altcross.sh: automatically figure out GCC version

altcross.sh

@@ -2,19 +2,21 @@
 set -e
 set -x
 
-KERNEL_VERSION='5.10'
-BINUTILS_VERSION='2.35.2'
-GCC_VERSION='10.3.1-20210703'
-GLIBC_VERSION='2.32-alt4'
+TARGET=aarch64-linux-gnu
 
 KERNEL_SOURCE="`find /usr/src/kernel/sources -type f -name 'kernel-source-*.tar'`"
 BINUTILS_SOURCE="`find /usr/src/binutils-source -type f -name 'binutils-*.tar'`"
 GCC_SOURCE="`find /usr/src/gcc-source -type f -name 'gcc-*.tar'`"
 GLIBC_SOURCE="`find /usr/src/glibc-source -type f -name 'glibc-*.tar'`"
 
+getversion() {
+	local fname="${1##*/}"
+	local bname="${fname%.tar*}"
+	local ver="${bname#*-}"
+	echo "$ver"
+}
 
-TARGET=aarch64-linux-gnu
-
+GCC_VERSION=`getversion $GCC_SOURCE`
 GCC_MAJOR_VERSION="${GCC_VERSION%%.*}"
 
 BUILDDIR="`pwd`/build"