build with sh-elf by default (fixes #1)

Makefile

@@ -3,7 +3,7 @@
 
 cflags := -m3 -mb -ffreestanding -nostdlib -fstrict-volatile-bitfields -Wall \
           -Wextra -Os -I .
-target ?= sh3eb-elf
+target ?= sh-elf
 lib    := libprof.a
 header := libprof.h
 

README.md

@@ -10,33 +10,31 @@ code.
 
 ## Building
 
-libprof is built only once for both fx-9860G and fx-CG 50, but if you use
-different compilers you will need to install it twice. The dependencies are:
+libprof is built and installed only once for both fx-9860G and fx-CG 50. The
+The dependencies are:
 
 * A GCC cross-compiler for a SuperH architecture
 * The [gint kernel](/Lephenixnoir/gint)
 
-The Makefile will build the library without further instructions.
+The Makefile will build and install the library without further instructions.
 
 ```sh
 % make
+% make install
 ```
 
-By default `sh3eb-elf` is used to build; you can override this by setting the
+By default `sh-elf` is used to build; you can override this by setting the
 `target` variable.
 
 ```sh
 % make target=sh4eb-elf
-```
-
-Install as usual:
-
-```sh
-% make install
-# or
 % make install target=sh4eb-elf
 ```
 
+If you have the older setup with two toolchains (`sh3eb-elf` and `sh4eb-elf`),
+instead of the new one with two targets on the same toolchain (`sh-elf`), you
+will need to make and install twice.
+
 ## Basic use
 
 To access the library, include the `<libprof.h>` header file.