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| author | Kaveh R. Ghazi <ghazi@caip.rutgers.edu> | 2002-03-02 03:52:17 +0000 |
|---|---|---|
| committer | Kaveh Ghazi <ghazi@gcc.gnu.org> | 2002-03-02 03:52:17 +0000 |
| commit | 27b41650c178510367442f1a41b4c7a13915056d (patch) | |
| tree | 75fe6685e297fa2a98efab337e910c5a2c995d5f /gcc/doc | |
| parent | ca734b39f3a1dff4206545b43068998b2bf7821b (diff) | |
| download | gcc-27b41650c178510367442f1a41b4c7a13915056d.zip gcc-27b41650c178510367442f1a41b4c7a13915056d.tar.gz gcc-27b41650c178510367442f1a41b4c7a13915056d.tar.bz2 | |
Makefile.in (CRTSTUFF_CFLAGS): Add -fno-zero-initialized-in-bss.
* Makefile.in (CRTSTUFF_CFLAGS): Add -fno-zero-initialized-in-bss.
* doc/invoke.texi (-fno-zero-initialized-in-bss): Document.
* flags.h (flag_zero_initialized_in_bss): Declare.
* toplev.c (flag_zero_initialized_in_bss): New flag.
(lang_independent_options): Add flag_zero_initialized_in_bss.
* tree.c (initializer_zerop): New function.
* tree.h (initializer_zerop): Declare.
* varasm.c (assemble_variable): If we can emit bss, put zero
initializers in the bss section.
From-SVN: r50218
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 8dab7a0..10b69c8 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -273,6 +273,7 @@ in the following sections. -fno-function-cse -fno-guess-branch-probability @gol -fno-inline -fno-math-errno -fno-peephole -fno-peephole2 @gol -funsafe-math-optimizations -fno-trapping-math @gol +-fno-zero-initialized-in-bss @gol -fomit-frame-pointer -foptimize-register-move @gol -foptimize-sibling-calls -fprefetch-loop-arrays @gol -freduce-all-givs -fregmove -frename-registers @gol @@ -3407,6 +3408,19 @@ an exact implementation of IEEE or ISO rules/specifications for math functions. The default is @option{-ftrapping-math}. + +@item -fno-zero-initialized-in-bss +@opindex fno-zero-initialized-in-bss +If the target supports a BSS section, GCC by default puts variables that +are initialized to zero into BSS@. This can save space in the resulting +code. + +This option turns off this behavior because some programs explicitly +rely on variables going to the data section. E.g., so that the +resulting executable can find the beginning of that section and/or make +assumptions based on that. + +The default is @option{-fzero-initialized-in-bss}. @end table The following options control specific optimizations. The @option{-O2} |