https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85504
Bug ID: 85504
Summary: Bogus -Wrestrict warning with -fsanitize=undefined
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
Target Milestone: ---
Created attachment 44008
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44008&action=edit
unreduced test case
This happens with current openssl trunk revision:
./config -fsanitize=undefined --strict-warnings
$ gcc -I. -Icrypto/include -Iinclude -fPIC -pthread -m64 -Wa,--noexecstack
-DDEBUG_UNUSED -DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra
-Wno-unused-parameter -Wno-missing-field-initializers -Wswitch -Wsign-compare
-Wmissing-prototypes -Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3
-fsanitize=undefined -DOPENSSL_USE_NODELETE -DL_ENDIAN -DOPENSSL_PIC
-DOPENSSL_CPUID_OBJ -DOPENSSL_IA32_SSE2 -DOPENSSL_BN_ASM_MONT
-DOPENSSL_BN_ASM_MONT5 -DOPENSSL_BN_ASM_GF2m -DSHA1_ASM -DSHA256_ASM
-DSHA512_ASM -DRC4_ASM -DMD5_ASM -DAES_ASM -DVPAES_ASM -DBSAES_ASM -DGHASH_ASM
-DECP_NISTZ256_ASM -DX25519_ASM -DPADLOCK_ASM -DPOLY1305_ASM
-DOPENSSLDIR="\"/usr/local/ssl\"" -DENGINESDIR="\"/usr/local/lib/engines-1.1\""
-DNDEBUG -MMD -MF crypto/engine/eng_ctrl.d.tmp -MT crypto/engine/eng_ctrl.o -c
-o crypto/engine/eng_ctrl.o crypto/engine/eng_ctrl.c
crypto/engine/eng_ctrl.c: In function 'ENGINE_ctrl':
crypto/engine/eng_ctrl.c:110:23: error: 'strcpy' source argument is the same as
destination [-Werror=restrict]
return strlen(strcpy(s, cdp->cmd_name));
^~~~~~~~~~~~~~~~~~~~~~~~
while I can use -save-temps with this one (see attached test case)
there is another file which does not show the error with -save-temps:
$ gcc -I. -Iinclude -Iapps -pthread -m64 -Wa,--noexecstack -DDEBUG_UNUSED
-DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -Wswitch -Wsign-compare -Wmissing-prototypes
-Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3 -fsanitize=undefined
-DNDEBUG -MMD -MF apps/s_client.d.tmp -MT apps/s_client.o -c -o
apps/s_client.o apps/s_client.c
In file included from /usr/include/string.h:635,
from apps/s_client.c:15:
apps/s_client.c: In function 's_client_main':
apps/s_client.c:2585:13: error: '__builtin_strncpy' source argument is the same
as destination [-Werror=restrict]
strncpy(sbuf, mbuf, 2);
^~~~~~~
$ gcc -I. -Iinclude -Iapps -pthread -m64 -Wa,--noexecstack -DDEBUG_UNUSED
-DPEDANTIC -pedantic -Wno-long-long -Wall -Wextra -Wno-unused-parameter
-Wno-missing-field-initializers -Wswitch -Wsign-compare -Wmissing-prototypes
-Wshadow -Wformat -Wtype-limits -Wundef -Werror -Wall -O3 -fsanitize=undefined
-DNDEBUG -MMD -MF apps/s_client.d.tmp -MT apps/s_client.o -c -o
apps/s_client.o apps/s_client.c -save-temps
