djgpp.h: Add comments about standard paths.

[gcc.git] / gcc / flags.h

diff --git a/gcc/flags.h b/gcc/flags.h
index 6a87edb8e63b8cd61ba57822a8fc17190acf31ff..99678ba5755449a52158647811675434924b8724 100644 (file)
--- a/gcc/flags.h
+++ b/gcc/flags.h
@@ -79,6 +79,10 @@ extern int mem_report;
 
 extern int inhibit_warnings;
 
+/* Don't suppress warnings from system headers.  -Wsystem-headers.  */
+
+extern int warn_system_headers;
+
 /* Do print extra warnings (such as for uninitialized variables).  -W.  */
 
 extern int extra_warnings;
@@ -128,6 +132,10 @@ extern int warn_switch;
 
 extern int warn_return_type;
 
+/* Warn about functions which might be candidates for attribute noreturn. */
+
+extern int warn_missing_noreturn;
+
 /* Nonzero means warn about pointer casts that increase the required
    alignment of the target type (and might therefore lead to a crash
    due to a misaligned access).  */
@@ -184,6 +192,14 @@ extern int flag_test_coverage;
 
 extern int flag_branch_probabilities;
 
+/* Nonzero if basic blocks should be reordered.  */
+
+extern int flag_reorder_blocks;
+
+/* Nonzero if registers should be renamed.  */
+
+extern int flag_rename_registers;
+
 /* Nonzero for -pedantic switch: warn about anything
    that standard C forbids.  */
 
@@ -329,7 +345,7 @@ extern int flag_errno_math;
 
 /* 0 means straightforward implementation of complex divide acceptable.
    1 means wide ranges of inputs must work for complex divide.
-   2 means C9X-like requirements for complex divide (not yet implemented).  */
+   2 means C99-like requirements for complex divide (not yet implemented).  */
 
 extern int flag_complex_divide_method;
 
@@ -515,6 +531,9 @@ extern int flag_instrument_function_entry_exit;
 /* Perform a peephole pass before sched2. */
 extern int flag_peephole2;
 
+/* Try to guess branch probablities.  */
+extern int flag_guess_branch_prob;
+
 /* -fbounded-pointers causes gcc to compile pointers as composite
    objects occupying three words: the pointer value, the base address
    of the referent object, and the address immediately beyond the end
@@ -543,15 +562,14 @@ extern int flag_renumber_insns;
 
 extern int frame_pointer_needed;
 
-/* Set nonzero if jump_optimize finds that control falls through
-   at the end of the function.  */
-
-extern int can_reach_end;
-
 /* Nonzero if GCC must add code to check memory access (used by Checker).  */
 
 extern int flag_check_memory_usage;
 
+/* Nonzero if the generated code should trap on signed overflow
+   for PLUS / SUB / MULT.  */
+extern int flag_trapv;
+
 /* Nonzero if GCC must prefix function names (used with
    flag_check_memory_usage).  */