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-rw-r--r--INSTALL41
-rwxr-xr-xconfigure22
2 files changed, 40 insertions, 23 deletions
diff --git a/INSTALL b/INSTALL
index fb37c39..268a7fa 100644
--- a/INSTALL
+++ b/INSTALL
@@ -42,23 +42,30 @@ off them.
Controlling a build process via environment variables is a big and
dangerous hammer. You should try and pass flags to configure instead;
-nevertheless, the standard environment variables are recognized.
+nevertheless, a few standard environment variables are recognized.
- The value of the CROSS_COMPILE environment variable will prefix the
-building tools' names. The --enable-cross option is preferred, see
-"Cross-compilation" below.
-
If the CC environment variable is set, its value will override compiler
-detection by configure.
+detection by configure. The --host=HOST option will still add a HOST-
+prefix to the value of CC.
The values of CFLAGS, CPPFLAGS and LDFLAGS will be appended to flags
auto-detected by configure. To entirely override the flags set by
-configure, use make -e.
+configure instead, use make variables.
- The value of LDLIBS will be appended by make to command lines that link
-an executable, even without the -e option.
- The Makefile supports the DESTDIR convention for staging.
+* Make variables
+ --------------
+
+ You can invoke make with a few variables for more configuration.
+
+ CC, CFLAGS, CPPFLAGS, LDFLAGS, LDLIBS, AR, RANLIB, STRIP, INSTALL and
+CROSS_COMPILE can all be overridden on the make command line. This is
+an even bigger hammer than running ./configure with environment
+variables, so it is advised to only do this when it is the only way of
+obtaining the behaviour you want.
+
+ DESTDIR can be given on the "make install" command line in order to
+install to a staging directory.
* Shared libraries
@@ -93,13 +100,15 @@ to static linking, for instance musl: http://musl-libc.org/)
cross-compilation in one place: skalibs. Once you have
cross-compiled skalibs, the rest is easy.
- Use the --enable-cross=PREFIX option to configure, or simply
---enable-cross if your default toolchain is a cross-compiling
-toolchain. And make sure to use the correct version of skalibs
-for your target, and the correct sysdeps directory, making use
-of the --with-include, --with-lib, --with-dynlib and --with-sysdeps
+ * Use the --host=HOST option to configure, HOST being the triplet
+for your target.
+ * Make sure your cross-toolchain binaries (i.e. prefixed with HOST-)
+are accessible via your PATH environment variable.
+ * Make sure to use the correct version of skalibs for your target,
+and the correct sysdeps directory, making use of the
+--with-include, --with-lib, --with-dynlib and --with-sysdeps
options as necessary.
-
+
* The slashpackage convention
---------------------------
diff --git a/configure b/configure
index 3378c99..ab7279f 100755
--- a/configure
+++ b/configure
@@ -43,7 +43,6 @@ Optional features:
--disable-allstatic do not prefer linking against static libraries [enabled]
--enable-static-libc make entirely static binaries [disabled]
--enable-slashpackage[=ROOT] assume /package installation at ROOT [disabled]
- --enable-cross=CROSS prefix toolchain executable names with CROSS [none]
EOF
exit 0
@@ -150,7 +149,7 @@ addlibspath=''
addlibdpath=''
vpaths=''
vpathd=''
-cross="$CROSS_COMPILE"
+build=
for arg ; do
case "$arg" in
@@ -179,11 +178,9 @@ for arg ; do
--enable-slashpackage=*) sproot=${arg#*=} ; slashpackage=true ; ;;
--enable-slashpackage) sproot= ; slashpackage=true ;;
--disable-slashpackage) sproot= ; slashpackage=false ;;
- --enable-cross=*) cross=${arg#*=} ;;
- --enable-cross) ;;
- --disable-cross) cross= ;;
- --enable-*|--disable-*|--with-*|--without-*|--*dir=*|--build=*) ;;
+ --enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;;
--host=*|--target=*) target=${arg#*=} ;;
+ --build=*) build=${arg#*=} ;;
-* ) echo "$0: unknown option $arg" ;;
*=*) ;;
*) target=$arg ;;
@@ -252,6 +249,11 @@ if $slashpackage ; then
fi
# Find a C compiler to use
+if test -n "$target" && test x${build} != x${target} ; then
+ cross=${target}-
+else
+ cross=
+fi
echo "checking for C compiler..."
trycc ${cross}${CC}
trycc ${cross}gcc
@@ -270,7 +272,13 @@ else
fi
echo "checking target system type..."
-test -n "$target" || target=$($CC_AUTO -dumpmachine 2>/dev/null) || target=unknown
+if test -z "$target" ; then
+ if test -n "$build" ; then
+ target=$build ;
+ else
+ target=$($CC_AUTO -dumpmachine 2>/dev/null) || target=unknown
+ fi
+fi
echo " ... $target"
if test ! -d $sysdeps || test ! -f $sysdeps/target ; then
echo "$0: error: $sysdeps is not a valid sysdeps directory"