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Missing <stdlib.h> include in lib/autoconf/c.m4

From: Sam James
Subject: Missing <stdlib.h> include in lib/autoconf/c.m4
Date: Sat, 5 Nov 2022 05:07:27 +0000


When working on Clang 16 (and presumably GCC 14) porting [0], I noticed the 
when building GNU grep 3.8:
configure:6215: checking for clang-16 option to enable C11 features
configure:6230: clang-16  -c -g -O2  conftest.c >&5
conftest.c:26:14: warning: a function definition without a prototype is 
deprecated in all versions of C and is not supported in C2x 
static char *e (p, i)
conftest.c:246:3: error: call to undeclared library function 'free' with type 
'void (void *)'; ISO C99 and later do not support implicit function 
declarations [-Wimplicit-function-declaration]
  free (ia);
conftest.c:246:3: note: include the header <stdlib.h> or explicitly provide a 
declaration for 'free'
1 warning and 1 error generated.

Tracing it through, it looks like there's a missing <stdlib.h> include for 
free() in autoconf's lib/autoconf/c.m4 (_AC_C_C99_TEST_GLOBALS).

[0] https://lwn.net/Articles/913505/


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