-simple libc tests
-based on the libc-testsuit and libc-bench of dalias
-see http://git.etalabs.net/cgi-bin/gitweb.cgi
+libc-test is developed as part of the musl project
+http://www.musl-libc.org/
-build tests:
- cp dist/config.mak .
- # edit config.mak
+configuring:
+ cp config.mak.def config.mak
+ edit config.mak
+build and run tests:
make
-run tests:
- make
-run benchmarks:
- make b
-
-framework:
-
-the only hook in the test framework is error(...) which
-prints a formatted message and sets the test to failed
-see common/test.h
-
-a test function looks like
- void test_foo() {
- if (foo != 42)
- error("foo=%d expected 42\n", foo);
- }
-extern functions with name ~ /^test/ are recognized to be
-test functions
-
-a benchmark function looks like
- void bench_foo(int N) {
- for (i = 0; i < N; i++)
- foo();
- }
-benchmark functions are repeatedly called with an increasing
-N until the running time is long enough, then time/N is printed
-
-see Makefile.inc for build system details
-see common/t.c for test details
-see common/b.c for benchmark details
+clean up:
+ make clean
+
+make builds all test binaries and runs them to create
+a REPORT file that contains all build and runtime errors
+(this means that make does not stop at build failures)
+
+contributing tests:
+
+design goals:
+
+- tests should be easy to run and build even a single test in isolation
+(so test should be self contained if possible)
+- failure of one test should not interfere with others
+(build failure, crash or unexpected results are all failures)
+- test output should point to the cause of the failure
+- test results should be robust
+- the test system should have minimal dependency
+(libc, posix sh, gnu make)
+- the test system should run on all archs and libcs
+- tests should leave the system in a clean state
+
+conventions:
+
+each test is in a separate file at a path like src/directory/file.c with
+its own main
+
+the test should return 0 on success and non-0 on failure, on failure it
+should print error messages to standard out if possible, on success no
+message should be printed
+
+to help with the above test protocol use t_error function for printing
+errors and return t_status from main, see src/common/test.h
+(t_error allows standard printf formatting, outputs at most 512bytes
+in a single write call to fd 1, so there is no buffering, long outputs
+are truncated, it sets the global t_status to 1)
+
+it is common to do many similar checks in a test, in such cases macros
+may be used to simplify the code like
+#define T1(a,b) (check(a,b) || (t_error("check(%s,%s) failed\n", a, b),0))
+#define T2(f,w) (result=(f), result==(w) || (t_error("%s failed: got %s, want %s\n", #f, result, w),0))
+
+binaries should be possible to run from arbitrary directory.
+the build system runs the tests using the src/common/runtest tool which
+kills the test process after a timeout and reports the exit status
+in case of failure
+
+directories:
+
+src/api: interface tests, build time include header tests
+src/common: common utilities compiled into libtest.a
+src/functional: functional tests aiming for large coverage of libc
+src/math: tests for each math function with input-output test vectors
+src/regression: regression tests aiming for testing particular bugs
+
+initial set of functional tests are derived from the libc-testsuit of
+Rich Felker, regression tests should contain reference of the bug
+(musl commit hash, glibc bug tracker url, etc)
+
+build system:
+
+the main non-file make targets are all, run, clean and cleanall.
+(cleanall removes the reports unlike clean, run reruns the dynamically
+linked executables)
+
+make variable can be overridden from config.mak or the make command line,
+the variable B sets the build directory which is src by default
+
+for each directory under src there are targets like $(B)/directory/all,
+$(B)/directory/run and $(B)/directory/clean to make only the contents
+of that directory, each directory has its own Makefile set up so it
+invokes the top level make with B=src src/directory/foo for the foo
+target, so it is possible to work only under a specific test directory
+
+the build and runtime errors of each target are accumulated into a
+target.err file and in the end they are concatenated into a REPORT
+
+each .c file in src/functional and src/regression are built into a
+dynamic linked and a static linked executable test binary by default,
+this behaviour can be changed by a similarly named .mk file changing
+make variables and specifying additional rules:
+
+$(B)/$(N) is the name of the binary target (the file name without the .c)
+$(B)/$(N)-static is the name of the static binary target
+$(B)/$(D) is the build directory
+$(N).CFLAGS are added to the CFLAGS at compilation
+$(N).LDFLAGS are added to the LDFLAGS at linking
+$(N).LDLIBS are added to the LDLIBS at linking
+$(N).BINS are the targets (if empty no binaries are built)
+$(N).LIBS are the non-executable targets (shared objects may use it)
+
+if a binary is linked together from several .o files then they
+have to be specified as prerequisits for the binary targets and
+added to the $(N).LDLIBS as well
+
+if a binary depends on a file at runtime (eg. a .so opened by dlopen)
+then the $(N).err target should depend on that file
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