bug#40072: Incorrect escaping on MinGW 32-bit

[Bob Friesenhahn]

On Sun, 15 Mar 2020, Jeffrey Walton wrote:

> Hi Everyone,
>
> I'm working on a MSYS2 system on a Windows 7 host. MSYS2 can be
> obtained at https://www.msys2.org/. I'm using the environment from
> msys2-i686-20190524.exe. After installing MSYS2, click the MinGW
> 32-bit link on the desktop.
>
> After configuring Expat (https://github.com/libexpat/libexpat), make
> is resulting in:
>
> libtool: link: gcc -g -O2 -Wall -Wextra -fexceptions -fno-strict-aliasing -Wmiss
> ing-prototypes -Wstrict-prototypes -pedantic -Wduplicated-cond -Wduplicated-bran
> ches -Wlogical-op -Wrestrict -Wnull-dereference -Wjump-misses-init -Wdouble-prom
> otion -Wshadow -Wformat=2 -Wmisleading-indentation -fvisibility=hidden -DXML_ENA
> BLE_VISIBILITY=1 -fno-strict-aliasing -o .libs/xmlwf.exe xmlwf-xmlwf.o xmlwf-xml
> file.o xmlwf-codepage.o xmlwf-unixfilemap.o  ../lib/.libs/libexpat.dll.a -L/ming
> w32/lib
> ./.libs/lt-xmlwf.c:164:35: error: expected ',' or ';' before 'C'
>  164 | const char * LIB_PATH_VALUE   = ""C:\\msys32\\home\\Jeffrey Walton\\libe
> xpat\\expat\\lib\\.libs";";

In my experience, Autotools has never supported paths which include 
spaces.  This is just too hard to fix given that the shell splits 
arguments on white-space by default.  Even if Autoconf, Automake, and 
Libtool where to somehow fix this problem for a well-crafted package, 
it would almost certainly fail once the configure script uses any 
shell content other than the provided macros.

There was already a challenge to solve given that backslash has 
special meaning to the shell.

For my purposes I made sure that my default Windows login directory 
does not include spaces in the path, but I also created a new 
directory path for builds which does not include spaces in the path 
and has Windows Defender scaning and automatic indexing disabled.

Bob
--
Bob Friesenhahn
address@hidden, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
Public Key,     http://www.simplesystems.org/users/bfriesen/public-key.txt