how I "set the BUILD_CC environment variable "?

Altera_Forum · ‎03-08-2006

hi all:

I am porting ncurses-5.5 to nios2 uclinux now.

Frist I edit configure.sub

add " | nios2 " in the "case $basic_machine in"

then I run:

./configure --build=nios2 --with-build-cc=nios2-linux-uclibc-gcc

but I check configure information and I find the message as bollow:

checking whether we are cross compiling... no

I checked the makefile ,I find the cc setting still use gcc, not nios2-linux-uclinbc-gcc

CC = gcc

CPP = gcc -E

CFLAGS = -O2

I read the install of ncures5.5. I got some information about crosscompile as bellow:

BUILDING NCURSES WITH A CROSS-COMPILER

Ncurses can be built with a cross-compiler. Some parts must be built

with the host's compiler since they are used for building programs

(e.g., ncurses/make_hash and ncurses/make_keys) that generate tables

that are compiled into the ncurses library. The essential thing to do

is set the BUILD_CC environment variable to your host's compiler, and

run the configure script configuring for the cross-compiler.

The configure options --with-build-cc, etc., are provided to make this

simpler. Since make_hash and make_keys use only ANSI C features, it

is normally not necessary to provide the other options such as

--with-build-libs, but they are provided for completeness.

Who can tell me how I "set the BUILD_CC environment variable to my host's compiler" ?

Thank a lot!

Altera_Forum · ‎03-08-2006

./configure --host=nios2-linux-uclibc- --with-build-cc=gcc --disable-shared ......

about config.sub, check ~/download/uClinux-dist.diff on how to add $basic_machine, eg wget

Index: user/wget/config.sub
===================================================================
--- user/wget/config.sub    (revision 1)
+++ user/wget/config.sub    (revision 3)
@@ -274,6 +274,11 @@
  m88110 | m6800 | m683?2 | m68360 | m5200 | v70 | w65 | z8k)
  ;;
 
+    nios2 | nios2-* | nios2 | nios2-*)
+  basic_machine=nios2-altera
+  os=-linux
+    ;;
+
 #  We use `pc&#39; rather than `unknown&#39;
 #  because (1) that&#39;s what they normally are, and
 #  (2) the word "unknown" tends to confuse beginning users.

Altera_Forum · ‎03-09-2006

hi hippo:

Thanks for you reply.

Frist I have successed make ncurese by you guide.

Then I must cross compile cdk(curses d k).It is a devlope tool for ncurses.

I still edit configure.sub and use configure option as your post.

but not select crosscompile option in configure process.

[alex@localhost cdk-5.0-20060220]$ ./configure --host=nios2-linux-uclibc --with-build-cc=gcc --disable-shared

loading cache ./config.cache

checking for X... (cached) libraries /usr/X11R6/lib, headers /usr/X11R6/include

checking host system type... nios2-altera-linux-gnu

(cached) Configuring for linux-gnu

checking for package version... 5.0

checking for package patch date... 20060220

checking for gcc... (cached) gcc

checking whether the C compiler (gcc ) works... yes

checking whether the C compiler (gcc ) is a cross-compiler... no

checking whether we are using GNU C... (cached) yes

I try another ./configure option, for example:

[alex@localhost cdk-5.0-20060220]$ ./configure --build=nios2 --host--nios2-linux-uclibc --with-build-cc=gcc --disable-shared

[alex@localhost cdk-5.0-20060220]$ ./configure --host--nios2-linux-uclibc --with-build-cc=nios2-linux-uclibc-gcc --disable-shared

etc....

but I still fail.

Please help me.

If I make success, I will test the ncurses in my dvb. Then post porting method

to forum.The ncurses is a very helpful terminal tool for us.It can make tab,menu,

....in a terminal like a Kernel make menuconfig windows.

Altera_Forum · ‎03-09-2006

take a look at the config usage in ~/buildroot/package/ncurses/ncurses.mk

I didn't know cdk. sorry.

Altera_Forum · ‎03-09-2006

thank you hippo.

Can you tell me how I compile ~/buildroot/package/ncurses?

Altera_Forum · ‎03-09-2006

change "--with-shared" to "--disable-shared" in the configure command of the ~/buildroot/package/ncurses/ncurses.mk . You will need to removed the so (shared object) building.

The uClinux-dist (-test) has ncurses lib too. You'd better use this one, which is ported to uClinux. Check the library selection.

As a general rule, when you need lib or apps, check the uClinux-dist first.

Most lib or apps ports in buildroot are shared objects, which is not supported in current nios2.

You have to modify the mk files to remove shared.

Altera_Forum · ‎03-09-2006

hi:

I don't find ncurses lib in uClinux-dist-test.

I just find nessus app in /user. Can you tell where id the ncurses lib?

Thank you

Altera_Forum · ‎03-09-2006

You are right. It was missing in uClinux-dist.

So try buildroot's,

cd ~/buildroot
make menuconfig

in Package Selection for the target-->[ *] ncurses , to select the package.

You have to edit mk file, in line 64,

change "--with-shared" to "--disable-shared" of the configure command of the ~/buildroot/package/ncurses/ncurses.mk

Then make. It will fail on shared object. But the static lib and header are ready, and you can try them.

Altera_Forum · ‎03-10-2006

hi hippo:

1. I make ncurses ~/buildroot/package/ncurses is oK.

2.as your guide :./configure --host=nios2-linux-uclibc- --with-build-cc=gcc --disable-shared ......

in sometimes maybe not correct.

sometimes must change "--host=nios2-linux-uclibc-" to "--host=nios2-linux-uclibc".

for example in ncurses ./confing, because "-" will be added by configure again.if you still use "--host=nios2-linux-uclibc-" ,it will make mistake.

Altera_Forum · ‎03-10-2006

Hi Alex,

You are right. Never add the last "-", just use "nios2-linux-uclibc" for --host= or --target= .

Thanks.

(I am lost, because I did not use configure for a while. I'm no more young...)