MINGW build failing in coverage tests

[pmqs]

Trying out a MinGW workflow (see https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884)

I'm running configure, which appears to be ok.

$ ./configure --warn
If this doesn't work for you, try win32/Makefile.gcc.
Checking for shared library support...
Building shared library libz.so.1.3.1.1-motley with gcc.
Checking for size_t... Yes.
Checking for off64_t... No.
Checking for fseeko... Yes.
Checking for strerror... Yes.
Checking for unistd.h... Yes.
Checking for stdarg.h... Yes.
Checking whether to use vs[n]printf() or s[n]printf()... using vs[n]printf().
Checking for vsnprintf() in stdio.h... Yes.
Checking for return value of vsnprintf()... Yes.
Checking for attribute(visibility) support... No.

It builds fine & the standard tests pass,

gcc -O3 -Wall -Wextra -I. -c -o example.o test/example.c
gcc -O3 -Wall -Wextra  -c -o adler[32](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:6:33).o adler32.c
gcc -O3 -Wall -Wextra  -c -o crc32.o crc32.c
gcc -O3 -Wall -Wextra  -c -o deflate.o deflate.c
gcc -O3 -Wall -Wextra  -c -o infback.o infback.c
gcc -O3 -Wall -Wextra  -c -o inffast.o inffast.c
gcc -O3 -Wall -Wextra  -c -o inflate.o inflate.c
gcc -O3 -Wall -Wextra  -c -o inftrees.o inftrees.c
gcc -O3 -Wall -Wextra  -c -o trees.o trees.c
gcc -O3 -Wall -Wextra  -c -o zutil.o zutil.c
gcc -O3 -Wall -Wextra  -c -o compress.o compress.c
gcc -O3 -Wall -Wextra  -c -o uncompr.o uncompr.c
gcc -O3 -Wall -Wextra  -c -o gzclose.o gzclose.c
gcc -O3 -Wall -Wextra  -c -o gzlib.o gzlib.c
gcc -O3 -Wall -Wextra  -c -o gzread.o gzread.c
gcc -O3 -Wall -Wextra  -c -o gzwrite.o gzwrite.c
gcc -O3 -Wall -Wextra -I. -c -o minigzip.o test/minigzip.c
gcc -O3 -fPIC  -DPIC -c -o objs/adler32.o adler32.c
gcc -O3 -fPIC  -DPIC -c -o objs/crc32.o crc32.c
gcc -O3 -fPIC  -DPIC -c -o objs/deflate.o deflate.c
gcc -O3 -fPIC  -DPIC -c -o objs/infback.o infback.c
gcc -O3 -fPIC  -DPIC -c -o objs/inffast.o inffast.c
gcc -O3 -fPIC  -DPIC -c -o objs/inflate.o inflate.c
gcc -O3 -fPIC  -DPIC -c -o objs/inftrees.o inftrees.c
gcc -O3 -fPIC  -DPIC -c -o objs/trees.o trees.c
gcc -O3 -fPIC  -DPIC -c -o objs/zutil.o zutil.c
gcc -O3 -fPIC  -DPIC -c -o objs/compress.o compress.c
gcc -O3 -fPIC  -DPIC -c -o objs/uncompr.o uncompr.c
gcc -O3 -fPIC  -DPIC -c -o objs/gzclose.o gzclose.c
gcc -O3 -fPIC  -DPIC -c -o objs/gzlib.o gzlib.c
gcc -O3 -fPIC  -DPIC -c -o objs/gzread.o gzread.c
gcc -O3 -fPIC  -DPIC -c -o objs/gzwrite.o gzwrite.c
ar rc libz.a adler32.o crc32.o deflate.o infback.o inffast.o inflate.o inftrees.o trees.o zutil.o compress.o uncompr.o gzclose.o gzlib.o gzread.o gzwrite.o 
gcc -O3 -Wall -Wextra  -o example.exe example.o -L. libz.a
gcc -O3 -Wall -Wextra  -o minigzip.exe minigzip.o -L. libz.a
gcc -shared -O3 -fPIC -o libz.so.1.3.1.1-motley adler32.lo crc32.lo deflate.lo infback.lo inffast.lo inflate.lo inftrees.lo trees.lo zutil.lo compress.lo uncompr.lo gzclose.lo gzlib.lo gzread.lo gzwrite.lo   
rm -f libz.so libz.so.1
ln -s libz.so.1.3.1.1-motley libz.so
ln -s libz.so.1.3.1.1-motley libz.so.1
gcc -O3 -Wall -Wextra -o examplesh.exe example.o  -L. libz.so.1.3.1.1-motley
gcc -O3 -Wall -Wextra -o minigzipsh.exe minigzip.o  -L. libz.so.1.3.1.1-motley


