[PATCH v3 modular 2/3] build.sh: support CC, CPP, CPPFLAGS and CFLAGS

[Gaetan Nadon]

There is a requirement for some build environment to set CC
to something other than the Autoconf default.

There is already a variable CONFCFLAGS in place that can handle C flags,
however it was more a side-effect of adding -g option rather than
a comprehensive support for C flags.

The user interface for build.sh should closely follow the Autoconf one.
Rather than inventing new variable names, let's use the ones
Autoconf uses. The user will not have to learn two interfaces
and do the mental mapping.

Reviewed-by: Trevor Woerner <twoerner at gmail.com>
Signed-off-by: Gaetan Nadon <memsize at videotron.ca>
---

	Third edition: change quoting for CC/CFLAGS/CPP/CPPFLAGS/LDFLAGS

 build.sh |   16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diff --git a/build.sh b/build.sh
index 075e9f4..33120e0 100755
--- a/build.sh
+++ b/build.sh
@@ -15,6 +15,13 @@ global environment variables you may set to replace default functionality:
             (default: git://anongit.freedesktop.org/git)
 
 global environment variables you may set to augment functionality:
+  CC          C compiler command
+  CFLAGS      C compiler flags
+  LDFLAGS     linker flags, e.g. -L<lib dir> if you have libraries in a
+              nonstandard directory <lib dir>
+  CPPFLAGS    C/C++/Objective C preprocessor flags, e.g. -I<include dir> if
+              you have headers in a nonstandard directory <include dir>
+  CPP         C preprocessor
   CONFFLAGS:  additional flags to pass to all configure scripts
   CONFCFLAGS: additional compile flags to pass to all configure scripts
   MAKEFLAGS:  additional flags to pass to all make invocations
@@ -348,7 +355,14 @@ process() {
     if [ $needs_config -eq 1 ] || [ X"$NOAUTOGEN" = X ]; then
 	sh ${DIR_CONFIG}/${CONFCMD} --prefix=${PREFIX} ${LIB_FLAGS} \
 	    ${QUIET:+--quiet} \
-	    ${CACHE:+--cache-file=}${CACHE} ${CONFFLAGS} "$CONFCFLAGS"
+	    ${CACHE:+--cache-file=}${CACHE} \
+	    ${CONFFLAGS} \
+	    ${CC:+CC="$CC"} \
+	    ${CPP:+CPP="$CPP"} \
+	    ${CPPFLAGS:+CPPFLAGS="$CPPFLAGS"} \
+	    ${CFLAGS:+CFLAGS="$CFLAGS"} \
+	    ${LDFLAGS:+LDFLAGS="$LDFLAGS"} \
+	    "$CONFCFLAGS"
 	if [ $? -ne 0 ]; then
 	    failed ${CONFCMD} $1 $2
 	    cd $old_pwd
-- 
1.6.0.4