fate: Allow overriding what targets to make for running the tests

This can be useful if doing testing of uncommon CPU extensions by
running tests with QEMU (by configuring with e.g.
"target_exec=qemu-aarch64"), by only running the checkasm tests,
to get a reasonable test coverage without excessive test runtime.

For such a config, setting fate_targets="fate-checkasm fate-cpu"
can be a good tradeoff.

Signed-off-by: Martin Storsjö <martin@martin.st>

doc/fate_config.sh.template

@@ -31,3 +31,5 @@ makeopts=       # extra options passed to 'make'
                 # defaulting to makeopts above if this is not set
 #tar=           # command to create a tar archive from its arguments on stdout,
                 # defaults to 'tar c'
+#fate_targets=  # targets to make when running fate; defaults to "fate",
+                # can be set to run a subset of tests, e.g. "fate-checkasm".

tests/fate.sh

@@ -75,7 +75,7 @@ compile()(
 fate()(
     test "$build_only" = "yes" && return
     cd ${build} || return
-    ${make} ${makeopts_fate-${makeopts}} -k fate
+    ${make} ${makeopts_fate-${makeopts}} -k ${fate_targets}
 )
 
 clean(){
@@ -103,6 +103,7 @@ cd ${workdir}       || die "cd ${workdir} failed"
 src=${workdir}/src
 : ${build:=${workdir}/build}
 : ${inst:=${workdir}/install}
+: ${fate_targets:=fate}
 
 test -d "$src" && update || checkout || die "Error fetching source"