output static lib is being deleted after compilation

[veksha]

Example

compile your nim file (even empty) using nim c --app:staticLib sometest.nim

Current Output

File sometest.lib gets created and then deleted instantly.

Hint: used config file 'D:\Programm\Nim\Nim-devel\config\nim.cfg' [Conf]
Hint: used config file 'D:\Programm\Nim\Nim-devel\config\config.nims' [Conf]
Hint: used config file 'D:\Programm\Nim\nimwrap\sometest.nim.cfg' [Conf]
........................................................
CC: sometest.nim
Hint:  [Link]
Hint: gc: refc; opt: none (DEBUG BUILD, `-d:release` generates faster code)
26617 lines; 1.724s; 31.941MiB peakmem; proj: D:\Programm\Nim\nimwrap\sometest.nim; out: D:\Programm\Nim\nimwrap\sometest.lib [SuccessX]

Expected Output

file sometest.lib being created and stays put.

Possible Solution

Additional Information

git bisect shows this commit as first bad:
ba64d0c

--- a/compiler/extccomp.nim
+++ b/compiler/extccomp.nim
@@ -662,6 +662,7 @@ proc addExternalFileToCompile*(conf: ConfigRef; filename: AbsoluteFile) =
 proc getLinkCmd(conf: ConfigRef; output: AbsoluteFile,
                 objfiles: string, isDllBuild: bool): string =
   if optGenStaticLib in conf.globalOptions:
+    removeFile output # fixes: bug #16947
     result = CC[conf.cCompiler].buildLib % ["libfile", quoteShell(output),
                                             "objfiles", objfiles]
   else:

But i personally see nothing wrong about it. the output file gets deleted before the call to buildLib.
this is very strange. please help.

• Issue --app:staticlib -o:lib fails if lib already exists and isn't a valid static library file #16947 is related

$ nim -v
Nim Compiler Version 1.5.1 [Windows: amd64]
Compiled at 2021-07-25
Copyright (c) 2006-2021 by Andreas Rumpf

git hash: f4ff276a90091f2b88c191aac5a201dcb3ec9795
active boot switches:

gcc and ld version

gcc -v
Using built-in specs.
COLLECT_GCC=D:\Programm\mingw64\bin\gcc.exe
COLLECT_LTO_WRAPPER=d:/programm/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/10.2.0/lto-wrapper.exe
Target: x86_64-w64-mingw32
Configured with: ../gcc-10.2.0/configure --build=x86_64-w64-mingw32 --enable-targets=all --enable-multilib --enable-64bit --disable-dependency-tracking --prefix=/mingw64 --with-sysroot=/mingw64 --disable-shared --enable-static --disable-nls --enable-version-specific-runtime-libs --disable-win32-registry --without-dwarf2 --enable-sjlj-exceptions --enable-fully-dynamic-string --enable-languages=c,d,ada,lto,c++,objc,obj-c++,fortran --enable-libgomp --enable-lto --enable-libssp -enable-gnattools --disable-bootstrap --with-gcc --with-gnu-as --with-gnu-ld --with-stabs --enable-interwork --with-mpfr-include=/home/betta/gcc-build/../gcc-10.2.0/mpfr/src --with-mpfr-lib=/home/betta/gcc-build/mpfr/src/.libs --enable-objc-gc --with-target-bdw-gc=/mingw64
Thread model: win32
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)

ld -v
GNU ld (GNU Binutils) 2.35.1