Added cross-compile targets for testing

Using gcc cross compilers and qemu:
- make test CC="arm-linux-gnueabi-gcc --static -mthumb" EXEC="qemu-arm"
- make test CC="powerpc-linux-gnu-gcc --static" EXEC="qemu-ppc"
- make test CC="mips-linux-gnu-gcc --static" EXEC="qemu-mips"

Also separated out Travis jobs and added some size reporting

.travis.yml

@@ -1,107 +1,210 @@
+# Environment variables
 env:
+  global:
     - CFLAGS=-Werror
 
+# Common test script
 script:
-    # make sure example can at least compile
-    - sed -n '/``` c/,/```/{/```/d; p;}' README.md > test.c &&
-      make all size CFLAGS+="
+  # make sure example can at least compile
+  - sed -n '/``` c/,/```/{/```/d; p;}' README.md > test.c &&
+    make all CFLAGS+="
         -Duser_provided_block_device_read=NULL
         -Duser_provided_block_device_prog=NULL
         -Duser_provided_block_device_erase=NULL
         -Duser_provided_block_device_sync=NULL
         -include stdio.h"
 
-    # run tests
-    - make test QUIET=1
+  # run tests
+  - make test QUIET=1
 
-    # run tests with a few different configurations
-    - make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=1      -DLFS_PROG_SIZE=1"
-    - make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=512    -DLFS_PROG_SIZE=512"
-    - make test QUIET=1 CFLAGS+="-DLFS_BLOCK_COUNT=1023 -DLFS_LOOKAHEAD=2048"
+  # run tests with a few different configurations
+  - make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=1      -DLFS_PROG_SIZE=1"
+  - make test QUIET=1 CFLAGS+="-DLFS_READ_SIZE=512    -DLFS_PROG_SIZE=512"
+  - make test QUIET=1 CFLAGS+="-DLFS_BLOCK_COUNT=1023 -DLFS_LOOKAHEAD=2048"
+
+  - make clean test QUIET=1 CFLAGS+="-DLFS_NO_INTRINSICS"
+
+  # compile and find the code size with the smalles configuration
+  - make clean size
+        OBJ="$(ls lfs*.o | tr '\n' ' ')"
+        CFLAGS+="-DLFS_NO{ASSERT,DEBUG,WARN,ERROR}"
+        | tee sizes
+
+  # update status if we succeeded, compare with master if possible
+  - |
+    if [ "$TRAVIS_TEST_RESULT" -eq 0 ]
+    then
+        CURR=$(tail -n1 sizes | awk '{print $1}')
+        STATUS="Passed, code size is ${CURR}B"
+
+        PREV=$(curl https://api.github.com/repos/$TRAVIS_REPO_SLUG/status/master \
+            | jq -r ".statuses[] | select(.context == \"ci/$NAME\").description" \
+            | sed 's/.*code size is \([0-9]*\).*/\1/' \
+            || echo 0)
+        if [ "$PREV" -ne 0 ]
+        then
+            STATUS="$STATUS ($(python -c "print '%+.2f' % (100*($CURR-$PREV)/$PREV.0)")%)"
+        fi
+    fi
+
+# CI matrix
+matrix:
+  include:
+    # native testing
+    - env:
+        - NAME=littlefs-x86
+
+    # cross-compile with ARM (thumb mode)
+    - env:
+        - NAME=littlefs-arm
+        - CC="arm-linux-gnueabi-gcc --static -mthumb"
+        - EXEC="qemu-arm"
+      install:
+        - sudo apt-get install gcc-arm-linux-gnueabi qemu-user
+        - arm-linux-gnueabi-gcc --version
+        - qemu-arm -version
+
+    # cross-compile with PowerPC
+    - env:
+        - NAME=littlefs-powerpc
+        - CC="powerpc-linux-gnu-gcc --static"
+        - EXEC="qemu-ppc"
+      install:
+        - sudo apt-get install gcc-powerpc-linux-gnu qemu-user
+        - powerpc-linux-gnu-gcc --version
+        - qemu-ppc -version
+
+    # cross-compile with MIPS
+    - env:
+        - NAME=littlefs-mips
+        - CC="mips-linux-gnu-gcc --static"
+        - EXEC="qemu-mips"
+      install:
+        - sudo add-apt-repository -y "deb http://archive.ubuntu.com/ubuntu/ xenial main universe"
+        - sudo apt-get -qq update
+        - sudo apt-get install gcc-mips-linux-gnu qemu-user
+        - mips-linux-gnu-gcc --version
+        - qemu-mips -version
 
