernut-3.9.8/nutbld/lib/nu
tinit.o  -lnutnet -lnutpro -lnutfs -lnutos -lnutdev -lnutnet -lnutcrt -o
httpserv.elf
avr-objcopy -R .eeprom -O ihex httpserv.elf httpserv.hex
rm httpserv.elf

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ ls
HTTPD.SRC  Makefile  httpd.prj  httpserv.c  httpserv.hex  httpserv.lst
httpserv.map  httpserv.o  sample  urom.c  urom.lst  urom.o

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ make clean
rm -f httpserv.o urom.o
rm -f httpserv.hex
rm -f httpserv.eep
rm -f httpserv.obj
rm -f httpserv.map
rm -f httpserv.lst urom.lst
rm -f httpserv.bak urom.bak
rm -f httpserv.i urom.i
rm -f urom.c

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ ls
HTTPD.SRC  Makefile  httpd.prj  httpserv.c  sample

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ make all
avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall
-Wstrict-prototypes -Wa,-ahlms=httpserv.lst -D__HARVARD_ARCH__
-DETHERNUT2 -Ic:/e
thernut-3.9.8/nutbld/include -Ic:/ethernut-3.9.8/nut/include  httpserv.c
-o httpserv.o
httpserv.c: In function `ShowSockets':
httpserv.c:311: warning: assignment discards qualifiers from pointer
target type
httpserv.c:314: warning: assignment discards qualifiers from pointer
target type
httpserv.c:317: warning: assignment discards qualifiers from pointer
target type
httpserv.c:320: warning: assignment discards qualifiers from pointer
target type
httpserv.c:323: warning: assignment discards qualifiers from pointer
target type
httpserv.c:326: warning: assignment discards qualifiers from pointer
target type
httpserv.c:329: warning: assignment discards qualifiers from pointer
target type
httpserv.c:332: warning: assignment discards qualifiers from pointer
target type
httpserv.c:335: warning: assignment discards qualifiers from pointer
target type
httpserv.c:338: warning: assignment discards qualifiers from pointer
target type
httpserv.c:341: warning: assignment discards qualifiers from pointer
target type
httpserv.c:344: warning: assignment discards qualifiers from pointer
target type
crurom -r -ourom.c sample
make: crurom: Command not found
make: *** [urom.c] Error 127

*******
*******AFTER adding "C:\ethernut-3.9.8\nut\tools\win32" to the path
*******

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ make clean
rm -f httpserv.o urom.o
rm -f httpserv.hex
rm -f httpserv.eep
rm -f httpserv.obj
rm -f httpserv.map
rm -f httpserv.lst urom.lst
rm -f httpserv.bak urom.bak
rm -f httpserv.i urom.i
rm -f urom.c

jose at aut-090 /cygdrive/c/ethernut-3.9.8/nutapp/httpd
$ make all
avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall 
-Wstrict-prototypes -Wa,-ahlms=httpserv.lst -D__HARVARD_
ARCH__ -DETHERNUT2 -Ic:/ethernut-3.9.8/nutbld/include 
-Ic:/ethernut-3.9.8/nut/include  httpserv.c -o httpserv.o
httpserv.c: In function `ShowSockets':
httpserv.c:311: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:314: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:317: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:320: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:323: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:326: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:329: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:332: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:335: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:338: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:341: warning: assignment discards qualifiers from pointer 
target type
httpserv.c:344: warning: assignment discards qualifiers from pointer 
target type
crurom -r -ourom.c sample
avr-gcc -c -mmcu=atmega128 -Os -fno-delete-null-pointer-checks -Wall 
-Wstrict-prototypes -Wa,-ahlms=urom.lst -D__HARVARD_ARCH
__ -DETHERNUT2 -Ic:/ethernut-3.9.8/nutbld/include 
-Ic:/ethernut-3.9.8/nut/include  urom.c -o urom.o
avr-gcc httpserv.o urom.o -mmcu=atmega128 
-Wl,--defsym=main=0,-Map=httpserv.map,--cref 
-Lc:/ethernut-3.9.8/nutbld/lib  c:/eth
ernut-3.9.8/nutbld/lib/nutinit.o  -lnutnet -lnutpro -lnutfs -lnutos 
-lnutdev -lnutnet -lnutcrt -o httpserv.elf
avr-objcopy -R .eeprom -O ihex httpserv.elf httpserv.hex
rm httpserv.elf