https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69402
Bug ID: 69402
Summary: Incorrect dependency generation when precompiled
headers are used
Product: gcc
Version: 4.8.5
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: hcma at hcma dot info
Target Milestone: ---
When a file depends on a pre-compiled header, gcc's dependency generation flags
(-M*) have a bug as it does not output the .gch file as a dependency despite
the documentation stating that it should:
https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html
The same is true for the man page information. For instance, in the compiler
version we are using (4.8.5) the documentation reads:
-fpch-deps
When using precompiled headers, this flag will cause the dependency-output
flags to
also list the files from the precompiled header's dependencies. If not
specified only
the precompiled header would be listed and not the files that were used to
create it
because those files are not consulted when a precompiled header is used.
Specifically, the text above says that "If not specified only the precompiled
header would be listed".
This problem has also been noted by others beyond myself, for instance:
https://bugs.openjdk.java.net/browse/JDK-7175914