     # self-host with littlefs-fuse for fuzz test
-    - make -C littlefs-fuse
+    - env:
+        - NAME=littlefs-fuse
+      install:
+        - sudo apt-get install libfuse-dev
+        - git clone --depth 1 https://github.com/geky/littlefs-fuse
+        - fusermount -V
+        - gcc --version
+      before_script:
+        # setup disk for littlefs-fuse
+        - rm -rf littlefs-fuse/littlefs/*
+        - cp -r $(git ls-tree --name-only HEAD) littlefs-fuse/littlefs
 
-    - littlefs-fuse/lfs --format /dev/loop0
-    - littlefs-fuse/lfs /dev/loop0 mount
+        - mkdir mount
+        - sudo chmod a+rw /dev/loop0
+        - dd if=/dev/zero bs=512 count=2048 of=disk
+        - losetup /dev/loop0 disk
+      script:
+        # self-host test
+        - make -C littlefs-fuse
 
-    - ls mount
-    - mkdir mount/littlefs
-    - cp -r $(git ls-tree --name-only HEAD) mount/littlefs
-    - cd mount/littlefs
-    - ls
-    - make -B test_dirs test_files QUIET=1
+        - littlefs-fuse/lfs --format /dev/loop0
+        - littlefs-fuse/lfs /dev/loop0 mount
 
+        - ls mount
+        - mkdir mount/littlefs
+        - cp -r $(git ls-tree --name-only HEAD) mount/littlefs
+        - cd mount/littlefs
+        - ls
+        - make -B test_dirs test_files QUIET=1
+
+# Manage statuses
 before_install:
-    - fusermount -V
-    - gcc --version
+  - |
+    curl -u $GEKY_BOT_STATUSES -X POST \
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
+        -d "{
+            \"context\": \"ci/$NAME\",
+            \"state\": \"pending\",
+            \"description\": \"${STATUS:-In progress}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
-install:
-    - sudo apt-get install libfuse-dev
-    - git clone --depth 1 https://github.com/geky/littlefs-fuse
+after_failure:
+  - |
+    curl -u $GEKY_BOT_STATUSES -X POST \
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
+        -d "{
+            \"context\": \"ci/$NAME\",
+            \"state\": \"failure\",
+            \"description\": \"${STATUS:-Failed}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
-before_script:
-    - rm -rf littlefs-fuse/littlefs/*
-    - cp -r $(git ls-tree --name-only HEAD) littlefs-fuse/littlefs
-
-    - mkdir mount
-    - sudo chmod a+rw /dev/loop0
-    - dd if=/dev/zero bs=512 count=2048 of=disk
-    - losetup /dev/loop0 disk
+after_success:
+  - |
+    curl -u $GEKY_BOT_STATUSES -X POST \
+        https://api.github.com/repos/$TRAVIS_REPO_SLUG/statuses/${TRAVIS_PULL_REQUEST_SHA:-$TRAVIS_COMMIT} \
+        -d "{
+            \"context\": \"ci/$NAME\",
+            \"state\": \"success\",
+            \"description\": \"${STATUS:-Passed}\",
+            \"target_url\": \"https://travis-ci.org/$TRAVIS_REPO_SLUG/jobs/$TRAVIS_JOB_ID\"
+        }"
 
+# Automatically update releases
 deploy:
-    # Let before_deploy take over
-    provider: script
-    script: 'true'
-    on:
-        branch: master
+  # Let before_deploy take over
+  provider: script
+  script: 'true'
+  on:
+    branch: master
 
