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Diffstat (limited to 'gcc/doc/cppopts.texi')
| -rw-r--r-- | gcc/doc/cppopts.texi | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gcc/doc/cppopts.texi b/gcc/doc/cppopts.texi index b941de6df1b..a3bad58f6ab 100644 --- a/gcc/doc/cppopts.texi +++ b/gcc/doc/cppopts.texi @@ -266,6 +266,20 @@ standard versions) and C++. @opindex fno-canonical-system-headers When preprocessing, do not shorten system header paths with canonicalization. +@item -fno-header-guard-opt +@opindex fno-header-guard-opt +This disables the preprocessor's optimization of header files that +have a macro header-guard. Usually such files are do not appear at +all in the preprocessed output on their second and subsequent +inclusion. This disables that optimization such that they will appear +in the @code{#} line directive output, but of course their contents +will be elided by the controlling @code{#if} directive. This also +covers C++ 20 include-translated header-unit imports, those will be +subject to multiple include translations. This option is useful to +discover the complete #include graph of a translation unit. It does +not apply to idempotent headerfiles marked with @code{#pragma once}, +nor to headers read with @code{#import}. + @item -fmax-include-depth=@var{depth} @opindex fmax-include-depth Set the maximum depth of the nested #include. The default is 200. |