$ make test
hello world
zlib version 1.3.1.1-motley = 0x1311, compile flags = 0xa[9](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:7:10)
uncompress(): hello, hello!
gzread(): hello, hello!
gzgets() after gzseek:  hello!
inflate(): hello, hello!
large_inflate(): OK
after inflateSync(): hello, hello!
inflate with dictionary: hello, hello!
		*** zlib test OK ***
hello world
zlib version 1.3.1.1-motley = 0x13[11](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:7:12), compile flags = 0xa9
uncompress(): hello, hello!
gzread(): hello, hello!
gzgets() after gzseek:  hello!
inflate(): hello, hello!
large_inflate(): OK
after inflateSync(): hello, hello!
inflate with dictionary: hello, hello!
		*** zlib shared test OK ***

but is failing in the coverage test

gcc -O3 -Wall -Wextra -I. -c -o infcover.o test/infcover.c
gcc -O3 -Wall -Wextra -o infcover infcover.o libz.a
rm -f *.gcda

./infcover
1.3.1.1-motley
inflate init: 7160 allocated
prime: 7160 high water mark
force window allocation: 79856 high water mark
force window replacement: 148[32](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:7:33) high water mark
force split window update: 14832 high water mark
use fixed blocks: 7160 high water mark
bad window size: 7160 high water mark
wrong version: 0 high water mark
inflate built-in memory routines
inflate bad parameters
bad gzip method: 7160 high water mark
bad gzip flags: 7160 high water mark
bad zlib method: 7160 high water mark
set window size from header: 14320 high water mark
bad zlib window size: 7160 high water mark
check adler32: 7160 high water mark
bad header crc: 7160 high water mark
check gzip length: 7160 high water mark
bad zlib header check: 7160 high water mark
need dictionary: 14832 high water mark
compute adler32: 79856 high water mark
miscellaneous, force memory errors: 14576 high water mark
inflateBack bad parameters
inflateBack bad state: 7160 high water mark
inflateBack built-in memory routines
invalid stored block lengths-late: 7160 high water mark
invalid stored block lengths-back: 7160 high water mark
fixed-late: 7160 high water mark
fixed-back: 7160 high water mark
invalid block type-late: 7160 high water mark
invalid block type-back: 7160 high water mark
stored-late: [39](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:7:40)928 high water mark
stored-back: 7160 high water mark
too many length or distance symbols-late: 7160 high water mark
too many length or distance symbols-back: 7160 high water mark
invalid code lengths set-late: 7160 high water mark
invalid code lengths set-back: 7160 high water mark
invalid bit length repeat-late: 7160 high water mark
invalid bit length repeat-back: 7160 high water mark
invalid bit length repeat-late: 7160 high water mark
invalid bit length repeat-back: 7160 high water mark
invalid code -- missing end-of-block-late: 7160 high water mark
invalid code -- missing end-of-block-back: 7160 high water mark
invalid literal/lengths set-late: 7160 high water mark
invalid literal/lengths set-back: 7160 high water mark
invalid distances set-late: 7160 high water mark
invalid distances set-back: 7160 high water mark
invalid literal/length code-late: 7160 high water mark
invalid literal/length code-back: 7160 high water mark
invalid distance code-late: 7160 high water mark
invalid distance code-back: 7160 high water mark
invalid distance too far back-late: 7160 high water mark
invalid distance too far back-back: 7160 high water mark
incorrect data check-late: 7160 high water mark
incorrect length check-late: 7160 high water mark
pull 17-late: 7160 high water mark
pull 17-back: 7160 high water mark
long code-late: 7160 high water mark
long code-back: 7160 high water mark
length extra-late: 39928 high water mark
length extra-back: 7160 high water mark
long distance and extra-late: 39928 high water mark
long distance and extra-back: 7160 high water mark
window end-late: 39928 high water mark
window end-back: 7160 high water mark
inflate_fast TYPE return: 7160 high water mark
window wrap: 14832 high water mark
inflate_table not enough errors
fast length extra bits: 7160 high water mark
fast distance extra bits: 7160 high water mark
fast invalid distance code: 7160 high water mark
fast invalid literal/length code: 7160 high water mark
fast 2nd level codes and too far back: 7160 high water mark
very common case: 14832 high water mark
contiguous and wrap around window: 14832 high water mark
copy direct from output: 7[41](https://github.com/pmqs/zlib/actions/runs/7862720591/job/21452504884#step:7:42)6 high water mark
gcov inf*.c
infback.gcno:cannot open notes file
infback.gcda:cannot open data file, assuming not executed
inffast.gcno:cannot open notes file
inffast.gcda:cannot open data file, assuming not executed
inflate.gcno:cannot open notes file
inflate.gcda:cannot open data file, assuming not executed
inftrees.gcno:cannot open notes file
inftrees.gcda:cannot open data file, assuming not executed
No executable lines
make: *** [Makefile:124: cover] Error 1
``