 before_deploy:
-    - cd $TRAVIS_BUILD_DIR
-    # Update tag for version defined in lfs.h
-    - LFS_VERSION=$(grep -ox '#define LFS_VERSION .*' lfs.h | cut -d ' ' -f3)
-    - LFS_VERSION_MAJOR=$((0xffff & ($LFS_VERSION >> 16)))
-    - LFS_VERSION_MINOR=$((0xffff & ($LFS_VERSION >>  0)))
-    - LFS_VERSION="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR"
-    - echo "littlefs version $LFS_VERSION"
-    - |
-      curl -u $GEKY_BOT -X POST \
-        https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs \
-        -d "{
-          \"ref\": \"refs/tags/$LFS_VERSION\",
-          \"sha\": \"$TRAVIS_COMMIT\"
-        }"
-    - |
-      curl -f -u $GEKY_BOT -X PATCH \
-        https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs/tags/$LFS_VERSION \
-        -d "{
-          \"sha\": \"$TRAVIS_COMMIT\"
-        }"
-    # Create release notes from commits
-    - LFS_PREV_VERSION="v$LFS_VERSION_MAJOR.$(($LFS_VERSION_MINOR-1))"
-    - |
-      if [ $(git tag -l "$LFS_PREV_VERSION") ]
-      then
-        curl -u $GEKY_BOT -X POST \
-            https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases \
-            -d "{
-                \"tag_name\": \"$LFS_VERSION\",
-                \"name\": \"$LFS_VERSION\"
-            }"
-        RELEASE=$(
-            curl -f https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/tags/$LFS_VERSION
-        )
-        CHANGES=$(
-            git log --oneline $LFS_PREV_VERSION.. --grep='^Merge' --invert-grep
-        )
-        curl -f -u $GEKY_BOT -X PATCH \
-            https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/$(
-                jq -r '.id' <<< "$RELEASE"
-            ) \
-            -d "$(
-                jq -s '{
-                    "body": ((.[0] // "" | sub("(?<=\n)#+ Changes.*"; ""; "mi"))
-                        + "### Changes\n\n" + .[1])
-                }' <(jq '.body' <<< "$RELEASE") <(jq -sR '.' <<< "$CHANGES")
-            )"
-      fi
+  - cd $TRAVIS_BUILD_DIR
+  # Update tag for version defined in lfs.h
+  - LFS_VERSION=$(grep -ox '#define LFS_VERSION .*' lfs.h | cut -d ' ' -f3)
+  - LFS_VERSION_MAJOR=$((0xffff & ($LFS_VERSION >> 16)))
+  - LFS_VERSION_MINOR=$((0xffff & ($LFS_VERSION >>  0)))
+  - LFS_VERSION="v$LFS_VERSION_MAJOR.$LFS_VERSION_MINOR"
+  - echo "littlefs version $LFS_VERSION"
+  - |
+    curl -u $GEKY_BOT_RELEASES -X POST \
+      https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs \
+      -d "{
+        \"ref\": \"refs/tags/$LFS_VERSION\",
+        \"sha\": \"$TRAVIS_COMMIT\"
+      }"
+  - |
+    curl -f -u $GEKY_BOT_RELEASES -X PATCH \
+      https://api.github.com/repos/$TRAVIS_REPO_SLUG/git/refs/tags/$LFS_VERSION \
+      -d "{
+        \"sha\": \"$TRAVIS_COMMIT\"
+      }"
+  # Create release notes from commits
+  - LFS_PREV_VERSION="v$LFS_VERSION_MAJOR.$(($LFS_VERSION_MINOR-1))"
+  - |
+    if [ $(git tag -l "$LFS_PREV_VERSION") ]
+    then
+      curl -u $GEKY_BOT_RELEASES -X POST \
+          https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases \
+          -d "{
+              \"tag_name\": \"$LFS_VERSION\",
+              \"name\": \"$LFS_VERSION\"
+          }"
+      RELEASE=$(
+          curl -f https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/tags/$LFS_VERSION
+      )
+      CHANGES=$(
+          git log --oneline $LFS_PREV_VERSION.. --grep='^Merge' --invert-grep
+      )
+      curl -f -u $GEKY_BOT_RELEASES -X PATCH \
+          https://api.github.com/repos/$TRAVIS_REPO_SLUG/releases/$(
+              jq -r '.id' <<< "$RELEASE"
+          ) \
+          -d "$(
+              jq -s '{
+                  "body": ((.[0] // "" | sub("(?<=\n)#+ Changes.*"; ""; "mi"))
+                      + "### Changes\n\n" + .[1])
+              }' <(jq '.body' <<< "$RELEASE") <(jq -sR '.' <<< "$CHANGES")
+          )"
+    fi

Makefile

@@ -1,8 +1,8 @@
 TARGET = lfs
 
-CC = gcc
-AR = ar
-SIZE = size
+CC ?= gcc
+AR ?= ar
+SIZE ?= size
 
 SRC += $(wildcard *.c emubd/*.c)
 OBJ := $(SRC:.c=.o)

tests/test.py

@@ -33,10 +33,15 @@ def generate(test):
         pass
 
 def compile():
-    subprocess.check_call(['make', '--no-print-directory', '-s'])
+    subprocess.check_call([
+            os.environ.get('MAKE', 'make'),
+            '--no-print-directory', '-s'])
 
 def execute():
-    subprocess.check_call(["./lfs"])
+    if 'EXEC' in os.environ:
+        subprocess.check_call([os.environ['EXEC'], "./lfs"])
+    else:
+        subprocess.check_call(["./lfs"])
 
 def main(test=None):
     if test and not test.startswith('-'):