msys/mingw warnings about string length and putenv absence with gcc -Wall -ansi

[Chris Pickett]

Hi,

If I compile my project on MSYS/MinGW with gcc -Wall -ansi (plus other 
warning stuff that shouldn't matter here) I get two unexpected warnings. 
 Problem 1 is string lengths that are too long, problem 2 is a missing 
putenv declaration.  Based on a previous bug report, it seems the string 
lengths were fixed already for C99's more generous limit, so presumably 
a C89 fix can follow the same process.  As for putenv, it exists on 
mingw but -ansi hides it, so maybe some use of #if !HAVE_DECL_PUTENV and 
a declaration somewhere can fix it (this works in my own project).
gcc -DHAVE_CONFIG_H -I. -I..  -I../src   -g -O2 -Wall -ansi -pedantic 
-Wextra -Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -MT 
ex_log_output.o -MD -MP -MF .deps/ex_log_output.Tpo -c -o 
ex_log_output.o ex_log_output.c
In file included from ex_log_output.c:6:
../src/check.h:211:27: warning: anonymous variadic macros were 
introduced in C99
../src/check.h:222:23: warning: anonymous variadic macros were 
introduced in C99
../src/check.h:227:14: warning: anonymous variadic macros were 
introduced in C99
mv -f .deps/ex_log_output.Tpo .deps/ex_log_output.Po
/bin/sh ../libtool --tag=CC   --mode=link gcc  -g -O2 -Wall -ansi 
-pedantic -Wextra -Wstrict-prototypes -Wmissing-prototypes 
-Wwrite-strings   -o ex_log_output.exe ex_log_output.o 
../src/libcheck.la ../lib/libcompat.la
libtool: link: gcc -g -O2 -Wall -ansi -pedantic -Wextra 
-Wstrict-prototypes -Wmissing-prototypes -Wwrite-strings -o 
.libs/ex_log_output.exe ex_log_output.o  ../src/.libs/libcheck.dll.a 
../lib/.libs/libcompat.a -L/usr/local/lib
./.libs/lt-ex_log_output.c:229: warning: string length `2671' is greater 
than the length `509' ISO C89 compilers are required to support
./.libs/lt-ex_log_output.c:285: warning: string length `1565' is greater 
than the length `509' ISO C89 compilers are required to support
./.libs/lt-ex_log_output.c: In function `lt_setenv':
./.libs/lt-ex_log_output.c:783: warning: implicit declaration of 
function `putenv'
Cheers,
Chris

P.S.  The anonymous variadic macros warning is something I cannot turn 
off with gcc-3.4.5, the current mingw compiler.
P.P.S.  Thanks Autotools people for bearing with me as I port something 
to Windows for the first time.