RMS:

Use pc instead of unknown, for pc clones.
Use -linux-gnu for Linux-based GNU systems.

diff --git a/config.sub b/config.sub
index d86a27e..9cd9101 100755 (executable)
--- a/config.sub
+++ b/config.sub
@@ -41,6 +41,8 @@
 # The goal of this file is to map all the various variations of a given
 # machine specification into a single specification in the form:
 #      CPU_TYPE-MANUFACTURER-OPERATING_SYSTEM
+# or in some cases, the newer four-part form:
+#      CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
 # It is wrong to echo any other type of specification.
 
 if [ x$1 = x ]
@@ -62,11 +64,21 @@ case $1 in
        ;;
 esac
 
-# Separate what the user gave into CPU-COMPANY and OS (if any).
-basic_machine=`echo $1 | sed 's/-[^-]*$//'`
-if [ $basic_machine != $1 ]
-then os=`echo $1 | sed 's/.*-/-/'`
-else os=; fi
+# Separate what the user gave into CPU-COMPANY and OS or KERNEL-OS (if any).
+# Here we must recognize all the valid KERNEL-OS combinations.
+maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
+case $maybe_os in
+  linux-gnu*)
+    os=-$maybe_os
+    basic_machine=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\1/'`
+    ;;
+  *)
+    basic_machine=`echo $1 | sed 's/-[^-]*$//'`
+    if [ $basic_machine != $1 ]
+    then os=`echo $1 | sed 's/.*-/-/'`
+    else os=; fi
+    ;;
+esac
 
 ### Let's recognize common machines as not being operating systems so
 ### that things like config.sub decstation-3100 work.  We also
@@ -91,33 +103,33 @@ case $os in
                ;;
        -sco5)
                os=sco3.2v5
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -sco4)
                os=-sco3.2v4
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -sco3.2.[4-9]*)
                os=`echo $os | sed -e 's/sco3.2./sco3.2v/'`
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -sco3.2v[4-9]*)
                # Don't forget version if it is 3.2v4 or newer.
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -sco*)
                os=-sco3.2v2
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -isc)
                os=-isc2.2
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -clix*)
                basic_machine=clipper-intergraph
                ;;
        -isc*)
-               basic_machine=`echo $1 | sed -e 's/86-.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86-.*/86-pc/'`
                ;;
        -lynx*)
                os=-lynxos
@@ -137,7 +149,7 @@ esac
 case $basic_machine in
        # Recognize the basic CPU types without company name.
        # Some are omitted here because they have special meanings below.
-       tahoe | i[3456]86 | i860 | m68k | m68000 | m88k | ns32k | arm \
+       tahoe | i860 | m68k | m68000 | m88k | ns32k | arm \
                | arme[lb] | pyramid \
                | tron | a29k | 580 | i960 | h8300 | hppa1.0 | hppa1.1 \
                | alpha | we32k | ns16k | clipper | i370 | sh \
@@ -146,6 +158,12 @@ case $basic_machine in
                | sparc | sparclet | sparclite | sparc64)
                basic_machine=$basic_machine-unknown
                ;;
+       # We use `pc' rather than `unknown'
+       # because (1) that's what they normally are, and
+       # (2) the word "unknown" tends to confuse beginning users.
+       i[3456]86)
+         basic_machine=$basic_machine-pc
+         ;;
        # Object if more than one company name word.
        *-*-*)
                echo Invalid configuration \`$1\': machine \`$basic_machine\' not recognized 1>&2
@@ -325,19 +343,19 @@ case $basic_machine in
                ;;
 # I'm not sure what "Sysv32" means.  Should this be sysv3.2?
        i[3456]86v32)
-               basic_machine=`echo $1 | sed -e 's/86.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86.*/86-pc/'`
                os=-sysv32
                ;;
        i[3456]86v4*)
-               basic_machine=`echo $1 | sed -e 's/86.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86.*/86-pc/'`
                os=-sysv4
                ;;
        i[3456]86v)
-               basic_machine=`echo $1 | sed -e 's/86.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86.*/86-pc/'`
                os=-sysv
                ;;
        i[3456]86sol2)
-               basic_machine=`echo $1 | sed -e 's/86.*/86-unknown/'`
+               basic_machine=`echo $1 | sed -e 's/86.*/86-pc/'`
                os=-solaris2
                ;;
        iris | iris4d)
@@ -635,6 +653,8 @@ esac
 if [ x"$os" != x"" ]
 then
 case $os in
+        # First match some system type aliases
+        # that might get confused with valid system types.
        # -solaris* is a basic system type, with this one exception.
        -solaris1 | -solaris1.*)
                os=`echo $os | sed -e 's|solaris1|sunos4|'`
@@ -646,7 +666,7 @@ case $os in
                os=-sysv4
                ;;
        -gnu/linux*)
-               os=`echo $os | sed -e 's|gnu/linux|linux|'`
+               os=`echo $os | sed -e 's|gnu/linux|linux-gnu|'`
                ;;
        # First accept the basic system types.
        # The portable systems comes first.
@@ -657,14 +677,18 @@ case $os in
              | -hpux* | -unos* | -osf* | -luna* | -dgux* | -solaris* | -sym* \
              | -amigados* | -msdos* | -newsos* | -unicos* | -aof* | -aos* \
              | -nindy* | -vxworks* | -ebmon* | -hms* | -mvs* | -clix* \
-             | -riscos* | -linux* | -uniplus* | -iris* | -rtu* | -xenix* \
+             | -riscos* | -uniplus* | -iris* | -rtu* | -xenix* \
              | -hiux* | -386bsd* | -netbsd* | -freebsd* | -riscix* \
              | -lynxos* | -bosx* | -nextstep* | -cxux* | -aout* | -elf* \
              | -ptx* | -coff* | -ecoff* | -winnt* | -domain* | -vsta* \
              | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
-             | -cygwin32* | -pe* | -psos* | -moss* | -proelf* | -rtems*)
+             | -cygwin32* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
+             | -linux-gnu*)
        # Remember, each alternative MUST END IN *, to match a version number.
                ;;
+       -linux*)
+               os=`echo $os | sed -e 's|linux|linux-gnu|'`
+               ;;
        -sunos5*)
                os=`echo $os | sed -e 's|sunos5|solaris2|'`
                ;;