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WARNING: fcntl.h: present but cannot be compiled
From: |
Jason Gross |
Subject: |
WARNING: fcntl.h: present but cannot be compiled |
Date: |
Wed, 13 May 2020 20:08:37 -0400 |
When using cygin, if I download cygwin's source package for
patch-2.7.4 and configure with `./configure -prefix "$(pwd)/bin/"
CFLAGS="-I/usr/include"`, I get the error:
configure: WARNING: fcntl.h: present but cannot be compiled
configure: WARNING: fcntl.h: check for missing prerequisite headers?
configure: WARNING: fcntl.h: see the Autoconf documentation
configure: WARNING: fcntl.h: section "Present But Cannot Be Compiled"
configure: WARNING: fcntl.h: proceeding with the compiler's result
configure: WARNING: ## -------------------------------- ##
configure: WARNING: ## Report this to address@hidden ##
configure: WARNING: ## -------------------------------- ##
I'm reporting this as requested.
Note that if I don't pass these CFLAGS, then I don't get this warning,
and instead get
checking fcntl.h usability... yes
checking fcntl.h presence... yes
but then I get
x86_64-w64-mingw32-gcc.exe -DHAVE_CONFIG_H -I. -I.. -I../lib -I../lib
-DENABLE_MERGE -g -O2 -MT safe.o -MD -MP -MF .deps/safe.Tpo -c -o
safe.o safe.c
safe.c:24:10: fatal error: sys/resource.h: No such file or directory
24 | #include <sys/resource.h>
| ^~~~~~~~~~~~~~~~
compilation terminated.
make[2]: *** [Makefile:1163: safe.o] Error 1
when building
However, if I do pass these CFLAGS, then I get
make[3]: Entering directory '/cygdrive/d/patch-2.7.4/lib'
CC argmatch.o
In file included from argmatch.c:22:
../config.h:1798:15: error: two or more data types in declaration specifiers
1798 | #define off_t long int
| ^~~~
../config.h:1798:20: error: two or more data types in declaration specifiers
1798 | #define off_t long int
| ^~~
../config.h:1792:16: error: two or more data types in declaration specifiers
1792 | #define mode_t int
| ^~~
/usr/x86_64-w64-mingw32/sys-root/mingw/include/sys/types.h:77:17:
note: in expansion of macro 'mode_t'
77 | typedef _mode_t mode_t;
| ^~~~~~
In file included from ./sys/types.h:28,
from ./stdio.h:58,
from argmatch.c:28:
/usr/x86_64-w64-mingw32/sys-root/mingw/include/sys/types.h:77:1:
warning: useless type name in empty declaration
77 | typedef _mode_t mode_t;
| ^~~~~~~
make[3]: *** [Makefile:1382: argmatch.o] Error 1
make[3]: Leaving directory '/cygdrive/d/patch-2.7.4/lib'
so overall patch seems to be unbuildable on cygwin.
-Jason
- WARNING: fcntl.h: present but cannot be compiled,
Jason Gross <=