[dbjh]

Would the coverage test also be the place to test whether large file support is working properly? Both the MinGW and MinGW-w64 (default build) targets appear to have never worked properly for large files (>4GB). See #934.
BTW the mingw32 toolchain of MinGW-w64 is not the same as MinGW (the original, "MinGW.org").

[madler]

Would the coverage test also be the place to test whether large file support is working properly?

No. infcover is a deep test of just the inflate code, which has nothing to do with large files. Or with files at all for that matter.

[madler]

infcover needs to be used with a libz that was built using configure's --cover option. Then you should get output that looks like this:

File 'infback.c'
Lines executed:100.00% of 302
Creating 'infback.c.gcov'

File 'inffast.c'
Lines executed:99.47% of 190
Creating 'inffast.c.gcov'

File 'inflate.c'
Lines executed:95.87% of 823
Creating 'inflate.c.gcov'

File 'inftrees.c'
Lines executed:100.00% of 139
Creating 'inftrees.c.gcov'

[pmqs]

infcover needs to be used with a libz that was built using configure's --cover option. Then you should get output that looks like this:

File 'infback.c'
Lines executed:100.00% of 302
Creating 'infback.c.gcov'

File 'inffast.c'
Lines executed:99.47% of 190
Creating 'inffast.c.gcov'

File 'inflate.c'
Lines executed:95.87% of 823
Creating 'inflate.c.gcov'

File 'inftrees.c'
Lines executed:100.00% of 139
Creating 'inftrees.c.gcov'

Just looking at an Ubuntu build on my dev box, I don't see the coverage code in play at all when I run ./configure --warn; make test.

To get Ubuntu to run the coverage tests I need ./configure --warn --cover; make test cover.

Not sure why the MINGW code is triggering it at all with my previous attempt , given I didn't ask for coverage.

Let's try adding --cover anyway... ok, that makes things 50% better. Now all the gcc builds work fine.

On the flip side, all the clang builds fail (see https://github.com/pmqs/zlib/actions/runs/7874628236/job/21484681152)

/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld: libz.a(inflate.o/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld):inflate.c:(.text+0x647a): undefined reference to `llvm_gcda_start_file'
: minigzip.o:minigzip.c/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld:(: .text+0xlibz.af97(): undefined reference to `inflate.o):inflate.c:(.text+0x64ad): undefined reference to `llvm_gcda_emit_function'
llvm_gcda_start_file'
/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld: : libz.a(inflate.o):minigzip.oinflate.c::(minigzip.c:(.text+0xfa9): undefined reference to `llvm_gcda_emit_function'
.text+0x64b8): undefined reference to `/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ldllvm_gcda_emit_arcs: minigzip.o:minigzip.c:'
(.text+0xfba)/usr/lib/gcc/x86_64-pc-msys/13.2.0/../../../../x86_64-pc-msys/bin/ld: undefined reference to `llvm_gcda_emit_arcs'

This link msys2/MINGW-packages#2148 suggests that coverage on windows with clang is (or has been) broken.

Next try disabling the cover tests for clang. That fails in the standard tests (see https://github.com/pmqs/zlib/actions/runs/7875157382/job/21486417752)

hello world
gzprintf err: 
zlib version 1.3.1.1-motley = 0x1311, compile flags = 0xa9
uncompress(): hello, hello!
		*** zlib test FAILED ***
make: *** [Makefile:85: teststatic] Error 1

I think the gzprintf err: line is from example.c