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| author | Zack Weinberg <zack@wolery.cumb.org> | 2000-05-17 18:07:16 +0000 |
|---|---|---|
| committer | Zack Weinberg <zack@gcc.gnu.org> | 2000-05-17 18:07:16 +0000 |
| commit | 2c0b35cb894747518533852e3a60cde8a8e6250b (patch) | |
| tree | 9be6e344dab33858e4721bbe595b287ff04e34ee /gcc/cpplib.c | |
| parent | 3f69bd930cb156f6b33e8e9d2126c1f956849370 (diff) | |
| download | gcc-2c0b35cb894747518533852e3a60cde8a8e6250b.zip gcc-2c0b35cb894747518533852e3a60cde8a8e6250b.tar.gz gcc-2c0b35cb894747518533852e3a60cde8a8e6250b.tar.bz2 | |
cpplib.c: New feature, #pragma system_header.
* cpplib.c: New feature, #pragma system_header.
* cpp.texi: Document special treatment of system headers, and
the various mechanisms to get a header that special treatment.
From-SVN: r33962
Diffstat (limited to 'gcc/cpplib.c')
| -rw-r--r-- | gcc/cpplib.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/cpplib.c b/gcc/cpplib.c index c4b6aa4..e249555 100644 --- a/gcc/cpplib.c +++ b/gcc/cpplib.c @@ -811,6 +811,7 @@ do_ident (pfile) static int do_pragma_once PARAMS ((cpp_reader *)); static int do_pragma_implementation PARAMS ((cpp_reader *)); static int do_pragma_poison PARAMS ((cpp_reader *)); +static int do_pragma_system_header PARAMS ((cpp_reader *)); static int do_pragma_default PARAMS ((cpp_reader *)); static int @@ -846,6 +847,8 @@ do_pragma (pfile) pop = do_pragma_implementation (pfile); else if (tokis ("poison")) pop = do_pragma_poison (pfile); + else if (tokis ("system_header")) + pop = do_pragma_system_header (pfile); else pop = do_pragma_default (pfile); #undef tokis @@ -979,6 +982,25 @@ do_pragma_poison (pfile) } return !writeit; } + +/* Mark the current header as a system header. This will suppress + some categories of warnings (notably those from -pedantic). It is + intended for use in system libraries that cannot be implemented in + conforming C, but cannot be certain that their headers appear in a + system include directory. To prevent abuse, it is rejected in the + primary source file. */ +static int +do_pragma_system_header (pfile) + cpp_reader *pfile; +{ + cpp_buffer *ip = cpp_file_buffer (pfile); + if (CPP_PREV_BUFFER (ip) == NULL) + cpp_warning (pfile, "#pragma system_header outside include file"); + else + ip->system_header_p = 1; + + return 1; +} /* Just ignore #sccs, on systems where we define it at all. */ #ifdef SCCS_DIRECTIVE |