[5/5] travis-ci: build with the right compiler
diff mbox series

Message ID 20181220162452.17732-6-szeder.dev@gmail.com
State New
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Series
  • travis-ci: build with the right compiler
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Commit Message

SZEDER Gábor Dec. 20, 2018, 4:24 p.m. UTC
Our 'Makefile' hardcodes the compiler to build Git as 'CC = cc'.  This
can be overridden from the command line, i.e. 'make CC=gcc-X.Y' will
build with that particular GCC version, but not from the environment,
i.e. 'CC=gcc-X.Y make' will still build with whatever 'cc' happens to
be on the platform.

Our build jobs on Travis CI are badly affected by this.  In the build
matrix we have dedicated build jobs to build Git with GCC and Clang
both on Linux and macOS from the very beginning (522354d70f (Add
Travis CI support, 2015-11-27)).  Alas, this never really worked as
supposed to, because Travis CI specifies the compiler for those build
jobs as 'export CC=gcc' and 'export CC=clang' (which works fine for
projects built with './configure && make').  Consequently, our
'linux-clang' build job has always used GCC, because that's where 'cc'
points at in Travis CI's Linux images, while the 'osx-gcc' build job
has always used Clang.  Furthermore, 37fa4b3c78 (travis-ci: run gcc-8
on linux-gcc jobs, 2018-05-19) added an 'export CC=gcc-8' in an
attempt to build with a more modern compiler, but to no avail.

Set MAKEFLAGS with CC based on the $CC environment variable, so 'make'
will run the "right" compiler.  The Xcode 10.1 macOS image on Travis
CI already contains the gcc@8 package from Homebrew, but we have to
'brew link' it first to be able to use it.

So with this patch our build jobs will build Git with the following
compiler versions:

  linux-clang: clang version 5.0.0 (tags/RELEASE_500/final)
  linux-gcc:   gcc-8 (Ubuntu 8.1.0-5ubuntu1~14.04) 8.1.0

  osx-clang: Apple LLVM version 10.0.0 (clang-1000.11.45.5)
  osx-gcc:   gcc-8 (Homebrew GCC 8.2.0) 8.2.0

  GETTEXT_POISON: gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
---
 ci/install-dependencies.sh |  5 +++++
 ci/lib-travisci.sh         | 15 ++++++++++++---
 2 files changed, 17 insertions(+), 3 deletions(-)

Comments

Johannes Schindelin Jan. 3, 2019, 4:01 p.m. UTC | #1
Hi Gábor,

On Thu, 20 Dec 2018, SZEDER Gábor wrote:

> Our 'Makefile' hardcodes the compiler to build Git as 'CC = cc'.  This

... This CC variable ...

> can be overridden from the command line, i.e. 'make CC=gcc-X.Y' will
> build with that particular GCC version, but not from the environment,
> i.e. 'CC=gcc-X.Y make' will still build with whatever 'cc' happens to
> be on the platform.

Without this edit, it read to me as if the commit message claimed that
CC cannot be overridden via the environment *at all*, even with MAKEFLAGS.

The rest of the entire patch series looks good to me, I did not dig as
deeply as Ævar about that obstack patch, but if there is *some* sort of
upstream from where we can get a fix, I think we should try to go for that
(rather than risking to diverge even further).

