https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67094
Bug ID: 67094
Summary: Compiling and linking through compiler driver with '-x
c++' fails to link with stream of errors
Product: gcc
Version: 5.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: noloader at gmail dot com
Target Milestone: ---
When compiling the Crypto++ library with CXXFLAGS that includes `-x c++`, the
test program fails at linking. Without the CXXFLAGS, the program does not have
a problem with compiling and linking.
Below is the tail of linking the test program (cryptest.exe).
g++ -x c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra -Wno-type-limits
-Wno-unknown-pragmas -pipe -c dlltest.cpp
g++ -o cryptest.exe -x c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra
-Wno-type-limits -Wno-unknown-pragmas -pipe bench.o bench2.o test.o validat0.o
validat1.o validat2.o validat3.o adhoc.o datatest.o regtest.o fipsalgt.o
dlltest.o ./libcryptopp.a -pthread
bench.o:1:1: error: stray ‘\177’ in program
ELF > � @ @ � � B C
^
bench.o:1:1: error: stray ‘\2’ in program
bench.o:1:1: error: stray ‘\1’ in program
bench.o:1:1: error: stray ‘\1’ in program
bench.o:1:1: error: stray ‘\3’ in program
[stream of problems...]
**********
I can't duplicate this with a simple test program, but I can offer a test case.
I tried to duplicate with/without symbols, PIC, NDEBUG and optimization.
To duplicate:
$ git clone https://github.com/weidai11/cryptopp.git cryptopp
$ cd cryptopp
$ export CXXFLAGS="-x c++"
$ make
g++ -x c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra -Wno-type-limits
-Wno-unknown-pragmas -pipe -c randpool.cpp
g++ -x c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra -Wno-type-limits
-Wno-unknown-pragmas -pipe -c base32.cpp
...
g++ -o cryptest.exe -x c++ -DNDEBUG -g2 -O3 -fPIC -march=native -Wall -Wextra
-Wno-type-limits -Wno-unknown-pragmas -pipe bench.o bench2.o test.o validat0.o
validat1.o validat2.o validat3.o adhoc.o datatest.o regtest.o fipsalgt.o
dlltest.o ./libcryptopp.a -pthread
[stream of problems...]
**********
$ uname -a
Linux localhost.localdomain 4.1.3-200.fc22.x86_64 #1 SMP Wed Jul 22 19:51:58
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/5.1.1/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap
--enable-languages=c,c++,objc,obj-c++,fortran,ada,go,lto --prefix=/usr
--mandir=/usr/share/man --infodir=/usr/share/info
--with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared
--enable-threads=posix --enable-checking=release --enable-multilib
--with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions
--enable-gnu-unique-object --enable-linker-build-id
--with-linker-hash-style=gnu --enable-plugin --enable-initfini-array
--disable-libgcj --with-default-libstdcxx-abi=c++98 --with-isl --enable-libmpx
--enable-gnu-indirect-function --with-tune=generic --with-arch_32=i686
--build=x86_64-redhat-linux
Thread model: posix
gcc version 5.1.1 20150618 (Red Hat 5.1.1-4) (GCC)
