Compiling a file which #include's <sys/signal.h> in C89 mode fails:
$ echo "#include <sys/signal.h>" > test.c
$ gcc -c test.c
$ gcc -c -std=c89 test.c
In file included from /usr/include/sys/signal.h:107,
from test.c:1:
/usr/include/cygwin/signal.h:74: error: expected
specifier-qualifier-list before 'pthread_attr_t'
/usr/include/cygwin/signal.h:80: error: expected
specifier-qualifier-list before '__uint32_t'
/usr/include/cygwin/signal.h:96: error: expected
specifier-qualifier-list before 'pid_t'
/usr/include/cygwin/signal.h:270: error: expected ')' before 'int'
In file included from test.c:1:
/usr/include/sys/signal.h:152: error: expected ')' before 'int'
The problem is that both <cygwin/signal.h> and an #ifdef __CYGWIN__
section of <sys/signal.h> need those typedefs from <sys/types.h>, but
the latter is only #include'd #ifdef _POSIX_THREADS, which is off in C89
mode.
I see two possible solutions:
1) Unconditionally #include <sys/types.h> in <sys/signal.h> (newlib), OR
2) #include <sys/types.h> in <cygwin/signal.h>.
Since this appears to be Cygwin specific, I went for the latter. Patch
attached.
Yaakov
2009-09-29 Yaakov Selkowitz <yselkow...@users.sourceforge.net>
* include/cygwin/signal.h: #include <sys/types.h> to fix compilation
with --std=c89.
Index: include/cygwin/signal.h
===================================================================
RCS file: /cvs/src/src/winsup/cygwin/include/cygwin/signal.h,v
retrieving revision 1.17
diff -u -r1.17 signal.h
--- include/cygwin/signal.h 11 Sep 2008 06:22:31 -0000 1.17
+++ include/cygwin/signal.h 29 Sep 2009 19:28:10 -0000
@@ -14,6 +14,9 @@
#ifdef __cplusplus
extern "C" {
#endif
+
+#include <sys/types.h>
+
struct _fpstate
{
unsigned long cw;
