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| author | Luboš Luňák <l.lunak@suse.cz> | 2013-07-16 09:53:29 +0200 |
|---|---|---|
| committer | Luboš Luňák <l.lunak@suse.cz> | 2013-07-16 09:58:39 +0200 |
| commit | afb41ff0c5bfc5402c1a5522a55998d6c023b248 (patch) | |
| tree | d89035410119187b08166279c080962e7dfe81f0 /configure.ac | |
| parent | 56f484fd648b459b32842b66c32f8945115ed509 (diff) | |
warn in configure about using ccache+clang without CCACHE_CPP2 set
- causes warnings about unused -I options, because they are preprocessing options
and Clang complains that they are unused in pure compilation
- Clang supresses some warnings from expansions of macros in system headers, but those
would be already expanded and thus warned about
- Clang prints relevant source lines with errors/warnings in them and would show
them preprocessed (this should actually apply to GCC4.8+ too)
Change-Id: I02c86c43a657d078e347e4ecd5c1e2ff07db2886
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index cc439e08a9a3..365391d205ee 100644 --- a/configure.ac +++ b/configure.ac @@ -2896,6 +2896,13 @@ if test "$GCC" = "yes"; then fi AC_SUBST(COM_GCC_IS_CLANG) +if test "$CCACHE" != "" -a "$COM_GCC_IS_CLANG" = TRUE; then + if test -z "$CCACHE_CPP2"; then + AC_MSG_WARN([Using ccache with Clang without CCACHE_CPP2 set causes spurious warnings.]) + add_warning "Using ccache with Clang without CCACHE_CPP2 set causes spurious warnings." + fi +fi + # =================================================================== # check various GCC options that Clang does not support now but maybe # will somewhen in the future, check them even for GCC, so that the |