diff options
| -rw-r--r-- | doc/manual.cli | 13 | ||||
| -rw-r--r-- | libbuild2/cc/common.cxx | 2 | ||||
| -rw-r--r-- | libbuild2/cc/pkgconfig.cxx | 4 |
3 files changed, 18 insertions, 1 deletions
diff --git a/doc/manual.cli b/doc/manual.cli index bd06809..525d74e 100644 --- a/doc/manual.cli +++ b/doc/manual.cli @@ -1732,6 +1732,19 @@ will appear last on the command lines. For example: $ b configure config.cxx=\"g++ -m32\" \ +The compiler mode options are also the correct place to specify +\i{system-like} header (\c{-I}) and library (\c{-L}, \c{/LIBPATH}) search +paths. Where by system-like we mean common installation directories like +\c{/usr/include} or \c{/usr/local/lib} which may contain older versions of the +libraries we are trying to build and/or use. By specifying these paths as part +of the mode options (as opposed to \c{config.*.poptions} and +\c{config.*.loptions}) we make sure they will be considered last, similar to +the compiler's build-in search paths. For example: + +\ +$ b configure config.cxx=\"g++ -L/opt/install\" +\ + | We can also configure out of source builds of our projects. In this case, diff --git a/libbuild2/cc/common.cxx b/libbuild2/cc/common.cxx index b949c2b..6030954 100644 --- a/libbuild2/cc/common.cxx +++ b/libbuild2/cc/common.cxx @@ -1040,6 +1040,8 @@ namespace build2 gcc_extract_library_search_dirs (v, r); }; + // Note that the compiler mode options are in sys_lib_dirs. + // if (auto l = bs[c_loptions]) extract (*l, c_loptions); if (auto l = bs[x_loptions]) extract (*l, x_loptions); diff --git a/libbuild2/cc/pkgconfig.cxx b/libbuild2/cc/pkgconfig.cxx index 3e25167..5d5a43c 100644 --- a/libbuild2/cc/pkgconfig.cxx +++ b/libbuild2/cc/pkgconfig.cxx @@ -74,7 +74,9 @@ namespace build2 #ifndef BUILD2_BOOTSTRAP // Load package information from a .pc file. Filter out the -I/-L options - // that refer to system directories. + // that refer to system directories. This makes sure all the system search + // directories are "pushed" to the back which minimizes the chances of + // picking up wrong (e.g., old installed version) header/library. // // Note that the prerequisite package .pc files search order is as follows: // |