[newlib-cygwin] Cygwin: Makefile.in: add -fno-builtin-execve CFLAG when building exec.o
Corinna Vinschen
corinna@sourceware.org
Wed Feb 26 16:06:00 GMT 2020
https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=5f66c2c756c2b3b43e565e471c82ee4ed05a4adb
commit 5f66c2c756c2b3b43e565e471c82ee4ed05a4adb
Author: Corinna Vinschen <corinna@vinschen.de>
Date: Wed Feb 26 17:02:01 2020 +0100
Cygwin: Makefile.in: add -fno-builtin-execve CFLAG when building exec.o
gcc-9.2.0 has an execve builtin which uses the nothrow attribute.
This results in an error when aliasing execve to _execve for newlib:
exec.cc:88:23: error: 'int _execve(const char*, char* const*, char*
const*)' specifies less restrictive attribute than its target
'int execve(const char*, char* const*, char* const*)': 'nothrow'
[-Werror=missing-attributes]
88 | EXPORT_ALIAS (execve, _execve) /* For newlib */
Add the -fno-builtin-execve CFLAGS when building exec.o to override
the gcc builtin.
Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
Diff:
---
winsup/cygwin/Makefile.in | 2 ++
1 file changed, 2 insertions(+)
diff --git a/winsup/cygwin/Makefile.in b/winsup/cygwin/Makefile.in
index ca0633e..f273ba7 100644
--- a/winsup/cygwin/Makefile.in
+++ b/winsup/cygwin/Makefile.in
@@ -567,6 +567,8 @@ ifeq ($(target_cpu),i686)
exceptions_CFLAGS:=-fno-omit-frame-pointer
endif
endif
+# required since gcc 9.x
+exec_CFLAGS:=-fno-builtin-execve
fhandler_proc_CFLAGS+=-DUSERNAME="\"$(USER)\"" -DHOSTNAME="\"$(HOSTNAME)\""
fhandler_proc_CFLAGS+=-DGCC_VERSION="\"`$(CC) -v 2>&1 | tail -n 1`\""
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