gcc-3.4 introduced a syntax for compilation with inter-module analysis:
$ gcc -c foo1.c foo2.c -o foo.o
gcc-4.0 performs the same with the command-line option -combine:
$ gcc -combine -c foo1.c foo2.c -o foo.o
But Makefiles that have already switched to using the gcc-3.4 invocation
convention are trapped: gcc-4.0, when invoked without -combine, ignores
all input files except the last one.
$ cat foo1.c
int foo1 (int x) { return 17 * x; }
$ cat foo2.c
int foo2 (int x) { return 42 * x; }
$ gcc -v
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../gcc-4.0.0/configure
--prefix=/home/haible/gnu/arch/linuxgcc40
--enable-shared --enable-threads --enable-__cxa_atexit
--enable-languages=c,c++,java,objc --enable-nls
Thread model: posix
gcc version 4.0.0
$ gcc -c foo1.c foo2.c -o foo.o && nm foo.o
00000000 T foo2
Expected result: An error, as with gcc-3.3:
$ gcc -c foo1.c foo2.c -o foo.o && nm foo.o
gcc: cannot specify -o with -c or -S and multiple compilations
--
Summary: gcc ignores input file given on the command line
Product: gcc
Version: 4.0.0
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: driver
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: bruno at clisp dot org
CC: gcc-bugs at gcc dot gnu dot org
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22544
