| Summary: | sys-devel/gcc-4.3.4 -ffast-math option leads to undefined symbol | ||
|---|---|---|---|
| Product: | Gentoo Linux | Reporter: | Hugo Mildenberger <Hugo.Mildenberger> |
| Component: | Hardened | Assignee: | The Gentoo Linux Hardened Team <hardened> |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | ||
| Priority: | High | ||
| Version: | unspecified | ||
| Hardware: | x86 | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Package list: | Runtime testing required: | --- | |
*** This bug has been marked as a duplicate of bug 288977 *** |
Compiling mesa on hardened ~x86, configure bailed out stating that gcc could not produce executables. It turned out that any attempt to compile a program using the -ffast-math option leads to an undefined symbol error: gcc -ffast-math test.c -o test /usr/lib/gcc/i686-pc-linux-gnu/4.3.4/crtfastmath.o:(.ctors+0x0): undefined reference to `no symbol' collect2: ld gab 1 als Ende-Status zurück $ gcc -ffast-math test.c -o test.o -c $ readelf -s test.o Symbol table '.symtab' contains 14 entries: Num: Value Size Type Bind Vis Ndx Name 0: 00000000 0 NOTYPE LOCAL DEFAULT UND 1: 00000000 0 FILE LOCAL DEFAULT ABS test.c 2: 00000000 0 SECTION LOCAL DEFAULT 2 3: 00000000 0 SECTION LOCAL DEFAULT 4 4: 00000000 0 SECTION LOCAL DEFAULT 5 5: 00000000 0 SECTION LOCAL DEFAULT 6 6: 00000000 0 SECTION LOCAL DEFAULT 8 7: 00000000 0 SECTION LOCAL DEFAULT 9 8: 00000000 0 SECTION LOCAL DEFAULT 7 9: 00000000 0 SECTION LOCAL DEFAULT 1 10: 00000000 58 FUNC GLOBAL DEFAULT 2 main 11: 00000000 0 FUNC GLOBAL HIDDEN 8 __i686.get_pc_thunk.bx 12: 00000000 0 NOTYPE GLOBAL DEFAULT UND _GLOBAL_OFFSET_TABLE_ 13: 00000000 0 NOTYPE GLOBAL DEFAULT UND puts There shouldn't be any FP-operation in test.c: include <stdio.h> int main() { printf("hello world\n"); return 0; } Linking -lm explictly doesn't help. The generated assembly and object files are identical, with and without-ffast-math, while only the link without -ffast-math succeeds. I use sys-devel/binutils-2.19-r1.