http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57531
Bug ID: 57531 Summary: lvalue required with comma operator Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: vijunag at gmail dot com Following expression cannot be compiled using gcc-4.7.2 where as the same statement is perfectly acceptable by gcc version 4.4.5 (void) 0, a = b; [vinag]$ ~/tools/bintools/linux-x86/gcc/201302221200/bin/i686-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=~/tools/bintools/linux-x86/gcc/201302221200/bin/i686-pc-linux-gnu-gcc-wrapped COLLECT_LTO_WRAPPER=~/tools/bintools/linux-x86/gcc/201302221200/libexec/gcc/i686-pc-linux-gnu/4.7.2/lto-wrapper Target: i686-pc-linux-gnu Configured with: ../../gcc/configure --build=amd64-pc-linux-gnu --host=amd64-pc-linux-gnu --target=i686-pc-linux-gnu --enable-languages=c,c++ --prefix=/ws/vinag-bgl/tools/bintools/linux-x86/gcc/201302221200 --enable-shared --with-headers=/tmp/201302221200/new_header/ --disable-libquadmath --disable-libgomp --disable-libssp --disable-libmudflap --disable-libitm --with-fast-fixincludes --enable-threads --site=starent --with-gnu-as --with-gnu-ld Thread model: posix gcc version 4.7.2 (GCC) Program: vijay:/home/vijay]$ cat ternary.c #include <stdio.h> int main() { int a; (void )0, a = 4; } [vijay]i686-pc-linux-gnu-gcc lvalue.cpp -c lvalue.cpp: In function ‘void lvalue_assignment()’: lvalue.cpp:6:27: error: lvalue required as left operand of assignment vijay:/home/vijay]$ gcc ternary.c -o ternary.c.out vijay:/home/vijay]$ gcc -v Using built-in specs. Target: i686-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.4.4-14ubuntu5' --with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.4 --enable-shared --enable-multiarch --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.4 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-targets=all --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu Thread model: posix gcc version 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5)