For the following reasons:
- Native windows links are rarely used in general.
- Require elevated privileges even if the current user has administrator
privileges (needs further "run as administrator").
- Most/all windows shell environments capable of running configure already
support ln (msys[1], msys2, most probably cygwin too).
- If cross building tcc on linux for windows then native mklink is not
available, as well as 'cmd' (in this scenario the build later fails
for other reasons, but at least configures succeeds now).
- cp is good enough as fallback since we only copy 5 makefiles anyway.
- The only environment I'm aware of which doesn't support ln -s is busybox
for windows, and with this patch it falls back to cp and completes
configure successfully (and the build later succeeds, assuming valid
$CC and $AR).
_alloca is not part of msvcrt (and therefore not found if used), and tcc has
an internal implementation for alloca for x86[_64] since d778bde7 - initally
as _alloca and later changed to alloca. Use it instead.
- Syntax is now much closer to gnu ar, but still supports whatever was
supported before, with the following exceptions (which gnu ar has too):
- lib is now mandatory (was optional and defaulted to ar_test.a before).
- Path cannot start with '-' (but ./-myfile.o is OK).
- Unlike gnu ar, modes are still optional (as before).
- Now supports also (like gnu ar):
- First argument as options doesn't have to start with '-', later options do.
- Now supports mode v (verbose) with same output format as gnu ar.
- Any names for lib/objs (were limited to .a/.o - broke cmake on windows).
- Now explicitly fail on options which would be destructive for the user.
- Now doesn't get confused by options between file arguments.
- Still ignores other unknown options - as before.
- Now doesn't read out-of-bounds if an option is one char.
- As a result, cmake for windows can now use tiny_libmaker as ar, and
configure can also detect tiny_libmaker as a valid ar (both couldn't before).
Ignoring all options could previously cause to misinterpret the mode in a
destructive way, e.g. if the user wanted to do something with an existing
archive (such as p - print, or x - extract, etc), then it would instead just
delete (re-create) the archive.
Modes which can be destructive if ignored now explicitly fail. These include
[habdioptxN]. Note that 'h' can be ignored, but this way we also implicitly
print the usage for -h/--help.
The .a/.o name limitations previously resulted in complete failure on some
cases, such as cmake on windows which uses <filename>.obj and <libname>.lib .
Fixed: e.g. 'tiny_libmaker r x.a x.o' was reading out of bounds [-1] for 'r'.
round and fmin/fmax are relatively commonly used functions but were not
implemented anywhere in the tcc Windows distribution package. Newer mingw(64)
math.h stil doesn't include these implementations.
Add C implementations for these functions and place it as inline functions at
win32/include/tcc/tcc_libm.h - which is already included from math.h .
The code is mostly taken from musl-libc rs-1.0 (MIT) [*],
musl-libc: http://git.musl-libc.org/cgit/musl/tree/src/math?h=rs-1.0
license: http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT?h=rs-1.0
Potential enhancements:
- Check how many useful libm implementations are still missing and consider
adding them (some of them already work via the MS runtime).
- Consider putting libm implementations in an actual libm.a file, or add a dummy
one such that build processes which try to link with libm will not fail.
The asm code cannot currently be used with tcc since tcc doesn't support 't'
constraint.
Use inline C implementation instead, place it win32/include/tcc/tcc_libm.h, and
include it from win32/include/math.h.
Since fpclassify now works, it also fixes few other macros which depend on it.
Implicitly fixed: isfinite, isinf, isnan, isnormal.
The implementations were taken from musl-libc rs-1.0 (MIT license).
musl-libc: http://git.musl-libc.org/cgit/musl/tree/src/math?h=rs-1.0
license: http://git.musl-libc.org/cgit/musl/tree/COPYRIGHT?h=rs-1.0
It was broken due to tcc not able to compile asm with 't' constraint, and it's
still broken because fpclassify on which it now depends has the same issue. Next
commit will fix this.
Avi Halachmi (:avih)