Thanks,
Dscho

> 
> Our build jobs on Travis CI are badly affected by this.  In the build
> matrix we have dedicated build jobs to build Git with GCC and Clang
> both on Linux and macOS from the very beginning (522354d70f (Add
> Travis CI support, 2015-11-27)).  Alas, this never really worked as
> supposed to, because Travis CI specifies the compiler for those build
> jobs as 'export CC=gcc' and 'export CC=clang' (which works fine for
> projects built with './configure && make').  Consequently, our
> 'linux-clang' build job has always used GCC, because that's where 'cc'
> points at in Travis CI's Linux images, while the 'osx-gcc' build job
> has always used Clang.  Furthermore, 37fa4b3c78 (travis-ci: run gcc-8
> on linux-gcc jobs, 2018-05-19) added an 'export CC=gcc-8' in an
> attempt to build with a more modern compiler, but to no avail.
> 
> Set MAKEFLAGS with CC based on the $CC environment variable, so 'make'
> will run the "right" compiler.  The Xcode 10.1 macOS image on Travis
> CI already contains the gcc@8 package from Homebrew, but we have to
> 'brew link' it first to be able to use it.
> 
> So with this patch our build jobs will build Git with the following
> compiler versions:
> 
>   linux-clang: clang version 5.0.0 (tags/RELEASE_500/final)
>   linux-gcc:   gcc-8 (Ubuntu 8.1.0-5ubuntu1~14.04) 8.1.0
> 
>   osx-clang: Apple LLVM version 10.0.0 (clang-1000.11.45.5)
>   osx-gcc:   gcc-8 (Homebrew GCC 8.2.0) 8.2.0
> 
>   GETTEXT_POISON: gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
> 
> Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
> ---
>  ci/install-dependencies.sh |  5 +++++
>  ci/lib-travisci.sh         | 15 ++++++++++++---
>  2 files changed, 17 insertions(+), 3 deletions(-)
> 
> diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
> index 06c3546e1e..dc719876bb 100755
> --- a/ci/install-dependencies.sh
> +++ b/ci/install-dependencies.sh
> @@ -40,6 +40,11 @@ osx-clang|osx-gcc)
>  	brew install git-lfs gettext
>  	brew link --force gettext
>  	brew install caskroom/cask/perforce
> +	case "$jobname" in
> +	osx-gcc)
> +		brew link gcc@8
> +		;;
> +	esac
>  	;;
>  StaticAnalysis)
>  	sudo apt-get -q update
> diff --git a/ci/lib-travisci.sh b/ci/lib-travisci.sh
> index 69dff4d1ec..a479613a57 100755
> --- a/ci/lib-travisci.sh
> +++ b/ci/lib-travisci.sh
> @@ -99,12 +99,14 @@ export DEFAULT_TEST_TARGET=prove
>  export GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
>  export GIT_TEST_OPTS="--verbose-log -x --immediate"
>  export GIT_TEST_CLONE_2GB=YesPlease
> -if [ "$jobname" = linux-gcc ]; then
> -	export CC=gcc-8
> -fi
>  
>  case "$jobname" in
>  linux-clang|linux-gcc)
> +	if [ "$jobname" = linux-gcc ]
> +	then
> +		export CC=gcc-8
> +	fi
> +
>  	export GIT_TEST_HTTPD=YesPlease
>  
>  	# The Linux build installs the defined dependency versions below.
> @@ -118,6 +120,11 @@ linux-clang|linux-gcc)
>  	export PATH="$GIT_LFS_PATH:$P4_PATH:$PATH"
>  	;;
>  osx-clang|osx-gcc)
> +	if [ "$jobname" = osx-gcc ]
> +	then
> +		export CC=gcc-8
> +	fi
> +
>  	# t9810 occasionally fails on Travis CI OS X
>  	# t9816 occasionally fails with "TAP out of sequence errors" on
>  	# Travis CI OS X
> @@ -127,3 +134,5 @@ GIT_TEST_GETTEXT_POISON)
>  	export GIT_TEST_GETTEXT_POISON=YesPlease
>  	;;
>  esac
> +
> +export MAKEFLAGS="CC=${CC:-cc}"
> -- 
> 2.20.1.151.gec613c4b75
> 
>

Patch
diff mbox series

diff --git a/ci/install-dependencies.sh b/ci/install-dependencies.sh
index 06c3546e1e..dc719876bb 100755
--- a/ci/install-dependencies.sh
+++ b/ci/install-dependencies.sh
@@ -40,6 +40,11 @@  osx-clang|osx-gcc)
 	brew install git-lfs gettext
 	brew link --force gettext
 	brew install caskroom/cask/perforce
+	case "$jobname" in
+	osx-gcc)
+		brew link gcc@8
+		;;
+	esac
 	;;
 StaticAnalysis)
 	sudo apt-get -q update
diff --git a/ci/lib-travisci.sh b/ci/lib-travisci.sh
index 69dff4d1ec..a479613a57 100755
--- a/ci/lib-travisci.sh
+++ b/ci/lib-travisci.sh
@@ -99,12 +99,14 @@  export DEFAULT_TEST_TARGET=prove
 export GIT_PROVE_OPTS="--timer --jobs 3 --state=failed,slow,save"
 export GIT_TEST_OPTS="--verbose-log -x --immediate"
 export GIT_TEST_CLONE_2GB=YesPlease
-if [ "$jobname" = linux-gcc ]; then
-	export CC=gcc-8
-fi
 
 case "$jobname" in
 linux-clang|linux-gcc)
+	if [ "$jobname" = linux-gcc ]
+	then
+		export CC=gcc-8
+	fi
+
 	export GIT_TEST_HTTPD=YesPlease
 
 	# The Linux build installs the defined dependency versions below.
@@ -118,6 +120,11 @@  linux-clang|linux-gcc)
 	export PATH="$GIT_LFS_PATH:$P4_PATH:$PATH"
 	;;
 osx-clang|osx-gcc)
+	if [ "$jobname" = osx-gcc ]
+	then
+		export CC=gcc-8
+	fi
+
 	# t9810 occasionally fails on Travis CI OS X
 	# t9816 occasionally fails with "TAP out of sequence errors" on
 	# Travis CI OS X
@@ -127,3 +134,5 @@  GIT_TEST_GETTEXT_POISON)
 	export GIT_TEST_GETTEXT_POISON=YesPlease
 	;;
 esac
+
+export MAKEFLAGS="CC=${CC:-cc}"