The intent is for 'make test' to pass cleanly on each platform, and thus easier
spotting of regressions. Linux is best supported by most tests running and
passing. Mac OSX passes mosts tests that do not make/link with binary files,
due to lack of mach-o file support.
!!! I have very limited knowledge of Windows platform, and cannot comment why
all tests(1) fail. I have posted to newsgroup asking for someone to test
Windows platform.
The tests are taken almost verbatim from the open source project PicoC. It can
be found at https://code.google.com/p/picoc/.
The tests range from very simple/trivial ones to more complicated. My view is
that the more tests the better. Without tests like this I was very reluctant to
make any changes to tcc for the fear of breaking things.
The tests pass on Win32, OSX, Linux x86 and x86_64. One or two tests fail on
each platform due to differences in the runtime library.
When using gcc compiler (as opposed to llvm) to build 32 bit tcc, compiler flags
-mpreferred-stack-boundary=2, -march=i386 and -falign-functions=2 were being
used. -march is redundant as -m32 is already being used. The other two seem to
be corrupting stack. I am not sure why this is the case, as the explanation of
the flags states that only running code size should be affected, but it does.
I think that is is safe to remove these flags altogether for all compilers and
platforms, especially since they are not being used for 64 bit builds. However
I do not want to apply such wide change without agreement from the people on the
mailing list.
Other tests still have issues, currently with weak linking.
One of the primary stumbling blocks on OSX is the lack of support for
mach-o binaries. Therefore all tcc usage on OSX has to be limited to elf
binaries, presumably produced by tcc itself.
Therefore I had to enable building of tiny_libmaker for OSX. Then changed
the make to use tcc and tiny_libmaker to compile the tcclib1.
In order to compile the tests, specifically the parts that use weak linking,
I have had to define MACOSX_DEPLOYMENT_TARGET to 10.2, which seems like a
hack, but extensive searching seems to indicate that this is the only way
to make apple gcc allow weak linking. Using any other value, bigger or smaller
breaks weak linking.
Also added _ANSI_SOURCE define required by some OSX headers, and some cosmetic
gitignore changes. I believe these changes should not impact other platforms.
to the appropriate CFLAGS. In addition, memory hooks are very different
on OSX, so build of bcheck.c had to be disabled for now.
Change of the CFLAGS does affect builds on other platforms, and this needs
to be tested.
Applied patch found on stackoverflow (link below). I also found some
related changes that looked like logically needed. The stackoverflow
changes addressed only two registers which were breaking a compile.
However reading the code in the same file shows two other register
accesses that, while not breaking the build, should have the same fix.
http://stackoverflow.com/questions/3712902/problems-compiling-tcc-on-os-x/3713144#3713144
The test driver was changed by changing 'cp -u' into 'cp' as '-u' is not
supported on mac osx.
I found that osx build required the WITHOUT_LIBTCC define. I suspect the
reason for this is tcc unability to handle mach-o files. In order to
properly address this I had to change 'configure' to propagate target os
name to Makefile.
Current state is that simple tests work, but not the whole 'make test'
suite runs.
To the best of my knowledge, these changes should not impact other
platforms.
Milutin Jovanović