When compiling the recent proftpd-1.3.2rc1 source code using gcc-4.3.0, a user
reported a problem where gcc reports a problem with the -Wno-long-double
option:
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall
-Wno-long-double -c mod_sql.c
mod_sql.c: In function 'check_auth_openssl':
mod_sql.c:685: warning: pointer targets in passing argument 3 of
'EVP_DigestFinal' differ in signedness
mod_sql.c:688: warning: pointer targets in passing argument 1 of
'EVP_EncodeBlock' differ in signedness
At top level:
cc1: error: unrecognized command line option "-Wno-long-double"
make[1]: *** [mod_sql.o] Error 1
However, I verified that gcc-4.3.0 does in fact support -Wno-long-double,
using:
# echo 'void f(){}' > conftest.c
# gcc -c -Wno-long-double conftest.c 2>&1
# echo $?
0
So the error about "-Wno-long-double" appears to be misleading. In fact, a
fuller output from using gcc-4.3.0 for the proftpd-1.3.2rc1 source code shows
several successful gcc invocations with that option:
flecha:/usr/local/src/proftpd/proftpd-1.3.2rc1# make
echo \#define BUILD_STAMP \"`date`\" >include/buildstamp.h
cd lib/ && make lib
make[1]: Entering directory `/usr/local/src/proftpd/proftpd-1.3.2rc1/lib'
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c pr_fnmatch.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c sstrncpy.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c strsep.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c vsnprintf.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c glibc-glob.c
...
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c mod_ident.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c mod_auth_pam.c
gcc -DHAVE_CONFIG_H -DLINUX -I.. -I../include -I/usr/include/mysql -O2
-Wall -Wno-long-double -c mod_sql.c
mod_sql.c: In function 'check_auth_openssl':
mod_sql.c:685: warning: pointer targets in passing argument 3 of
'EVP_DigestFinal' differ in signedness
mod_sql.c:688: warning: pointer targets in passing argument 1 of
'EVP_EncodeBlock' differ in signedness
At top level:
cc1: error: unrecognized command line option "-Wno-long-double"
I suspect that the root problem was the warning about the signedness
discrepancy, and not the -Wno-long-double option at all.
For comparison, using gcc-4.2 works.
--
Summary: Erroneous error message using gcc-4.3.0 when signedness
warning thrown
Product: gcc
Version: 4.3.0
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: tj at castaglia dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35961
