[PATCH v2 10/23] contrib/buildsystems: redirect errors of the dry run into a log file

From: Philip Oakley via GitGitGadget <gitgitgadget@gmail.com>
Date: Jul 29, 2019, 20:08 UTC
Message-ID: <3cfbb7843ac3a27c79da4554cc550608b19f2d55.1564430879.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.287.v2.git.gitgitgadget@gmail.com>

From: Philip Oakley <philipoakley@iee.org>

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>
---
 contrib/buildsystems/engine.pl | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/contrib/buildsystems/engine.pl b/contrib/buildsystems/engine.pl
index 9db3d43a1e..de5c0b6b25 100755
--- a/contrib/buildsystems/engine.pl
+++ b/contrib/buildsystems/engine.pl
@@ -73,7 +73,12 @@ sub showUsage
 EOM
 
 # Pipe a make --dry-run into a variable, if not already loaded from file
-@makedry = `cd $git_dir && make -n MSVC=1 V=1 2>/dev/null` if !@makedry;
+# Capture the make dry stderr to file for review (will be empty for a release build).
+
+my $ErrsFile = "msvc-build-makedryerrors.txt";
+@makedry = `make -C $git_dir -n MSVC=1 V=1 2>$ErrsFile` if !@makedry;
+# test for an empty Errors file and remove it
+unlink $ErrsFile if -f -z $ErrsFile;
 
 # Parse the make output into usable info
 parseMakeOutput();

-- 
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