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From: Tom Schneider
Subject: gpc-20000707 djgpp native compilation
Date: 13 Jul 2000, 11:29:14

Dear Maurice:

I noticed your complex expression:

> The relevant part of the output is (with some air interspersed)
> 
cd p/rts && c:/djgpp/bin/make.exe CC="`echo c:/djgpp/gnu/gcc-2.952/build.djg/gcc
/xgcc -Bc:/djgpp/gnu/gcc-2.952/build.djg/gcc/ -Bc:/djgpp/i586-pc-msdosdjgpp/bin/
-Ic:/djgpp/i586-pc-msdosdjgpp/include' ' | sed -e 's,-B\([^/][^:]\),-B../../\1,
g;s,^\([^/][^:]*\),../../\1,'`" PC="`echo ./xgpc -B./' ' | sed -e 's,-B\([^/][^:
]\),-B../../\1,g;s,^\([^/][^:]*\),../../\1,'`" SHELL="c:/djgpp/bin/bash.exe" CFL
AGS="-O2" AR="ar" AR_FLAGS="rc" RANLIB="ranlib" RANLIB_TEST="[ -f ranlib ] || (
[ "i586-pc-msdosdjgpp" = "i586-pc-msdosdjgpp" ] && [ -f /usr/bin/ranlib -o -f /b
in/ranlib ] )" RTSFLAGS="" DESTDIR="../.." all

Even with the space it is hard to get through!

So I thought of mentioning a trick I use:  the backslash
to break the lines into logical units:

cd p/rts && c:/djgpp/bin/make.exe CC="`echo c:/djgpp/gnu/gcc-2.952/build.djg/gcc
/xgcc -Bc:/djgpp/gnu/gcc-2.952/build.djg/gcc/ -Bc:/djgpp/i586-pc-msdosdjgpp/bin/
-Ic:/djgpp/i586-pc-msdosdjgpp/include' ' |\
cat |\
 sed -e 's,-B\([^/][^:]\),-B../../\1,
g;s,^\([^/][^:]*\),../../\1,'`" PC="`echo ./xgpc -B./' ' |\
cat |\
 sed -e 's,-B\([^/][^: ]\),-B../../\1,g;s,^\([^/][^:]*\),../../\1,'`" SHELL="c:/djgpp/bin/bash.exe" CFLAGS="-O2" AR="ar" AR_FLAGS="rc" RANLIB="ranlib" RANLIB_TEST="[ -f ranlib ] || ( [ "i586-pc-msdosdjgpp" = "i586-pc-msdosdjgpp" ] && [ -f /usr/bin/ranlib -o -f /b
in/ranlib ] )" RTSFLAGS="" DESTDIR="../.." all

Well, that's not much better (yet) but the idea is to do things like this:

cat my.file |\
tr -d 0-9 |\
sort |\
uniq |\
sed -e "s/this/that/g" |\
cat > my.result

The nice thing about this method is that one can easily see the steps, and it
is easy to rearrange and modify.  (Of course one must not have
any spaces after the backslash!)

Regards,

Tom

  Dr. Thomas D. Schneider
  National Cancer Institute
  Laboratory of Experimental and Computational Biology
  Frederick, Maryland  21702-1201
  toms@ncifcrf.gov
  permanent email: toms@alum.mit.edu
  http://www.lecb.ncifcrf.gov/~toms/

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