Add note that precompiled headers do not work on current Cygwin.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@35943 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/base/readme.txt

@@ -59,6 +59,10 @@ b) Cygwin
 
    Please refer to the Unix section below.
 
+   Note that gcc's precompiled headers do not work on current versions of
+   Cygwin. If your version of Cygwin is affected you will need to use the
+   --disable-precomp-headers configure option.
+
 c) Borland
 
    Please refer to the docs/msw/install.txt. The console sample compiles and

docs/msw/install.txt

@@ -461,6 +461,10 @@ Notes:
    flagged when the program quits. You can use Cygwin gdb
    to debug MinGW executables.
 
+8. Note that gcc's precompiled headers do not work on current versions of
+   Cygwin. If your version of Cygwin is affected you will need to use the
+   --disable-precomp-headers configure option.
+
 OLD VERSIONS:
 
 - Modify the file wx/src/cygnus.bat (or mingw32.bat or mingegcs.bat)
@@ -545,11 +549,16 @@ Watcom C/C++:
 MinGW using native makefiles:
   > mingw32-make -f makefile.gcc BUILD=debug UNICODE=1
 
-MinGW using configure or Cygwin:
+MinGW using configure:
   > ./configure --enable-debug --enable-unicode
   (see ./configure --help on details; configure is not covered in this
   section)
 
+Cygwin using configure:
+  > ./configure --disable-precomp-headers --enable-debug --enable-unicode
+  (use --disable-precomp-headers if Cygwin doesn't support precompiled
+  headers)
+
 Brief explanation of options and possible values is in every
 build\msw\config.* file; more detailed description follows.
 

docs/univ/readme.txt

@@ -57,6 +57,10 @@ b) Cygwin
 
    Please refer to the Unix section below
 
+   Note that gcc's precompiled headers do not work on current versions of
+   Cygwin. If your version of Cygwin is affected you will need to use the
+   --disable-precomp-headers configure option.
+
 ** the instructions may be out of date as for wxWidgets 2.5.2+ **
 
 c) Other compilers