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Altera_Forum's avatar
Altera_Forum
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20 years ago

how I "set the BUILD_CC environment variable "?

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!

9 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    ./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' rather than `unknown'
 #  because (1) that's what they normally are, and
 #  (2) the word "unknown" tends to confuse beginning users.
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    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's avatar
    Altera_Forum
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    20 years ago

    thank you hippo.

    Can you tell me how I compile ~/buildroot/package/ncurses?
  • Altera_Forum's avatar
    Altera_Forum
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    20 years ago

    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's avatar
    Altera_Forum
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    20 years ago

    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's avatar
    Altera_Forum
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    20 years ago

    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's avatar
    Altera_Forum
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    20 years ago

    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's avatar
    Altera_Forum
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    20 years ago

    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...)