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| author | Bill Somerville <bill@classdesign.com> | 2015-07-29 17:36:38 +0100 |
|---|---|---|
| committer | Brad King <brad.king@kitware.com> | 2015-07-31 09:50:32 -0400 |
| commit | 5d0a8b1abc3f8a6d8d23772251b4ef2758d2def6 (patch) | |
| tree | 82509636512c869f3820297686fe3f815c2a64c4 /Modules/GetPrerequisites.cmake | |
| parent | afb674ab46a7d6ff3d1801315f3d852bdba79d0c (diff) | |
| download | cmake-5d0a8b1abc3f8a6d8d23772251b4ef2758d2def6.tar.gz | |
GetPrerequisites: Optionally filter "objdump" output for speed
As dumpbin.exe is no longer reliable for gcc libraries on MinGW because
it crashes on many common libraries like libgcc_s and libgfortran it is
now necessary too resort to using objdump for DLL dependency walking.
Using objdump has a secondary problem in that it generates a lot of
output for large libraries and causes fixup_bundle() to take many
minutes to process what took fractions of a second with
"dumpbin.exe /dependents".
Add a 'grep' pre-filter in the execute_process() command pipeline to
reduce this output to a minimum for a several orders of magnitude speed
up. If grep is not available just use the full output.
As there does not seem to be a reliable way of detecting MinGW, callers
of fixup_bundle() may have to set the variable gp_tool to "objdump" if
dumpbin.exe is installed on the build machine to stop it using the
broken MS dumpbin.exe for library dependency walking.
Diffstat (limited to 'Modules/GetPrerequisites.cmake')
| -rw-r--r-- | Modules/GetPrerequisites.cmake | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Modules/GetPrerequisites.cmake b/Modules/GetPrerequisites.cmake index a359d2c3af..e4018b670f 100644 --- a/Modules/GetPrerequisites.cmake +++ b/Modules/GetPrerequisites.cmake @@ -700,6 +700,8 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa return() endif() + set(gp_cmd_maybe_filter) # optional command to pre-filter gp_tool results + if(gp_tool STREQUAL "ldd") set(gp_cmd_args "") set(gp_regex "^[\t ]*[^\t ]+ => ([^\t\(]+) .*${eol_char}$") @@ -724,6 +726,11 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa set(gp_regex_error "") set(gp_regex_fallback "") set(gp_regex_cmp_count 1) + # objdump generaates copious output so we create a grep filter to pre-filter results + find_program(gp_grep_cmd grep) + if(gp_grep_cmd) + set(gp_cmd_maybe_filter COMMAND ${gp_grep_cmd} "^[[:blank:]]*DLL Name: ") + endif() else() message(STATUS "warning: gp_tool='${gp_tool}' is an unknown tool...") message(STATUS "CMake function get_prerequisites needs more code to handle '${gp_tool}'") @@ -780,6 +787,7 @@ function(get_prerequisites target prerequisites_var exclude_system recurse exepa # execute_process( COMMAND ${gp_cmd} ${gp_cmd_args} ${target} + ${gp_cmd_maybe_filter} RESULT_VARIABLE gp_rv OUTPUT_VARIABLE gp_cmd_ov ERROR_VARIABLE gp_ev |