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1) CC="gcc -B/usr/bin/", This forces gcc to prefer the linker from the host in /usr/bin. This is necessary on some hosts where the new ld built here is not compatible with the host's gcc. (boldly copied from the LFS 6.3, 5.3. Binutils-2.17 - Pass 1 page....).
and
2) ../binutils-2.17/configure --prefix=/tools --disable-nls --disable-werror, which is the configure command (with 3 options).
you can omit env and the result is the same: change or create an enviromental variable which will be assigned for the duration of the script or command. See man env for details.
The equivalent would have been to use "export CC=...", followed by the configure command?
No. Not export, but env. You are right, if using export you permanently set an environment variable until you close the shell or issue an unset command. Instead, using env or the syntax
Code:
NAME=VALUE [ COMMAND [ARG] ... ]
you can set the value of NAME just for the execution of the command.
Just to confirm: you can set the value of NAME just for the execution of the command. is correct.
I'm not sure if you are trying to set up LFS, but take a look at the chapter that follows binutils (GCC-4.1.2 - Pass 1), it shows that CC='.....' is set again.
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