contrib/buildsystems: redirect errors of the dry run into a log file

Rather than swallowing the errors, it is better to have them in a file. To make it obvious what this is about, use the file name 'msvc-build-makedryerrors.txt'. Further, if the output is empty, simply delete that file. As we target Git for Windows' SDK (which, unlike its predecessor msysGit, offers Perl versions newer than 5.8), we can use the quite readable syntax `if -f -z $ErrsFile` (available in Perl >=5.10). Note that the file will contain the new values of the GIT_VERSION and GITGUI_VERSION if they were generated by the make file. They are omitted if the release is tagged and indentically defined in their respective GIT_VERSION_GEN file DEF_VER variables. Signed-off-by: Philip Oakley <philipoakley@iee.org> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Philip Oakley committed Jul 29, 2019 at 13:08 UTC 03aa7118c3a11e96ba04c839e7378cc321ed2fbf
1 file changed +6 -1
contrib/buildsystems/engine.pl
+6 -1
@@ -73,7 +73,12 @@ Running GNU Make to figure out build structure...
73 EOM
74
75 # Pipe a make --dry-run into a variable, if not already loaded from file
76 -@makedry = `cd $git_dir && make -n MSVC=1 V=1 2>/dev/null` if !@makedry;
76 +# Capture the make dry stderr to file for review (will be empty for a release build).
77 +
78 +my $ErrsFile = "msvc-build-makedryerrors.txt";
79 +@makedry = `make -C $git_dir -n MSVC=1 V=1 2>$ErrsFile` if !@makedry;
80 +# test for an empty Errors file and remove it
81 +unlink $ErrsFile if -f -z $ErrsFile;
82
83 # Parse the make output into usable info
84 parseMakeOutput();