diff options
| author | Orgad Shaneh <orgad.shaneh@audiocodes.com> | 2018-01-02 19:07:03 +0200 |
|---|---|---|
| committer | Orgad Shaneh <orgads@gmail.com> | 2018-01-08 15:02:21 +0000 |
| commit | af1a179cc8b599523ca858b1b9f55c93a734d047 (patch) | |
| tree | 4639ebfd7ec5e43d76beff704fa18a18d1ff428f /qmake/doc/src | |
| parent | 3e58f2b090661aab7302132cb2da661c8e227bc2 (diff) | |
qmake: Introduce precompile_header_c for MSVC
MSVC requires that the C PCH file is compiled (as an object) and linked if
any C file is found, and the same for C++.
Most qmake projects are C++.
If a C++ project has a precompiled header, it is typically of C++ type, and
cannot be compiled as C (for example, it contains or includes classes).
Since there is no easy way to conditionally build the C PCH file only if C
files are found in the project (as done for g++), we need a setting that is
disabled by default.
This amends 30331afda118.
[ChangeLog][Tools][qmake] Introduced precompile_header_c CONFIG option for
MSVC to enable precompiled header for C sources.
Task-number: QTBUG-65103
Change-Id: Id9688a35ee7d9b5e4f5a846b81986cb674bc5f4e
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Diffstat (limited to 'qmake/doc/src')
| -rw-r--r-- | qmake/doc/src/qmake-manual.qdoc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/qmake/doc/src/qmake-manual.qdoc b/qmake/doc/src/qmake-manual.qdoc index 58c51502b0..16b498d36e 100644 --- a/qmake/doc/src/qmake-manual.qdoc +++ b/qmake/doc/src/qmake-manual.qdoc @@ -939,6 +939,8 @@ order in which they are given. \row \li precompile_header \li Enables support for the use of \l{Using Precompiled Headers}{precompiled headers} in projects. + \row \li precompile_header_c (MSVC only) \li Enables support for the use of + \l{Using Precompiled Headers}{precompiled headers} for C files. \row \li warn_on \li The compiler should output as many warnings as possible. If \c warn_off is also specified, the last one takes effect. \row \li warn_off \li The compiler should output as few warnings as possible. @@ -4623,6 +4625,11 @@ \snippet code/doc_src_qmake-manual.pro 106 + To use the precompiled header also for C files on MSVC nmake target, add + \c precompile_header_c to the \l{CONFIG} variable. If the header is + used also for C++ and it contains C++ keywords/includes, enclose them + with \c{#ifdef __cplusplus}). + \section1 Notes on Possible Issues On some platforms, the file name suffix for precompiled header files is |