| Summary: | Name 'DOMAIN' is blocked when including math.h | ||
|---|---|---|---|
| Product: | gcc | Reporter: | henad221 |
| Component: | c | Assignee: | Not yet assigned to anyone <unassigned> |
| Status: | RESOLVED INVALID | ||
| Severity: | minor | CC: | jakub |
| Priority: | P3 | ||
| Version: | 4.8.5 | ||
| Target Milestone: | --- | ||
| Host: | Target: | ||
| Build: | Known to work: | ||
| Known to fail: | Last reconfirmed: | ||
What do you expect? Just use a different variable name. First of all, note that math.h header comes from the C library, not GCC, so likely glibc in your case. And, please learn about Feature Test Macros that affect the namespace. DOMAIN is part of SVID support, is included in e.g. _DEFAULT_SOURCE or _GNU_SOURCE. So e.g. if you compile with -D_XOPEN_SOURCE=700 or various others, DOMAIN will not be visible. Thanks for quick reply. I didn't expect the name DOMAIN to be used by something when including math.h. Thanks to Jakub for an explanation of what is happening, next time I will try to dig more into these kinds of issues before posting it as a bug. |
#include <math.h> #include <stdio.h> int DOMAIN = 3; int main() { printf("%d\n", DOMAIN); return 0; } Compiled with: gcc -v domain.cpp Produces: gcc -v domain.cpp Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-linux-gnu/4.8/lto-wrapper Target: i686-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.8.5-2ubuntu1~14.04.1' --with-bugurl=file:///usr/share/doc/gcc-4.8/README.Bugs --enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.8 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.8 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-4.8-i386 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.8-i386 --with-arch-directory=i386 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-targets=all --enable-multiarch --disable-werror --with-arch-32=i686 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=i686-linux-gnu --host=i686-linux-gnu --target=i686-linux-gnu Thread model: posix gcc version 4.8.5 (Ubuntu 4.8.5-2ubuntu1~14.04.1) COLLECT_GCC_OPTIONS='-v' '-mtune=generic' '-march=i686' /usr/lib/gcc/i686-linux-gnu/4.8/cc1plus -quiet -v -imultiarch i386-linux-gnu -D_GNU_SOURCE domain.cpp -quiet -dumpbase domain.cpp -mtune=generic -march=i686 -auxbase domain -version -fstack-protector -Wformat -Wformat-security -o /tmp/ccDxzNcb.s GNU C++ (Ubuntu 4.8.5-2ubuntu1~14.04.1) version 4.8.5 (i686-linux-gnu) compiled by GNU C version 4.8.5, GMP version 5.1.3, MPFR version 3.1.3, MPC version 1.0.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 ignoring duplicate directory "/usr/include/i386-linux-gnu/c++/4.8" ignoring nonexistent directory "/usr/local/include/i386-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/i686-linux-gnu/4.8/../../../../i686-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /home/dyknowaccount/ros_catkin_ws/install_isolated/include /usr/include/c++/4.8 /usr/include/i386-linux-gnu/c++/4.8 /usr/include/c++/4.8/backward /usr/lib/gcc/i686-linux-gnu/4.8/include /usr/local/include /usr/lib/gcc/i686-linux-gnu/4.8/include-fixed /usr/include/i386-linux-gnu /usr/include End of search list. GNU C++ (Ubuntu 4.8.5-2ubuntu1~14.04.1) version 4.8.5 (i686-linux-gnu) compiled by GNU C version 4.8.5, GMP version 5.1.3, MPFR version 3.1.3, MPC version 1.0.1 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: 0603886523ce76985a8d2b2a7d22cd38 In file included from domain.cpp:1:0: domain.cpp:4:5: error: expected unqualified-id before numeric constant int DOMAIN = 3; ^