tidy up batch files in Visual Studio build

build.vc14/gen_config_h.bat

@@ -1,4 +1,6 @@
 @echo off
+rem %1 = directory holding config data (in cdata)
+
 echo /* generated by gen_config_h.bat */ >tmp.h
 for /f  %%a in (%1cfg.h) do (if "%%a" NEQ "" (echo #define HAVE_NATIVE_%%a 1 >>tmp.h))
 

build.vc14/gen_mpir_h.bat

@@ -1,6 +1,8 @@
 @echo off
+rem %1 = platform
+
 echo creating mpir.h for %1
-echo /* generated from gmp-h.in by gen_mpir_h.bat */>tmp.h
+echo /* generated from gmp-h.in by gen_mpir_h.bat */ >tmp.h
 
 rem if /i "%1" EQU "x64" (
 rem   echo ^#ifndef _WIN64 >>tmp.h

build.vc14/out_copy_rename.bat

@@ -1,4 +1,8 @@
 @echo off
+rem %1 = source file path
+rem %2 = destination directory
+rem %3 = destination file name
+
 if not exist %1 goto nofile
 if exist %2 goto next
 

build.vc14/postbuild.bat

@@ -1,4 +1,5 @@
 @echo off
+rem %1 = full target path
 set str=%~1
 
 rem delete anything from the path before 'build.vc14'
@@ -48,11 +49,10 @@ exit /b 0
 
 rem copy binaries to final bin_dirination directory
 rem %1 = target (build output) directory
-rem %2 = bin_dirination directory
+rem %2 = binary destination directory
 rem %3 = configuration (debug/release) 
 rem %4 = library (lib/dll)
 rem %5 = file name
-
 :copyb
 if "%4" EQU "dll" (
 	copy %1mpir.dll %2mpir.dll > nul 2>&1
@@ -75,6 +75,7 @@ if "%4" EQU "dll" (
 	call :seterr & echo ERROR: illegal library type %4  & exit /b %errorlevel%
 )
 
+rem set configuration for the tests
 call gen_test_config_props %plat% %conf%
 exit /b 0
 

build.vc14/prebuild.bat

@@ -1,14 +1,13 @@
-
+@echo off
 rem %1 = mpn directory (generic, x86\... or x86_64\...) 
 rem %2 = platform (win32 or x64)
-@echo off
 
 if /i "%2" EQU "win32" ((set platform=win32) & (set bdir=x86w\)) else ((set platform=x64) & (set bdir=x86_64w\))
 set sdir=
 if /i "%1" EQU "gc" ((set sdir=generic) & (set bdir=generic)) else (set sdir=%bdir%%1)
 if not exist ..\mpn\%sdir% (call :seterr & echo ERROR: %1 is not supported & exit /b %errorlevel%)
 
-echo.building MPIR for %1 (%platform%) from directory mpn\%sdir%
+echo building MPIR for %1 (%platform%) from directory mpn\%sdir%
 
 set cdir=cdata\mpn\%sdir%\
 set sdir=..\mpn\%sdir%\

build.vc14/to_gmp.bat

@@ -1,4 +1,5 @@
-echo off
+@echo off
+
 if exist lib\win32\release call :sub lib\win32\release
 if exist lib\win32\debug   call :sub lib\win32\debug
 if exist lib\x64\release   call :sub lib\x64\release
@@ -14,14 +15,12 @@ exit /b 0
 :sub
 echo off
 if not exist %1 exit /b 0
-cd %1
+pushd %1
 if exist mpir.dll   (ren mpir.dll   gmp.dll)
 if exist mpir.lib   (ren mpir.lib   gmp.lib)
 if exist mpir.pdb   (ren mpir.pdb   gmp.pdb)
 if exist mpir.exp   (ren mpir.exp   gmp.exp)
 if exist mpirxx.lib (ren mpirxx.lib gmpxx.lib)
 if exist mpirxx.pdb (ren mpirxx.pdb gmpxx.pdb)
-cd ..
-cd ..
-cd ..
+popd
 exit /b 0

build.vc14/to_mpir.bat

@@ -1,4 +1,5 @@
-echo off
+@echo off
+
 if exist lib\win32\release call :sub lib\win32\release
 if exist lib\win32\debug   call :sub lib\win32\debug
 if exist lib\x64\release   call :sub lib\x64\release
@@ -13,14 +14,12 @@ exit /b 0
 :sub
 echo off
 if not exist %1 exit /b 0
-cd %1
+pushd %1
 if exist gmp.dll   (ren gmp.dll   mpir.dll)
 if exist gmp.lib   (ren gmp.lib   mpir.lib)
 if exist gmp.pdb   (ren gmp.pdb   mpir.pdb)
 if exist gmp.exp   (ren gmp.exp   mpir.exp)
 if exist gmpxx.lib (ren gmpxx.lib mpirxx.lib)
 if exist gmpxx.pdb (ren gmpxx.pdb mpirxx.pdb)
-cd ..
-cd ..
-cd ..
+popd
 exit /b 0