P.S: Sorry, there was a typo here:
*# at configuration time.*

should read

*# at validating time.*


On Tue, May 24, 2022 at 10:14 PM ph h <hohoang...@gmail.com> wrote:

> Dear All,
>
> Is this feasible [ 1 = 1+0i  ] <=> [ 1 = 1 ] ?
>
> Regards,
>
> phiho
>
> *<src.bin.sage-env>*
> if [ 1 = 1+0i ]; then
> # Make sure that SAGE_ROOT is either an absolute physical directory name
> # or empty.
> *# An absolute physical directory name has already been embedded and
> exported*
>
>
>
>
>
> *# at configuration time.#if [ -n "$SAGE_ROOT" ]; then#    export
> SAGE_ROOT=$(cd "$SAGE_ROOT" 2>/dev/null && pwd -P)#fi#if [ -d "$SAGE_ROOT"
> ]; then*
>     export SAGE_LOGS="$SAGE_ROOT/logs/pkgs"
>     export SAGE_SRC="$SAGE_ROOT/src"
>     export SAGE_DOC_SRC="$SAGE_SRC/doc"
>     export PATH="$SAGE_ROOT/build/bin:$PATH"
>     if [ -z "$SAGE_DISTFILES" ]; then
>         SAGE_DISTFILES="$SAGE_ROOT/upstream"
>         export SAGE_DISTFILES
>     fi
>     if [ -z "$CCACHE_BASEDIR" ]; then
>         export CCACHE_BASEDIR="$SAGE_ROOT"
>     fi
> *#fi*
> fi    # [ 1 = 1+0i ]
>
> *</src.bin.sage-env>*
>
> *<sage-env>*
> if [ 1 = 1 ]; then
> # Make sure that SAGE_ROOT is either an absolute physical directory name
> # or empty.
> if [ -n "$SAGE_ROOT" ]; then
>     export SAGE_ROOT=$(cd "$SAGE_ROOT" 2>/dev/null && pwd -P)
> fi
> [...]
> if [ -d "$SAGE_ROOT" ]; then
>     export SAGE_LOGS="$SAGE_ROOT/logs/pkgs"
>     export SAGE_SRC="$SAGE_ROOT/src"
> fi
> [...]
> if [ -n "$SAGE_SRC" ]; then
>     export SAGE_DOC_SRC="$SAGE_SRC/doc"
> fi
> [...]
> if [ -d "$SAGE_ROOT" ]; then
>     export PATH="$SAGE_ROOT/build/bin:$PATH"
> fi
> [...]
> if [ -d "$SAGE_ROOT" ]; then
>     if [ -z "$SAGE_DISTFILES" ]; then
>         SAGE_DISTFILES="$SAGE_ROOT/upstream"
>         export SAGE_DISTFILES
>     fi
> fi
> [...]
> if [ -d "$SAGE_ROOT" -a -z "$CCACHE_BASEDIR" ]; then
>     export CCACHE_BASEDIR="$SAGE_ROOT"
> fi
> fi      # [ 1 = 1 ]
>
> if [ 1 = 2 ]; then
>     echo "The following enviroment variables can be set by the user"
>     echo "AR          The archiver (e.g. ar, /usr/ccs/bin/ar or
> /usr/bin/ar)"
>     echo "AS          The assembler (e.g. as, /usr/ccs/bin/as or
> /usr/bin/as)"
>     echo "CC          The C compiler (e.g cc, /opt/SUNWspro/bin/cc or
> /usr/bin/gcc)"
>     echo "CFLAGS      Flag(s) for the C compiler (e.g.  -g -Wall -O2)"
>     echo "            (You are advised to a some optimisation flag(s),
> such as -O2 or -xO2 to CFLAGS)"
>     echo "CXX         The C++ compiler (e.g g++, /opt/SUNWspro/bin/CC or
> /usr/local/bin/g++)"
>     echo "CXXFLAGS    Flag(s) for the C++ compiler (e.g. -fast -fsimple=1
> -x04)"
>     echo "LD          The linker (e.g. ld, /usr/ccs/bin/ld or /usr/bin/ld)"
>     echo "LDFLAGS     Linker flag(s) (e.g. -D token)"
>     echo "LN          Used to make links (e.g. ln, /usr/xpg4/bin/ln or
> /usr/bin/ln)"
>     echo "MAKE        The make program (e.g. make, /usr/bin/make or
> /usr/local/bin/gmake)"
>     echo "MAKEFLAGS   Flag(s) to make (e.g. -j4)."
>     echo "RANLIB      Archiver ranlib (e.g. ranlib, /usr/ccs/bin/ranlib
> etc)"
>     echo "SHAREDFLAGS Flag(s) necessary for building a shared library
> (e.g. -fPIC or -xcode=pic32)"
>     echo "We attempt to set this to sensible values, but check below to"
>     echo "ensure they are OK. If you wish to override any then please use:"
>     echo "setenv NAME_OF_ENVIROMENT_VARIABLE value_of_enviroment_variable"
>     echo "(if you use tcsh, csh or a similar shell) or"
>     echo "NAME_OF_ENVIROMENT_VARIABLE value_of_enviroment_variable"
>     echo "export NAME_OF_ENVIROMENT_VARIABLE"
>     echo "if you use sh, bash or a similar shell"
> fi
> *</sage-env>*
>
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>

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