gcc に -v オプションをつければよいみたい。
$ gcc -v -c hoge.c Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --enable-languages=c,c++ --disable-libgcj --host=i386-redhat-linux Thread model: posix gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-47.3) /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/cc1 -lang-c -v -D__GNUC__=3 -D__GNUC_MINOR__=2 -D__GNUC_PATCHLEVEL__=3 -D__GXX_ABI_VERSION=102 -D__ELF__ -Dunix -D__gnu_linux__ -Dlinux -D__ELF__ -D__unix__ -D__gnu_linux__ -D__linux__ -D__unix -D__linux -Asystem=posix -D__NO_INLINE__ -D__STDC_HOSTED__=1 -Acpu=i386 -Amachine=i386 -Di386 -D__i386 -D__i386__ -D__tune_i386__ hoge.c -quiet -dumpbase hoge.c -version -o /tmp/ccQ5Ldci.s GNU CPP version 3.2.3 20030502 (Red Hat Linux 3.2.3-47.3) (cpplib) (i386 Linux/ELF) GNU C version 3.2.3 20030502 (Red Hat Linux 3.2.3-47.3) (i386-redhat-linux) compiled by GNU C version 3.2.3 20030502 (Red Hat Linux 3.2.3-47.3). ignoring nonexistent directory "/usr/i386-redhat-linux/include" #include "..." search starts here: #include <...> search starts here: /usr/local/include /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/include /usr/include End of search list. as -V -Qy -o hoge.o /tmp/ccQ5Ldci.s GNU assembler version 2.15.92.0.2 (i386-redhat-linux) using BFD version 2.15.92.0.2 20040927
