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[PATCH] scripts: support building with the LSB wrappers


# HG changeset patch
# User Michael Hope <michael.hope@linaro.org>
# Date 1322438185 -46800
# Branch lsb
# Node ID edadd06cb17fd3a45501afe22ae39a76f4a76fa2
# Parent  49af7802dcd538ec3cb64337030b03ac2c6344d2
scripts: support building with the LSB wrappers

If set, look for 'lsbcc' instead of 'gcc' and 'lsbc++ instead of g++
and use them when building.

The Linux Standard Base defines a set of libraries and APIs that are
implemented by most distros.  If you build against these APIs then in
theory the program can run on any LSB distro instead of just the
host.

LSB provide a compiler wrapper for the host C and C++ compilers called
'lsbcc' and 'lsbc++'.  The wrapper checks the executable name to figure
out if you're calling the C or C++ compiler so you have to call these
names exactly.

Caveats: You need a 4.1 or 4.2 compiler to build.  Various parts of
the toolchain don't compile LSB 3.0+ header files.  Some parts
accidentally use the host include files.  A patch that works around
these is at:
 http://people.linaro.org/~michaelh/keep/00-crosstool-lsb-hacks.patch

Nits: I'm abusing the case statement to do an AND but it makes the
default value cleaner.

Signed-off-by: Michael Hope <michael.hope@linaro.org>

diff -r 49af7802dcd5 -r edadd06cb17f config/toolchain.in
--- a/config/toolchain.in	Tue Nov 22 10:08:10 2011 +0100
+++ b/config/toolchain.in	Mon Nov 28 12:56:25 2011 +1300
@@ -247,6 +247,18 @@
       for that by checking the tools without the suffix in case it can
       not find some of the tool.
 
+config BUILD_USE_LSBCC
+    bool
+    prompt "|  Build using the Linux Standard Base compilers"
+    help
+      Set to use the LSB C and C++ compiler wrappers lsbcc and
+      lsbc++ instead of gcc and g++.
+
+      LSB applications are more portable and should run on any LSB
+      compliant Linux based operating system.  Note that building
+      against a LSB 3.0 system may require a pre-4.3 version of GCC
+      and local patches to the LSB build tree.
+
 if CANADIAN
 
 comment "Host system"
diff -r 49af7802dcd5 -r edadd06cb17f scripts/crosstool-NG.sh.in
--- a/scripts/crosstool-NG.sh.in	Tue Nov 22 10:08:10 2011 +0100
+++ b/scripts/crosstool-NG.sh.in	Mon Nov 28 12:56:25 2011 +1300
@@ -390,6 +390,13 @@
         fi
 
         for tool in ar as dlltool gcc g++ gcj gnatbind gnatmake ld nm objcopy objdump ranlib strip windres; do
+            # Re-map GCC and G++ to the corresponding LSB names
+            case "${CT_BUILD_USE_LSBCC},${m},${tool}" in
+                y,BUILD,gcc)  target="lsbcc";;
+                y,BUILD,g++)  target="lsbc++";;
+                *)            target="${tool}";;
+            esac
+
             # First try with prefix + suffix
             # Then try with prefix only
             # Then try with suffix only, but only for BUILD, and HOST iff REAL_BUILD == REAL_HOST
@@ -397,17 +404,17 @@
             # This is needed, because some tools have a prefix and
             # a suffix (eg. gcc), while others may have only one,
             # or even none (eg. binutils)
-            where=$(CT_Which "${t}${tool}${!s}")
-            [ -z "${where}" ] && where=$(CT_Which "${t}${tool}")
+            where=$(CT_Which "${t}${target}${!s}")
+            [ -z "${where}" ] && where=$(CT_Which "${t}${target}")
             if [    -z "${where}"                         \
                  -a \(    "${m}" = "BUILD"                \
                        -o "${CT_REAL_BUILD}" = "${!r}" \) ]; then
-                where=$(CT_Which "${tool}${!s}")
+                where=$(CT_Which "${target}${!s}")
             fi
             if [ -z "${where}"                            \
                  -a \(    "${m}" = "BUILD"                \
                        -o "${CT_REAL_BUILD}" = "${!r}" \) ]; then
-                where=$(CT_Which "${tool}")
+                where=$(CT_Which "${target}")
             fi
 
             # Not all tools are available for all platforms, but some are really,

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