Robert Haas <> writes:
> The relevant portion of config.log seems to be this:

> configure:13285: gcc -o conftest.exe -Wall -Wmissing-prototypes
> -Wpointer-arith -Wdeclaration-after-statement -Wendif-labels
> -Wmissing-format-attribute -Wformat-security -fno-strict-aliasing
> -fwrapv -fexcess-precision=standard -O2
> -I/home/Admin/sources/postgresql-9.5.0/src/include/port/win32
> -DEXEC_BACKEND -Wl,--allow-multiple-definition
> -Wl,--disable-auto-import conftest.c -lz -lws2_32 -lm >&5
> conftest.c:106:5: warning: no previous prototype for 'does_int64_work'
> [-Wmissing-prototypes] int does_int64_work()
> conftest.c:120:1: warning: return type defaults to 'int' [-Wimplicit-int]
> conftest.c: In function 'main':
> conftest.c:121:3: warning: implicit declaration of function 'exit'
> [-Wimplicit-function-declaration]
> conftest.c:121:3: warning: incompatible implicit declaration of
> built-in function 'exit'
> conftest.c:121:3: note: include '<stdlib.h>' or provide a declaration of 
> 'exit'
> C:/Apps/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/5.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
> reopening conftest.exe: Permission denied
> C:/Apps/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/5.3.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
> final link failed: Permission denied collect2.exe: error: ld returned
> 1 exit status
> configure:13285: $? = 1 configure: program exited with status 1

I do not think configure pays attention to mere warnings for this type of
test.  The real problem here seems to be the "permission denied" errors,
which to me reek of broken Windows antivirus software.  (As far as I'm
aware, the word "broken" is redundant in that phrase.)

> I'm a little confused as to why -Wno-cpp fixes any of that, though.

Most likely, it's pure chance that a retry worked.  Or if it's repeatable,
maybe no-cpp changes the compiler's file access patterns enough that
there's no longer a false trip of the AV check.

Short answer is that I wonder how much of the OP's multiple problems
are being caused by AV bugs.

                        regards, tom lane

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