http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56647
Bug #: 56647 Summary: use return value of malloc() as initializer Classification: Unclassified Product: gcc Version: 4.7.2 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassig...@gcc.gnu.org ReportedBy: zhabgyuan1...@gmail.com Created attachment 29687 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29687 the preprocessed file for r.c $:cat r.c ------------------------------------------------------ #include<stdio.h> #include<stdlib.h> int *c; c = (int *)malloc(sizeof(int)); int main(void) { return 0; } error or warning ------------------------------------------------------- r.c:4:1: warning: data definition has no type or storage class [enabled by default] r.c:4:1: error: conflicting types for ‘c’ r.c:3:6: note: previous declaration of ‘c’ was here r.c:4:5: warning: initialization makes integer from pointer without a cast [enabled by default] r.c:4:1: error: initializer element is not constant $: gcc -v -save-temps r.c ------------------------------------------------------- Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.2-2ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1 -E -quiet -v -imultiarch x86_64-linux-gnu r.c -mtune=generic -march=x86-64 -fpch-preprocess -fstack-protector -o r.i ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu" ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/4.7/../../../../x86_64-linux-gnu/include" #include "..." search starts here: #include <...> search starts here: /usr/lib/gcc/x86_64-linux-gnu/4.7/include /usr/local/include /usr/lib/gcc/x86_64-linux-gnu/4.7/include-fixed /usr/include/x86_64-linux-gnu /usr/include End of search list. COLLECT_GCC_OPTIONS='-v' '-save-temps' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/4.7/cc1 -fpreprocessed r.i -quiet -dumpbase r.c -mtune=generic -march=x86-64 -auxbase r -version -fstack-protector -o r.s GNU C (Ubuntu/Linaro 4.7.2-2ubuntu1) version 4.7.2 (x86_64-linux-gnu) compiled by GNU C version 4.7.2, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU C (Ubuntu/Linaro 4.7.2-2ubuntu1) version 4.7.2 (x86_64-linux-gnu) compiled by GNU C version 4.7.2, GMP version 5.0.2, MPFR version 3.1.0-p3, MPC version 0.9 GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 Compiler executable checksum: efa32fef7aa241fa03ac6d7ad2a4a2cf r.c:4:1: warning: data definition has no type or storage class [enabled by default] r.c:4:1: error: conflicting types for ‘c’ r.c:3:6: note: previous declaration of ‘c’ was here r.c:4:5: warning: initialization makes integer from pointer without a cast [enabled by default] r.c:4:1: error: initializer element is not constant